How do I contact Strebel’s sales team?

For sales enquiry’s please either contact the office via:
Telephone: 01276 861 350, Option 1
Fax: 01276 685405
Alternatively, you may wish to contact your area manager who will be able to assist in gathering the information you require.

What does your warranty cover?

Our warranty terms can be found in the Terms & Conditions which we can issue upon request.

Warranty Returns

Warranty parts are charged to our customers until the failed parts are returned for inspection, back to our head office. Once an inspection and/or report have been carried out (this may involve Strebel returning the goods to our works) the item will be booked into our warehouse. Any credit which is applicable can then be issued to our customer.

It is imperative that the returned goods are accompanied with information regarding the initial supply of the items.

In order to speed up the process we provide warranty returns labels. These should be adhered to the faulty part with the relevant details completed. Without the information on the parts, we CANNOT issue credits under warranty as this information is also required by our works warranty conditions.

Contract numbers are the most important piece of information that MUST be filled in. The Contract Number can be found on the Advice/Delivery note that the replacement parts are sent with.

As part of our ongoing R & D, we also monitor the returned components, with a view to continually making developments to eliminate any fault which occurs on a frequent basis. With this in mind we ask that a description of the fault is given, i.e the sequence of events which occurred prior to the part being identified as “faulty”. This will help to resolve the more common minor faults and develop the components’ design to overcome the problems.

Strebel Ltd have a product specific warranty term for all items supplied by the company. Please contact our head office on
01276 861 350 to see what warranty term you are entitled to on your equipment.

Warranty Call Outs

In the event that you should need a site visit or call out, Strebel will treat you as a matter of priority to attend site to rectify or remedy any warranty issues.

Should it be found that the cause of the boiler/burner failure is due to a non warranty issue, a cost will be made chargeable to the supplied purchase order, which we ask to be provided prior to attendance. In the event that a further visit is required due to lack of information on the fault, additional charges may be levied.

What time is the cut – off to ensure next working day delivery?

We ask our customers to send their order to Strebel before 14:00 hours to ensure next working day delivery on stock items. We recommend customers to contact us prior to placing an order to ensure next day delivery can be carried out.

How can I open an account with Strebel?

We always ask for written instruction when an account is to be opened with Strebel Ltd. You can send this via:
Fax: 01276 685405
Email: info@strebel.co.uk
Alternatively, you may wish to contact us via telephone to discuss your requirements:
Telephone: 01276 861 350 Option 6

How can I get information such as technical data, dimensions and advice for Strebel products?

Please feel free to browse our website as product information can be accessed via the product navigation menus and referenced through each product family.
If the information you require is not listed, please feel free to contact a member of our technical support team via:

Telephone: 01276 861 350, Option 2
Fax: 01276 685405
Email: peter.spurway@strebel.co.uk, james.young@strebel.co.uk, info@strebel.co.uk

Alternatively, you may wish to contact your area manager who will be able to assist in gathering the information you require.

Who do I need to contact to arrange a service or commissioning request?

We always ask for written instruction for both of these services. You can send this via:
Fax: 01276 685405
Email: info@strebel.co.uk, donna.brown@strebel.co.uk, james.young@strebel.co.uk, peter.spurway@strebel.co.uk.
Alternatively, you may wish to contact us via telephone to discuss your requirements on 01276 861 350 and select Option 4.

Which boiler should I choose?

Our extensive range of boilers we are able to supply can be easily narrowed down to find the correct solution for you. Our product ranges can be found via the products menu at the top, but if you woould like to discuss your requirements in more detail, you may wish to contact your area manager who will be able to assist in gathering the information you require.

I need my boiler erected & pressure tested

We ask for written instruction with requests for our boiler erection & pressure testing Services. This work is undertaken on behalf of Strebel Ltd by our approved mechanical engineers.
You can send this via:
Fax: 01276 695405
Email: info@strebel.co.uk
Alternatively, you may wish to contact us via telephone to discuss your requirements on 01276 861 350.

Where can I obtain spare parts for my boiler?

