Central heating
Heating circulation pump replacement
If the boiler heats but radiators stay cold, heat moves slowly through the house, or the pump is noisy or silent, the circulation pump may be part of the problem. The fault still needs to be separated from pressure, air, closed valves, controls or a wider heating circuit issue.
Photos of the boiler, circulation pump, pressure gauge and your commune help prepare the response.
Useful details to send
- Which radiators are cold and when the issue started.
- Photos of the boiler, pump area and pressure gauge.
- Any fault code or unusual noise.
- Your commune and access details, subject to availability.
What a circulation pump does
The heating circulation pump moves hot water from the boiler through radiators or underfloor circuits. When it is blocked, worn, wrongly set or no longer compatible with the installation, the boiler may run while heat does not reach the rooms properly. Typical symptoms include cold radiators, uneven heating, humming, vibration, short cycling or a hot flow pipe with poor return circulation.
This page is for pump assessment and replacement. A broader no-heat problem may belong on heating breakdown help, while leaks or sludge-related circulation issues may connect with heating circuit repair.
Safe checks before calling
- Look at the pressure gauge without opening electrical parts.
- Check whether all radiators or one zone are affected.
- Listen for humming, grinding or no sound at all.
- Do not force pump screws, wiring or valves if you are unsure.
- Take clear photos from a safe position.
Common pump-related situations
Circulation problems often appear when heating is restarted after a long pause, after work on the system, during cold weather, or when an older pump has become noisy. The right response depends on the age, accessibility and compatibility of the current pump.
Blocked or seized pump
Some pumps can stick after inactivity. A check helps decide whether freeing it is realistic or replacement is safer.
Noisy pump
Noise can mean wear, air, wrong speed, poor flow or debris. The sound and timing matter.
Uneven radiator heat
Uneven heating can be pump-related, but balancing, air, valves and pipe restrictions also need consideration.
How replacement can proceed
The work may include isolating the pump area, safely removing the old unit, checking connections, installing a compatible model, restoring pressure, bleeding if needed and testing heat circulation. On older systems, additional issues may show after flow is restored.
Price factors
Cost depends on the pump model, size and control type, isolation valves, access, whether partial draining is needed, condition of unions and seals, electrical compatibility and testing time. A single estimate without seeing the setup can be misleading.
Related heating pages
If the circuit loses pressure, see heating leak repair. For preventive checks, see heating circuit maintenance. If the boiler itself is near end of life, see boiler replacement.
Send photos before buying a pump
Buying a replacement pump before checking the current model, pipe spacing, controls and access can create extra work. Send photos and symptoms first so the request can be assessed more realistically.
Photos of the boiler, circulation pump, pressure gauge and your commune help prepare the response.
Frequently asked questions
How do I know the heating pump has failed?
Cold radiators, poor circulation, pump noise or no vibration can point to it, but pressure, air and valves must also be checked.
Can a circulation pump be repaired?
Sometimes a stuck pump can be freed, but worn or incompatible pumps are often replaced.
Will the whole system need draining?
Not always. It depends on isolation valves, pump position and the condition of the fittings.
Is the pump the same as the boiler?
No. The pump moves water around the heating circuit; the boiler produces heat. Either can cause heating problems.
What affects the price?
Model, accessibility, fittings, draining, electrical/control compatibility and testing after installation.
What photos help most?
The boiler front, pump label or position, pressure gauge, fault code and the area around the pipe connections.
Request heating pump guidance
Describe the symptoms, your commune and send photos if available.
Request a callback
Describe the issue and leave your phone number. Clear details help prepare the response.