The ML combustion chamber is oversized to prevent a high heat concentration and to decrease the flame temperature; it has a special geometric form to facilitate the rapid evacuation of combustion products.

The boiler may be connected to two circuits operating at different temperatures. There are two returns to the boiler:

1. Low temperature (underfloor heating, radiators with a large surface area, etc.).

2. Medium/High temperature (boiler, heated furnishing elements, ordinary radiators).

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