Strebel spares can be purchased through most of the major merchants in the UK. If you have an account with Strebel or require part numbers for items you can find this information via:
Telephone: 01276 861 350, Option 2 or 3
Fax: 01276 695405
Email: info@strebel.co.uk
Alternatively, you may wish to contact your area manager, who will be able to assist in gathering the information you require.

How do I know if my boiler is underperforming?

A well maintained boiler and hot water/heating system will not only extend longevity of the components your system is made up of, but also ensure safe and efficient running of the plant.
Typical signs of a boiler underperforming may be down to high fuel consumption or prolonged warm up times.
Boilers that are well-maintained can last as long as 30 years. However, the life of a boiler can be severely shortened by poor maintenance.
If you require technical assistance or a Site visit from one of our highly trained engineers, whether it be a service or call out request, you may wish to contact us via telephone to discuss your requirements on: 01276 861 350 Option 2 or 4

The boiler display is blank?
  • Check power Supply
  • Check all fuses are intact
  • Check the operation of the pump
  • Check the ribbon Cable between Main PCB & Display PCB

If in doubt contact Strebel.

How do condensing boilers work?

This is a design of boiler which can have an increased efficiency over the more traditional boiler. The efficiency of a typical non-condensing boiler is around 75%, whereas with condensing boilers it can be over 87%. This increased efficiency is due to the extraction of heat from the otherwise wasted flue gases. Condensing boilers are designed to reduce the flue gas temperature to as low as 55°C. This reduction of temperature causes the water vapour (formed during the combustion process) to condense and, as the droplets of water form, fall by gravity to collect at the base of the flue manifold. The remaining gases are expelled to the outside environment through a fan-assisted balanced flue. The condensation produced within the appliance should be drained as necessary into the waste discharge pipework or externally into a purpose-made soakaway.

When should I get my boiler serviced?

It is vital that you get your boiler and associated appliances inspected and serviced regularly to make sure they are working as safely and efficiently as possible.
For your boiler to work Safely & Economically, all boiler manufacturers recommend that the Appliance is serviced each year by a competent person (EG. Gas Safe Registered).

Gas fired = One service per annum.
Oil fired = One service per annum.
Biomass = One service every 6 months

The boiler has a ‘F-‘ Code on its display

An error has been detected and is indicated on the display by this lock out code. This is a permanent lock which can only be removed by pressing the ‘Reset’ button.
The most common ‘F-‘ codes are:

  • ‘F0’ Short circuit on ionisation probe
  • ‘F2’ High limit thermostat
  • ‘F4’ Fan speed incorrect
  • ‘F5’ No flame after 5 ignition attempts
  • ‘F6’ Flame lift off during heat demand

If the fault is recurring, refer to our Installation and User manual for reference to Error Messages. If in doubt contact Strebel.

Do I need to use an outside sensor to use with my S-CB Boiler?

The use of a Strebel outside sensor is completely optional.
When an outside temperature sensor is connected, the boiler will control the flow water temperature by using a calculation which is relative to the outside temperature. No parameter change is needed and the sensor can simply be wired in to the boiler electrical connections

Does the boiler have a 0-10v input?

The Strebel S-CB can be controlled optionally by a 0-10V DC signal. Through the 0-10V DC control connection based on temperature (parameter change required), the boiler can easily be set and used within Building Management Systems (BMS).

Will a pump be supplied when I place an order for my S-CB boiler?

The S-CB is equipped with an internal boiler pump. This is designed as a circulator between the Boiler and the Low loss header only. A system pump will need to be installed on the system side of the Low Loss Header to distribute the water to the heating/hot water circuits.

Which inhibitor do Strebel recommend?

Strebel recommends the use of Sentinel X100 (only) additive to the water for the central heating. The pH value should be between 8.2 and 9.5 (if not, we suggest you contact Strebel). Test the water. Use additive as required. Hardness should be 5 to15 degree F (French).

What flue recommendations do Strebel make for the S-CB Condensing Boiler range?

