... 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’ ...