... Assistant tank water supply control pressured,5L 2.Electrical heater:1.5KW with thermostat 3.Controller system ... tube, water tank, assistant tank, copper coil, electrical right bracket (optional), stand.High quality SUS304-2B ... water, hydraulic pressure can be 0.6Mpa. Work under the pressure of pipe water. Completely automatic operation ... Technology Better Price High Qulity Pre-heated Solar Water Heater