... heat transfer medium liquid2) Temperature preservation is equipped with standard electric water heater setting,automatic temperature control ... trivalent element heat tube, borrosilicate glass 3.37) Solar working station8) With heat pipe: anti-freezing > -35 degrees centigrade9) ... pure red copper TU1+water,transfer power>=150W,Working pressure,4Mpa,welding pressure 4MpaDust Ring GasketSilicon Rubber ...