solar system Certificate: SRCC, Solar Keymark, CE and ISO9001 solar systemA 50/50 propylene glycol and water mixture from ... by controller. Feature1.Simple Installation, no maintenance, effective operation 2.Easy retrofitting to existing systems 3.Suitable for single and multiple solar ... quality 5.Incoming potable water is routed to the solar storage tank 6.Porcelain enamel or SUS316 stainless steel ...