Circulation water heaters for heat pumps

Circulation fluid heaters are designed to heat a closed-loop water flow, with the liquid being gradually heated as it passes through the heater. They are used for supplementary heat for heat pumps in winter when temperatures are too low. The heaters consist of an insulated vessel with customer connection inlets/outlets via 1''1/4 male cylindrical gas threaded fittings, heating elements formed in a pin shape, an adjustable control thermostat settable from 32 to 75°C, and a fixed safety thermostat preset at 98°C. Electrical connections are made through a plastic protection box with IP44 rating. They have the advantage of being "plug and play".