ESBE Single Room Pack, Grundfos UPM3 Flex: PWM-ready pump (video guide)

The ESBE single room mixing pump pack with Grundfos UPM3 Flex runs one underfloor heating circuit straight off a radiator or boiler circuit. The Swedish-made ESBE thermostatic valve has a built-in bypass and mixes the flow to 35 to 60°C. The Grundfos UPM3 Flex lets the boiler or heat pump set its speed by PWM.

Watch the full video and the quick version below, and download the data sheet and install manual for the exact specification.

Key facts

• Runs one UFH circuit off a radiator or boiler circuit
• Swedish-made ESBE thermostatic valve with built-in bypass
• 35 to 60°C mixed flow
• Grundfos UPM3 Flex, so the boiler or heat pump sets its speed by PWM
• Rated 10 bar static and 95°C max temperature
• 15mm compression primaries on isolating ball valves, 1/2" female loop threads
• Pre-wired 40°C pump switch on the primary inlet

How to fit it

1. Return on the left as supplied. Turn the top section 180° to reverse it
2. Fix the back plate level, then connect the primaries and the loop
3. Electrician wires it to a 3A fused spur and the room thermostat
4. Fill the loop fully, vent the pump and set the dial
5. Check every joint before filling and pressure test before screeding
6. Check the mixed flow against the dial with a digital thermometer

Buy it

The ESBE Single Room UFH Mixing Pump Pack with Grundfos UPM3 Flex 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.

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