Guidance should always be sought from Strebel S-CB Installation, Operating & Maintenance Manual. This should be used in conjunction with current regulations and conform to the clean air act.
Some extracts from the manual can be found below:

  • The SCB Boiler has a fan pressure capable of overcoming 200pa of Flue resistance and Air inlet resistance both added together.
  • When using multiple SCB Boilers on a common flue, the flue should be in negative pressure, if not contact Strebel. Compulsory use of the electronic cascade system is required when using a pressurised common flue.
    NOTE: separate flues provide the most efficient operation on any multiple boiler system.
  • SCB Boilers 60kw to 120kw use a co-axial flue as standard – Twin pipe flue utilises an adaptor at extra cost
  • Boilers 150 to 180kW use parallel, Twin pipe flues.
  • All Boilers can be used in a room sealed application or, if the boiler room or fitting space complies with the relevant ventilation requirements, boilers can be non room sealed i.e. exhaust only, providing ventilation complies with current regulations.
  • Install horizontal exhaust Flue parts with at least 5.2% fall in the direction of the boiler ( more than 5 centimetre for every linear metre)

GUIDANCE SHOULD ALWAYS BE SOUGHT FROM THE MANUAL

Do Strebel recommend the use of a low loss header when installing an S-CB?

The use of a Hydraulic Low Loss Header and an Air & Dirt Separator with the S-CB Boiler range is required.
Alternatively, a Boiler Guard may be used (Combined LLH and Air & Dirt Seperator).

Low loss headers are used to allow flow, even when all system valves are closed.

Please take a look at our accessories section for a comprehensive full range of Low Loss headers and Boiler Guards supplied by Strebel.

The boiler has a ‘E—‘ Code on its display

An error has been detected and is indicated on the display by this lock out code. This is a permanent lock which can only be removed by pressing the ‘Reset’ button.
The most common ‘E—‘ Codes are:

  • ‘E00’ Incorrect flame formation (ionisation fault)
  • ‘E02’ No flame formation
  • ‘E03’ Gas valve or air box temperature stat
  • ‘E28’ No signal from the fan
  • ‘E31’ Shut down of flow sensor (T1)
  • ‘E32’ Shut down of return sensor (T2)
  • ‘E36’ Contact for flow sensor (T1) open

If the fault is recurring, refer to our Installation and User manual for reference to Error Messages. If in doubt contact Strebel.

I have replaced an MCBA Control Centre and the display shows ‘d—A’

When replacing the main MCBA Control Unit, the new component will be supplied with no parameters within its software. It is easy to programme the new MCBA as there is always a stored ‘back up’ of the parameters on the display board of the boiler.
If ‘d—a’ is displayed, simply press and hold the ‘Store’ button. Whilst your finger is depressed, the display will change to ‘Copy’. The parameters will load on to the display and the display will revert to ‘STBY’ or ‘GOOD’

The boiler has a ‘BL—‘ Code on its display

An error has been detected and is indicated on the display by this block message. Blocks can be temporary and the controller will do everything possible to prevent a system block. The appliance may return to normal operation in cases such as when sensors return to their normal temperature. The most common ‘BL—‘ codes are:
‘BL01’ External Safety Contact (Terminals 24 & 25)
‘BL11’ Maximum average ΔT between Flow/Return (CH)
‘BL12’ Maximum average ΔT between Flow/Return (HW)
‘BL85’ Lack of water flow detected by the controller (Pump, water filter blocked, water pressure sensor faulty)
If the fault is recurring, refer to our Installation and User manual for reference to Block Messages.

If in doubt contact Strebel.

The boiler has stopped but there is no flashing indication.

The boiler has displayed a Blocking Code. This is usually because an incorrect reading has occurred on one or more of the boiler components. If the fault is recurring, refer to our Installation and User manual for reference to fault causes. If in doubt contact Strebel.

The boiler keeps flashing an ‘A’ code

The ‘A’ code denotes when the appliance(s) is going through its automatic venting sequence or otherwise known as de-aeration cycle. The appliance will do this when the electrical supply is isolated then reinstated. It will also do this after re-pressurisation and after a fault has been cleared. The ‘A’ code will last for approximately 18 minutes and during this period will check flow through the boiler, including the pump and water pressure sensor; but during this period no ignition will take place.

Can I skip the ‘A’ code?

