The WD Series DHW Heat Pump is a water-source heat pump that takes over residential domestic hot water (DHW) heating from an electric or gas-fired water heating device. It is a variation on the geothermal space heating Nordic W and WH-series, which have long histories of reliable operation.
Designed for use with District Energy Sharing Systems or open loop style systems where the ground loop (Source) temperatures are 45F or above. The WD-Series is ideally suited for domestic hot water heating. It uses a domestic hot water rated heat exchanger and R134a refrigerant. Traditional geo-exchange heat pumps using R410a refrigerant cannot operate reliably or efficiently at temperatures above 120F, which is too low for domestic hot water heating.
The WD Series DHW Heat Pump is designed with small space in mind and can be wall-mounted.
The heat pump will provide all of the heating capacity of a 3000W electric water heating tank. A storage hot water tank will still be used, to store water heated by the heat pump. A standard electrical tank can also be used in case emergency back up capacity is desired (this is OPTIONAL). To simply field wiring, an accessory contactor box can be used to automatically engage the electric hot water tank in case of heat pump fault.