... Insulation layer:Polyurethane foam,thickness:50mm,55mm(optional).Working pressure:0.6Mpa-0.8MpaElectrical heater:1500W,2000W,3000W( ... and rings:UV stabilized high temperature silicone rubber.Operating pressure:6bar-12bar.Low temperature resistance:-40 celsiusHail resistance: ... a circulation pump,a controller,a balancing valve,a pressure gauge,a safety valve etc.German import WILO water pump.Italy ...