There is a sequence to skip the ‘A’ code but please be aware we advise you to let the appliance run its de-aeration cycle on initial filling and after re-pressuring. Hold ‘Mode’ button > Display will change to ‘CODE’ > Using ‘+’ or ‘–‘ button scroll to code ‘C123’ > Press and hold ‘Store’ button until display flashes then release > Press the ‘Mode’ button once only > The word ‘PARA’ should be visible > Now press the ‘Reset’ button > The boiler will then restart, go through its sequence and normal operation should resume.

What controls options are available for the S-HQ range?

Strebel can supply a range of controls from single domestic combination boilers up to multiple boiler installations with zone controls for the large domestic and commercial applications.
One example of controller to compliment your Strebel S-HQ boiler is the BrainQ programmable room thermostat. The BrainQ is both self supporting and self-learning, meaning you can use it optimally and not interfere manually. In addition to regulating your central heating and hot water the BrainQ’s display gives you all the information you need on the fuctioning and status of your S-HQ boiler unit. The BrainQ can activate various special features, such as the holiday programme, that ensures a warm, cosy house on your return.

Further to this, the BrainQ is able to work in combination with the various controls packages Strebel supply for multi-zone application and also our Cascade control option packages.
One example of this type of controller is the Strebel MADQ Cascade and Zone controller. This unit can be wall mounted or inserted into the boiler’s front panel. As a Cascade Controller the unit incorporates individual boiler control and automatic boiler switching for up to eight boilers. As a Zone Controller the unit can operate up to 5 separate zones each with their own different individual time, temperature and heating curve settings. The operation is controlled by simple rotary push button technology.

There are several packages available for both cascade system and for separate zone control packages including an additional Strebel 0-10 volt controller which will enable the appliances to be BMS system compatible.
Contact us today and will be happy to advise you on what is the best controls option for proposed plant layout.

There is a flashing indication on the boiler.

The boiler is in Lock Out. Refer to our Installation and User manual for reference to fault codes. If in doubt contact Strebel.

Will I require a low loss header with my S-HQ boiler?

A low velocity header must be connected to the Q51C, Q51S and Q60S models to prevent flow problems over the boiler.
When ordered, STREBEL supplies the AA1OV09U Low velocity header for 1 boiler. This can be connected directly under the boiler between on the flow and return pipework. Others sizes of Low Loss Header are available and can be found in our accessories section.

Can the Strebel S-HQ boiler be used as a fully weather compensated and optimised unit?

The use of a Strebel outside sensor and optimisation is completely optional and you will be asked if there is a control option which you require when placing your order.
One particular option which is available can be found below:
Strebel S-HQ Single boiler Control Option 1:
For a single boiler installation, doing a single heating circuit which is to be fully weather compensated and optimised =
1 x AW1BQ05U STREBEL Programmable BrainQ RSC/2 Controller
1 x ARV1215U STREBEL Outside Sensor

The boiler status shows a small ‘c’ when it usually displays a large symbol and a full stop ‘C.’

Central heating pump post running sequence is in operation (pump overrun) to dissipate the heat from the appliance until the next firing period. Note : Maximum average ΔT between Flow/Return = 45˚C.

The boiler ‘status’ permanently states ‘P’?

Low water pressure. Check system pressure and heating demand.

The boiler is off. What should I be looking to check before I Request a call out?
  • Check correct Settings of heating circuit controls.
  • Main switch is turned on and other controls are calling for heat.
  • If automatic control does not operate, i.e. is faulty, switch off “Control” switch and regulate via “Manual” control.
  • Burner indicates malfunction, press reset button. Refer to the burner manufacturer’s instructions.
  • All switches and knobs on the controls are set accordingly?
  • Is the fuse intact?
  • Is the plug for general power supply plugged in?
  • Is the Burner plug correctly plugged in?
  • Heating pump and primary circulating pump operating?
  • All valves are open?
  • Last and by no means least…..Make sure Fuel is available!
What should I set the boiler temperature to?

