... Keymark 2)High efficiency than flat plat 3)Pressure system 4)10year manufacturer solar system1. Jinyi heat pipe ... , JPH-47/15, JPH-65/18, 2) solar collector Quantity of tubes: 10,12, 15, 18, 20, 24, ... install. so when you install this solar water heater system, wil save your labor cost.7) Can be ... design.10) Large scale solar hot water system can be installed either with parallel or series connections