Heat Pump Circulation Pack, UPM3 Flex: PWM speed from the heat pump (video guide)

A pre-assembled non-mixing pump set, also called a heat pump circulation pack, for heat pump and low-temperature systems where no blending valve is needed. It bolts onto the manifold, and the Grundfos UPM3 Flex 25-70 lets the heat pump set its speed by PWM.

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

Key facts

• Non-mixing, no blending valve
• Bolts straight onto the manifold
• Grundfos UPM3 Flex 25-70 pump
• PWM speed control
• 3 curves, up to 7m head
• A-rated, 2 to 52W

How to fit it

1. Offer up to the manifold and tighten joints evenly
2. Fix to the wall with the motor shaft horizontal
3. Connect heat pump flow and return with ball valves
4. Fill, vent, pick the curve and run for 2 hours
5. Check joints and pressure test with the manifold
6. Don't cover the pump control box with insulation

Buy it

The UFH Non-Mixing Pump Set 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.