This will ultimately depend on the system to which the boilers are serving. None the less, Strebel boilers are operated with low flue-gas temperatures in order to achieve maximum efficiency. But, If the boiler water or return temperatures are too low, there is also danger that heating surfaces will become fouled and encrusted. This results in higher flue gas temperatures, making boiler cleaning difficult, and in extreme cases can irreparable damage to sections.

The following conditions are recommendation only:
Oil fired:
Boiler water temperature min: 60ºC
Return water temperature min: 50ºC

Gas fired
Boiler water temperature min: 70ºC
Return water temperature min: 60ºC

I have ordered a replacement control thermostat for my Ru/Ca boiler, but the new thermostat is different to the old type?

With the Ru & Ca range of boilers, Strebel now only supply one type of thermostat for these appliances. The older type thermostats are now obsolete, so the engineer will either need to retro fit and alter the control panel to suit the new type thermostat, or alternatively replace the old control panel to a new type (K2B/B2B).

What are the recommendations for back end temperature maintenance?

Please see PDF below for our recommended back end temperature layout for Strebel Ru/Ca/CIS range of boilers.

My boiler is overheating and the high limit stat constantly needs to be reset?

One, or both control thermostats on the boiler control panel should be checked. It may also be worthwhile checking the capillary to make sure it has not been removed from its phial. If the fault is recurring, refer to our Operating and Maintenance manual for reference to Faults. If in doubt contact Strebel.

I need to find dimensions and the recommended clearances round the boiler?

We ask that you refer to the appropriate Installation or Operating & Maintenance manual for reference on dimensions as this will ultimately depend on which model of boiler you require the information for.
Please feel free to browse our website as product information can be accessed via the drop down menus and referenced through each product family.
If the information you require is not listed, please feel free to contact a member of our technical support team via:

Telephone: 01276 861 350 Option 2
Fax: 01276 685405
Email: peter.spurway@strebel.co.uk, james.young@strebel.co.uk, info@strebel.co.uk

I need my boiler erected & pressure tested

We ask for written instruction with requests for our boiler erection & pressure testing Services which are undertaken on behalf of Strebel Ltd. You can send this via:
Fax: 01276 695405
Email: info@strebel.co.uk
Alternatively, you may wish to contact us via telephone to discuss your requirements on: 01276 861 350

What test hydraulic test pressure do Strebel specify?

After filling the boiler, Strebel recommend applying a hydraulic pressure test equal to 1.5 times the specified working pressure. The test duration shall be for a minimum of 1 hour.

Do I need to use an outside sensor to use with my SC Boiler?

The use of a Strebel outside sensor is completely optional.
When an outside temperature sensor is connected, the boiler will control the flow water temperature by using a calculation which is relative to the outside temperature. A simple parameter change may be needed and the sensor can simply be wired in to the boiler electrical connections. Please see the boiler installation and user manual for reference.

Will the Strebel SC boiler be supplied with an in-built expansion vessel?

Strebel give the option for an in-built expansion vessel for this particular range of condensing boiler. When placing your order, if you require an internal expansion vessel, you will need to specify you require an expansion vessel wall bracket. You will then have the option to one of either a 12, 18, 24 or 35 litre expansion vessel which will need to be mounted internal to the rear wall bracket during installation.

What is the seasonal efficiency of my boiler?

Seasonal efficiency data can be found via our downloads section. If the information you require is not listed, please feel free to contact our technical department who will be able to provide the information.

What is supplied when I order a Strebel SC boiler?

The items the Strebel SC boiler is supplied with as standard are: 1 x boiler, 1 x wall bracket, 1 x coaxial flue adapter (80/125mm).

I am looking in to specifying an ATI water heater. How much space must I leave above the water heater?

In order to allow maintenance to the flue hood and unit we ask you to leave a space of 200mm above the unit.

Do Strebel supply unvented kits for the ATI range?

Strebel is able to supply Unvented HWS kits for all of our water heaters. The Strebel ATI kits are matched to the particular model and you can find which kit you require in the appropriate manual which can be found in our downloads section.

Do I need a plinth for my Strebel ATI Water Heater?

