Single Zone Pump Unit, UPM3 Flex: One zone without a full manifold (video guide)

A pre-assembled pump and temperature control unit for one zone. It mixes the water down to floor temperature, so you can run a single room of underfloor heating without a full manifold system, and the Grundfos UPM3 Flex takes PWM speed control.

Here is how it fits and what to check, with the data sheet and install manual to download below.

Key facts

• Pump and mixing control for one zone
• Arrives assembled
• Grundfos UPM3 Flex 25-70, PWM speed control
• 3 curves, up to 7m head
• A-rated, 2 to 52W
• Pump rated to 10 bar

How to fit it

1. Fix level to the wall, motor shaft horizontal
2. Connect primary flow and return, then the UFH loop
3. Electrician connects pump, thermostat and any PWM signal
4. Fill, vent, set the mixing temperature and pick the curve
5. Run for 2 hours; pressure test before screeding
6. Check the mixed flow with a digital thermometer

Buy it

The Single Room UFH Mixing Pump Pack with Grundfos UPM3 Flex (Pre-Assembled) is available from MaxHeatUFH. Order by 12pm on a working day for next working day UK delivery. Trade customers see their trade price when logged in.

Planning a whole floor? Design your UFH system yourself in 3 minutes with MaxHeatUFH ProLoop and get an instant quick design and quote.