... solar water heater Tank capacity:150L-500L Heat exchange (inside tank):copper coil inner tank:SUS304-2B stain house panel solar water ... combined with exising energy source, such as gas water heater, electric water heater, boiler, etc.5Auxiliary electric heating booster inside tank ... days, so as to ensure a contiuns hot water supply2double or single pipeline pump station .components:safely value, wilo ...