Water heater system 1.EN12975 solar keymark 2.Anti-freezen & ... tank temperature gets to the set value, the circulation system will start work. It will transmit the solar ... copper TU1+water,transfer power>=150W,Working pressure,4Mpa,welding pressure 4MpaDust Ring GasketSilicon Rubber Vacuum Tubetri-element ... 20102787763574022116916613613040HQ278213209172171Price(USD) Split heat pipe water heater system