OEM Domestic hot water
DWH pumps are used for recirculation or generation. They recirculate DHW from tap to tank or heat exchanger to ensure instant hot water, avoid stagnation and limit water waste. Or to circulate water between a heat exchanger and DHW storage tank, probably with diverter valve for stratification tank.
In indirectly heated DHW systems, the pump can be placed on either side of the heat exchanger. In a DHW cylinder, the potable water is stored and usually heated indirectly by primary heating water from the boiler – either by an external plate heat exchanger or by an internal indirect coil. In systems powered by renewable energy, the primary source of heating water is stored in a tank, while instant hot water is created by freshwater stations.
Domestic hot water recirculation
To avoid legionella contamination and ensure optimal comfort, hot water recirculation pumps circulate the potable water on the secondary side of the system, away from the taps and back to the water heater.
All pumps that come into contact with drinking water must be approved in order to be suitable for drinking water. Grundfos UPM3 DHW pumps are available with either stainless steel or PPS housings and are approved by KTW (DE), DVGW W270 (DE), ACS (FR) and WRAS (GB).
Externally controlled pump variants
This pump range of externally controlled pumps is designed to be integrated into applications able to remotely control the head and flow. Our UPM3 UPML UPMXL UPMXXL and UPM3 LIN variants feature a program to enable this.