... useful room for you. High efficiency of the solar heater collector. Save much electricity. Main feature:1.Without water tank,improve ... China Quality Certification Center. Our solar heater has no tank,and store the hot water by pipes, one kind of ... 's capacity.So if you want 80L,the solar heater will be formed by 10 pipes of 8L ... 's,if you want 150L,the solar heater will be formed by 10 pipes of 15L's ...