All floor standing Strebel ATI water heaters come complete with a 110mm steel plinth which is pre mounted beneath the unit.
Your Strebel ATI water heater will need to stand level on a non-combustible floor, suitable to support the weight of the appliance, water content and all ancillary equipment.
Models ATI SP 80 & 120 are for wall hung installations. For this purpose, the unit is to be mounted using the two brackets at the back of the appliance, towards the top.

Will my ATI water heater be fitted will an anode?

All of the Strebel ATI range come complete with a magnesium type anode. These anodes are fitted to protect against metal-to-metal corrosion and it is recommended that these are replaced each year in order to extend the working life of the appliance. The anode is located in the inspection flange of the water heaters.

NOTE: Strebel no longer provide the CORREX type Electronic anode.

What flue options are available for the ATI SP range?

When locating the water heater there must be consideration taken as to the maximum permissible length of the flue system chosen and terminal position.

For available flue options, please download the PDFs below:

Do Strebel supply unvented kits for the S-WG range?

Strebel are able to supply Unvented HWS kits for all of our water heaters. The Strebel S-WG kits are matched to the particular model and you can find which kit you require by either contacting our sales or spares departments.

A Temperature and Pressure safety valve (T&P valve) of sufficient size with an opening Temperature of 100°C and a pressure of 10 bar will need to be supplied and installed on the top of the tank by the installer: an adequate tube, including a tundish also needs to be provided and installed by the installer.

Will the S-WG be delivered pre-assembled?

The Strebel S-WG Condensing water heater is split in to two families which are differentiated by the water heater capacities.

S-WG 35-55
The distinguishing aspect of this range is that the whole system is delivered pre-assembled and mounted on stainless steel supports. Water heaters with capacities of 35kW or 55kW, can be combined with tanks of 150 or 230 litres within this system. All interconnecting pipe work between the boiler and storage are supplied by Strebel.

S-WG 80-180
This range comprises of five water heaters, with capacities from 80kW to 180kW respectively. It is specifically designed to deal with greater hot water demands of larger properties like hospitals, hotels, big laundries and public facilities. Hot water storage tanks are available with capacities ranging from 300 to 750 litres.

To give the client greater variation on the installation options available for these larger units, the water heater is supplied with a frame to be sited adjacent to the boiler or where suitable in the plant room. The water heater will be delivered with a bronze pump set to for the plumber to install on his interconnecting pipe work.

I want to connect several waters in series what best practice do Strebel recommend?

When several water heaters have to be connected together it is important to connect them in such a way that they can operate individually or together.

This is possible by means of the use of gate valves, closure or opening of which allows use according to demand (high or low season, peak periods, maintenance etc.) For example of suggested ypes of layouts, please download the PDF below:

Can my S-WG condensing water heater work in conjunction with Strebel solar thermal system?

All Strebel S-WG water heaters can be utilised as part of a solar thermal arrangement.
To combine solar thermal with an S-WG water heater please be sure to take a look at our solar pre-heat packages.

Contact us today and will be happy to advise you on what options are available for your proposed plant layout.

What flue recommendations do Strebel make for the S-WG Condensing Water Heater range?

Guidance should always be sought from Strebel S-WG Installation, Operating & Maintenance Manual. This should be used in conjunction with current regulations and conform to the clean air act.

Some extracts from the manual can be found below:

  • The S-WG Boiler has a fan pressure capable of overcoming 200pa of Flue resistance and Air inlet resistance both added together.
  • S-WG Water heaters 55kw to 120kw use a co-axial flue as standard – Twin pipe flue utilises an adaptor at extra cost
  • S-WG Water heater 150 to 180kW use parallel, Twin pipe flues.
  • All S-WG models can be used in a room sealed application or, if the boiler room or fitting space complies with the relevant ventilation requirements, boilers can be non room sealed i.e. exhaust only, providing ventilation complies with current regulations.
  • Install horizontal exhaust Flue parts with at least 5.2% fall in the direction of the boiler ( more than 5 centimetre for every linear metre)

GUIDANCE SHOULD ALWAYS BE SOUGHT FROM THE MANUAL AND ALSO CONFORM TO RELEVANT BRITISH STANDARDS

Can the Strebel S-WG generate a remote signal for Heat demand/lock out conditions?

