HL 351 Domestic Heating Furnace

1 trolley,  2 transparent oil tank,  3 expansion vessel,  4 cold water circuit connections (to dissipate the generated heat),  5 water meter,  6 heat exchanger,  7 circulating pump,  8 thermometer,  9 boiler safety group,  10 boiler control unit,  11 steel boilerm,  12 thermocouple,  13 double-strand oil filter