... .10 day delivery 4. 20 years lifetime Passive Solar Energy System with SOLAR KEYMARK 1.Solar water heater with SOLAR ... , water tank/boiler, circulation pump, expansion evessel, controller,flowing meter,pressure gauge3) Capacity: 150L,200L,250L,300L,500L4) Working temperature ... ²,7.76 m²7) Cold resistance: -308) Stagnation temperature (°C): 3009) Tube Hail Resistance ≤25mmSolar Hot Water System Packing:1 ...