The Defro Duo Pellet boilers have the fuel charger and burner adjusted for trees' leaf biomass in the form of pellets. The biggest advantage of the boilers constitute advanced automatics - programmer controlling central heating, hot utility water and two other pumps as wells as the mixing valve and the self-acting system: ignition, fuel charging and burner cleaning. The additional chamber created by a stationary grate cooled by water allows for temporary use of other types of fuel such as wood chips and boiler start-up in emergency cases. Moreover, the charge container can be equipped with a lamp increasing the comfort of operation.
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