Through the use of external power (e.g.230VAC) the S-WG utilises volt free contacts which close in heat demand (13&14) or lock out (11&12) conditions e.g. a lamp or buzzer can be connected (relays are built in).

I have a flat roof and I don’t want an incline on my collectors as I do not want them to be visible from the ground due to building aesthetics.

Strebel currently provide the AS100 DF 6 collectors which can be mounted on a flat roof or vertical facade (0-90˚). The tubes themselves can be rotated individually to gain a maximum solar potential, as illustrated in the PDF below.

Which biomass boiler should I choose?

Our extensive range of boilers we are able to supply can be easily narrowed down to find the correct solution for you. You will need to know which bio-fuel will be used by your boiler over its life time. The difference in the transport, storage, extraction system and sometimes safety equipment with the different fuel can sometimes expand the time – and ultimately the cost of the project dramatically.

Strebel are committed to finding the right solution for you and by providing a professional before and after sales service, as well as trained technical advisors and area managers located around the U.K, we will assist with control schemes, wiring schematics, handover assistance and also provide support with regards to grants and funding available.

Which Fuel should I use?

With regards to the fuel comparison, it can sometimes be based wholly on the fact of what is readily available to the end-user. There are now several different established supply chains for biomass fuels in the U.K. What needs to be taken into consideration is that fuels such as wood pellets are manufactured and they are done so to a very high standard of which the manufacturers need to abide to. The small, regular and rounded shape of wood pellets makes handling easy and reliable – they rarely hang up in bins, or jam in feed augers (with wood chip there is no vacuum system or flex screw – fixed screw only). Pellets are wood that has been cleaned, dried, and ground to a fine powder before being compressed in a die to make a small, regular, pellet. Driving off the water increases the energy content, and compression increases the density – making wood pellets a much cheaper fuel to transport and store than raw wood or wood chips. Comparing wood pellet to chip, the ashes produced by pellets can in some cases be 20-30% less than as produced by chips.

With wood chip fuel, after the cutting of wood to chips you also have to weather the chip otherwise you can have up to 52% moisture content – that means 50% water in the burning equipment. We generate steam in the boiler if the chip is not of a good quality, or high moisture content. The Boiler runs with 40% and more but, if you do this over a long period of time the boiler could well be damaged. Research has shown wood chip needs 35% more volume of storage room for the same output with pellets. The boiler will also need to adjust a lot more often due to the variation in the bark being supplied.

When fire wood is to be used, like wood chip, after cutting you also have to weather the logs. Below is a table for the typical drying time for split logs (PDF).

Should you seek further guidance contact your local fuel supplier, or alternatively please do not hesitate to get in contact so we can help you to decide which fuel is best for you.

What is biomass and what benefits would I get from using it?

Biomass is a renewable, low carbon fuel that is already widely available throughout the UK. Its production and use also brings additional environmental and social benefits. Correctly managed, biomass is a sustainable fuel that can deliver a significant reduction in net carbon emissions when compared with fossil fuels.
By burning biomass the recently captured carbon is released back into the atmosphere as CO² – and a carbon cycle is then complete.
Wood pellet, wood chips, grain, rape seed, cocoa pellets and fire wood are all compatible with Strebel Boilers and many end users find it is cheaper to use biomass fuel than fossil fuels.

Like other technologies biomass is eligible for renewable heat incentives and grants which are currently being implemented in the U.K.

Will I require a buffer vessel or thermal store?

Strebel supply buffer tanks in all sizes up to 5000litres. Buffer tanks are large and highly insulated water tanks that act as a heat store and give instant heated water if the demand is high. Our fully automated pellet boilers can in some cases be plumbed straight into the circuit but log and chip boilers need buffer tanks regardless. Depending on which type of solar thermal system you are installing, you may also need a buffer tank too. They add cost to the project but it makes sense in many cases and can allow for a slightly undersized boiler if there is a buffer tank to take the strain. Should you seek further guidance please do not hesitate to get in contact so we can help you to size your buffer vessel as per your system requirement.

Where is the best place for the panels to be placed/facing?

