A failing central heating pump means cold radiators, strange noises and, eventually, no heating at all. Here's what a replacement realistically costs in 2026, how to spot the warning signs, and why this is a job for a qualified engineer.
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Your central heating circulation pump (sometimes called the circulator) is the component that pushes hot water around the system — out from the boiler, through the pipework and radiators, and back again. On a modern combi the pump is built inside the boiler casing; on older system and heat-only setups it may be a separate unit mounted in an airing cupboard or near the cylinder. Either way, when the pump weakens or seizes, heat simply stops moving around the house.
Because the pump sits on the sealed water circuit and, in a combi, behind the boiler casing, replacing it is an engineer's job — not a DIY task. We'll come back to that.
As a rough guide, replacing a central heating circulation pump in the UK typically costs in the region of £185–£350 fitted. The spread depends on the type and quality of pump, how easy the existing unit is to reach, your region, and whether the engineer needs to drain down the system to swap it out.
| Cost element | Indicative 2026 range |
|---|---|
| Replacement pump (external/standalone) | £90–£180 |
| Labour (typically 1–2 hours) | £80–£180 |
| Internal combi pump (part only) | £100–£220 |
| Typical total, fitted | £185–£350 |
An external pump on accessible pipework is usually the cheaper end of the range. A pump buried inside a combi boiler costs more because of the strip-down time and the manufacturer-specific part. If the engineer finds the system is heavily sludged while they're in there, they may also recommend a chemical flush, which adds to the bill.
Why it varies: emergency or out-of-hours call-outs, the need to drain and refill the system, awkward access (under floorboards, in a tight cupboard) and premium pump brands can all push the figure higher. Always ask for a written, itemised quote before work begins.
Pumps rarely die without warning. Look out for these symptoms:
Try these safe checks first. Some "no circulation" complaints aren't the pump at all. As a homeowner you can safely bleed your radiators, top up system pressure to 1–1.5 bar (cold) via the filling loop, check the thermostat and programmer settings, and confirm the boiler's fuse and power. If the heating still won't circulate after that, book an engineer rather than opening the boiler.
The two names you'll most often see are Grundfos and Wilo — both long-established manufacturers used widely across UK heating systems. Many combi boilers use a manufacturer-branded pump head that is, in effect, an OEM version of one of these. A good engineer will fit a like-for-like replacement of the correct flow rate and head pressure for your system, rather than simply the cheapest unit on the van.
Replacing a circulation pump means working on the sealed heating circuit, isolating and draining water, and — on a combi — opening the boiler casing. None of that is suitable for DIY. Wherever the work touches the boiler itself, it must be carried out by a Gas Safe registered engineer; you can verify any engineer's registration at gassaferegister.co.uk. Never attempt work on the gas valve, pipework, flue, sealed circuit components or boiler casing yourself. If you smell gas, leave the property and call the National Gas Emergency line on 0800 111 999.
The legacy "CORGI" scheme is sometimes still mentioned, but it was replaced by the Gas Safe Register back in 2009 — always check the current register.
Usually, yes. A pump swap is a single-component repair, so if the rest of your boiler is sound it's a sensible fix. The maths changes if your boiler is old, out of warranty and prone to other faults — at that point a pump replacement can be money spent on a system nearing the end of its life. Our wider boiler repair cost guide sets out how individual fixes stack up against the cost of replacing the whole appliance.
This is where many homeowners weigh up a policy. A central heating boiler cover plan that includes the wider system can mean a failed pump is repaired or replaced for the price of your monthly premium (and any excess), rather than a one-off bill of a few hundred pounds. The key is reading the small print: not every policy covers system components like pumps, and some apply an excess or exclude pre-existing faults. If you're not sure whether a plan is right for you, our overview of whether boiler cover is worth it walks through the trade-offs.
See policies from a selected panel of UK providers and check which ones cover the pump, radiators and wider central heating system.
Compare boiler coverA good-quality circulation pump typically lasts around 10–15 years, though this varies with system water quality. Sludge and limescale shorten a pump's life, which is why inhibitor and the occasional flush matter.
No. The pump sits on the sealed heating circuit and, in a combi, behind the boiler casing. Where the work touches the boiler it must be done by a Gas Safe registered engineer. Homeowner-safe jobs are limited to bleeding radiators, topping up pressure via the filling loop, checking the thermostat and power, and a single front-panel reset.
It depends on the policy. Some plans cover the boiler only, while others extend to the wider central heating system, including the pump. Always check what's listed as covered and whether an excess or pre-existing-fault exclusion applies before you assume a pump is included.
A noisy pump that's still circulating water isn't an emergency, but it's a warning sign worth acting on before it fails completely. See our noisy central heating pump guide, and have an engineer assess it if the noise persists after you've bled the radiators and checked for trapped air.
Often, yes. An internal combi pump means more strip-down time and a manufacturer-specific part, which is why an internal swap tends to sit at the higher end of the £185–£350 range compared with a standalone external pump on accessible pipework.
Boiler Cover UK is an independent comparison site and earns commission from some providers. Prices are indicative 2026 UK figures and for general information only — not a quote or financial advice. We show a selected panel of providers, not the whole market.