... PRESSURIZED SOLAR WATER HEATER FEATURE:1. Solar water heater with SOLAR KEY MARK certificate2. Special high quality Insulated material ... solar key mark, EN12975, CCC, CE, ISO6. Can connected with the exsiting oil heater or gas heater7.Long life span ... tank/boiler, circulation pump, expansion evessel, controller,flowing meter,pressure gauge3) Capacity: 150L,200L,250L,300L,500L4) Working temperature: ...