... medium liquid2) Temperature preservation is equipped with standard electric water heater setting,automatic temperature control exchanger, and increased anode ... out casing & red copper flow passage6) Glass tube: new trivalent element heat tube, borrosilicate glass 3.37) Solar ... ) With heat pipe: anti-freezing > -35 degrees centigrade9) Water capacity: 150L, 200L, 250L, 300L, 500L 10) Pressure: ...