... automatically.Then liquid transfers heat to water by heat exchanger in the tank to heat the water Specifications: the whole ... III. Work station1,Expansion tank 5L, 8L, 12L, 24L (Made in Italy) 2,Check valve 3,Circulation pump 4,Intelligent controller ... 5,Pressure guage 6,Safety valve 7,Flow meter(Made in Switzerland)ModelTank CapacityVacuum tube specificationExpansion tank capacityLoading20’/40’/40’ ...