Due South (Azimuth 0O) is the optimum orientation to maximise solar gain. (Due North if you are in Australia!) .
Optimum angle of inclination is 35O to 40O from the horizontal, depending on location.
(Latitude x 0.7 to be precise. Plymouth is 50.38O x 0.7 = 35O, however, Aberdeen is 57.17 O x 0.7 = 40O).

Strebel Taurus – Fault Finding guide

Please download the PDF attached for more on Fault Finding

How much fuel will I need to store?

This will depend on the size of the boiler (output in kW) as well as the size and heat demand of the property. Energy density of the fuel as well as the type of fuel also affects quantity, space needed and cost of fuel. There are calculations that your installer can do to give you a tonnage per year and wood fuel information and average prices. Fuel consumption information can also be found in the technical data chapter of each boiler installation manual, but should you seek further guidance please do not hesitate to get in contact so we can help you to size your fuel storage as per your requirement. We can provide specialist fuel storage solutions including sourcing outdoor, cascade arrangements, other level spiral conveyance and walking floors – we really can cater for every particular site condition.

Surely in the grey winter months and foul weather conditions the U.K is sometimes subjected to, how will I gain in times of little sun?

With flat plate collectors the radiation in foul weather conditions is almost useless; however, with the use of evacuated tube collectors you can make it useful energy.
By minimizing thermal losses of a collector, Strebel have produced a solar solution which still harnesses the suns radiation through times of low outside temperatures and periods of minimal sunlight.

What is solar thermal?

Solar thermal energy systems capture the heat of the suns solar irradiation and use it to heat water. Solar thermal generates renewable heated water using solar panels – known as collectors. Solar heat warms the fluid, usually glycol – an anti freeze and good heat transfer solution – which is then pumped to heat water in a hot water cylinder or other heat exchanger. The solar fluid is then pumped back up to the collector, where it is again heated by the sun.

What benefits do I get from using Solar Thermal?

The main benefit of using solar thermal is that you are using a renewable heating solution, having nil impact on the environment. You of course will also be saving money on your fuel bills in a time where energy prices are ever-increasing. Solar thermal should work all year round during the day but consumers will probably need to heat the water further in winter months, using a boiler or immersion heater. As well as this, solar thermal can cost a lot less to install when compared to other microgeneration technologies. Like other technologies solar thermal is eligible for renewable heat incentives and grants which are currently being implemented in the U.K.

STREBEL high performance vacuum tube collectors are compatible with all STREBEL boilers (condensing, oil, gas and biomass) in combination with a buffer calorifier.

Why use solar in the U.K? My climatic perception would tell me I surely wouldn’t gain much solar yield?

Firstly, There are of course a large number of ‘wet’ heating systems in the U.K. Along with the large boiler replacement market and how solar can function easily in conjunction with high efficiency boilers and water heaters, the U.K is the perfect market to gain from Solar thermal Technology. Average annual available solar irradiation in the UK is between 900 kWh/m2 and 1,200 kWh/m2. The U.K experiences around 60% of the solar energy when compared to what is received at the equator.

What is renewable energy?

In simple terms, renewable energy is energy which can be used from natural resources (sunlight, wood, wavepower etc) and is inexhaustible. Investments in renewable energy have been increasing since the environmental movement of the 1960s and 70s, and more recently due to renewed concerns about global warming and Peak Oil. Fossil fuels pollute the earth, are limited in nature, and are controlled by undemocratic states in politically volatile regions. Using our limited quantities of fossil fuel energy to invest in a renewable energy infrastructure seems like a wise collective decision for the human species to make.
The UK is committed to tackling climate change, reducing its greenhouse gas emissions and meeting energy demand for future generations.

At Strebel, we aim to supply environmentally friendly products with low carbon emissions to meet the growing demand for the use of bio-fuels and renewable energy products. We now supply a full range of biomass boilers as well as solar thermal vacuum tube collectors. Renewable technologies has been our speciality for over 25 years and we are renowned to be one of the most efficient, reliable and innovative manufacturers available to the UK market. STREBEL renewable packages come complete with full product and design support at all stages of the project and we provide a full after sales service with a fully trained servicing and commissioning and technical engineers only a phone call away.