... return, one heating source inlet, one heating source outlet, one cold water inlet... DHW tank(powder coated galvanized steel shell,stainless steel ... 165050 DSC-N-400400750*127035 DSC-N-500500750*160030 P/T valve 1/2" magnesium bar electrical immersion heater with ... return, one heating source inlet, one heating source outlet, one cold water inlet, one drainage outlet, one top air vent connector, ...