Grundfos pump replacement
Updated: 22 October 2026
The label on your old pump says Grundfos UPS or UPS2, the merchant quote for a UPS3 made you wince, and amazon.co.uk is full of direct-replacement circulators at a lower price. This page explains how to read that nameplate, when a 130 mm budget swap fits the same footprint, and where the OEM path and the marketplace path diverge. No Trident or JASSFERRY row here is a Grundfos factory clone. Prices sit on the [heating pump comparison](/hub/heating/heating-pump). Review-depth picks are on [best central heating pump](/hub/heating/heating-pump/sub/heating-pump-best). Peter F. compared the amazon.co.uk listings and public UK guidance. There was no lab test. A qualifying purchase can earn a commission at no extra cost to you.
The label on your old pump says Grundfos UPS or UPS2, the merchant quote for a UPS3 made you wince, and amazon.co.uk is full of direct-replacement circulators at a lower price.
The label on your old pump says Grundfos UPS or UPS2, the merchant quote for a UPS3 made you wince, and amazon.co.uk is full of direct-replacement circulators at a lower price. This page explains how to read that nameplate, when a 130 mm budget swap fits the same footprint, and where the OEM path and the marketplace path diverge. No Trident or JASSFERRY row here is a Grundfos factory clone. Prices sit on the heating pump comparison. Review-depth picks are on best central heating pump. Peter F. compared the amazon.co.uk listings and public UK guidance. There was no lab test. A qualifying purchase can earn a commission at no extra cost to you.
Our top picks
| Badge | Product | Port length | Max head | Unions | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  Trident Trident TP25-60-130 | 130 mm | 6 m | In the box | 9.2 | about £42.99 | View offer |
| Alternative |  Trident Trident WRS25/60-130 | 130 mm | Not stated | Mentioned in reviews | 9.0 | about £42.99 | View offer |
| Best value |  Anesty Anesty | 130 mm | 3–6 m | 1½ to 1 in reducers | 8.6 | about £35.90 | View offer |
On this page
Read the old nameplate first
Before you search for a Grundfos pump replacement, photograph the model, for example UPS 25-60, the serial, whether 130 or 180 spacing is printed, the 230 V supply, and any EEI figure on the metal plate. 15-50 versus 25-60 describes duty class, the head and flow the impeller is designed to meet, not a physical length. UPS2 adds headroom in newer installs. UPS3 is the efficiency generation in Grundfos literature. Your pipework still cares about the length between flanges and the union size.
If the plate is unreadable, measure port-to-port and note how many radiators the zone feeds. Wrong duty can mean noise or cold upstairs even when the pump fits mechanically.
130 mm footprint: when pipework stays put
Most domestic Grundfos UPS-family pumps in UK homes use 130 mm centre distance and 1½ in BSP unions. Several rows in this comparison target that footprint, including the Trident TP25-60-130, the Anesty, both JASSFERRY listings, and the Trident WRS25/60-130, so you should not need to cut pipe if the spacing matches. 180 mm systems exist. Forcing a 130 mm body into that gap will fail.
The flow arrow must match the removed pump. Grundfos installation guidance shows vent and wiring conventions that third-party units echo and do not copy line for line. Direct replacement in a title means marketing alignment, not a guarantee that Part L paperwork or a landlord will accept the swap. Verify CE or UKCA marks and the EEI on delivery.
OEM UPS3 versus budget alternatives
Buying a Grundfos UPS3, or a merchant’s OEM stock, is the straight route when you want manufacturer literature, spare-part traceability, and an efficiency class Grundfos documents for an EEI of 0.23 or lower. Cost is higher. Lead time may or may not beat a weekend delivery, depending on your postcode.
Budget Trident, JASSFERRY, Anesty, and Unvented Components Europe rows trade brand pedigree for prices from about £35.90 to about £48.50 on the lead standard listings, and for review depth on the busiest SKUs. They are marketed as Grundfos-compatible on footprint. Duty and noise still have to match your system. Some engineers refuse to fit a customer-supplied online pump. Ask before you assume. Others will fit a labelled 130 mm kit with connectors in the box.
Neither path fixes sludge, air, or unbalanced TRVs. Inhibitor and the decision order are on the heating pump buying guide. A landlord or a warranty job sometimes cares more about documentation than £20 saved. A merchant invoice for a UPS3 with a visible EEI may pass inspection where a grey import cannot. Policy varies, so ask. A homeowner doing a like-for-like weekend swap often accepts marketplace supply when 130 mm spacing and 25-60 duty match and the old pump failed mechanically.
What reviews say after a Grundfos swap
UK texts on the Trident TP25-60-130 often compare noise favourably with a tired Grundfos on speed 1, praise connectors in the box, and mention installer surprise at the price. That is reviewer comment, not a measurement. Recurring negatives include whine on speeds 2 and 3, and a pump that feels more powerful than the old 25-60 if left on high speed. JASSFERRY rows draw repeat-purchase comments in UK reviews. Treat those as claims, not a test.
A budget swap is not automatically quieter or more efficient than a worn but correctly sized Grundfos. It is new bearings and an impeller, plus modern marketing. If the new unit screams after a careful install, work through air and speed on central heating pump noisy before you blame the channel and reorder. The WRS25/60-130 shows the other trade-off: 128 UK reviews at 4.5 stars, and head and flow left blank on the captured listing. Fine if your photo of the old UPS plate is clear. Awkward if you shop from the title alone. The KPS25-6-130 undercuts on price, about £39.97, with 130 mm printed, and only eleven reviews.
Pick from this comparison
Stay with a standard circulator unless you know the old unit was boost class. Sort by review count when you want social proof: the TP25-60-130 leads with 860 UK reviews. Sort by price when the Anesty at about £35.90 or the JASSFERRY at about £37.99 still matches the plate. Do not treat the TP25-90, 2.4 from sixteen UK reviews, as a Grundfos stand-in.
The drain-down sequence is a separate page, linked below. When you want the shortlist with the walk-away cases spelled out, that lives on the best-pump page already linked above.
Common questions
Will a Trident TP25-60 fit where my Grundfos sat?
If the old unit is a 130 mm UPS or UPS2 class pump with the same unions, mechanical fit is likely. Confirm it with a centre-to-centre measurement and a union check, not with the title alone. A 180 mm gap will not take this body without pipework.
Do I need a UPS3 or is a budget pump enough?
Choose a UPS3 when you want Grundfos literature and a documented EEI of 0.23 or lower. A budget 25-60 is enough when the footprint and the duty match and you accept a marketplace supply chain. Ask the engineer before you book if they will fit a pump you bought online.
What is 15-50 versus 25-60?
They are duty labels on the plate, a head and flow class, not a length. Compare like with like when you can. Do not drop a head class on a large system just because a shorter code is cheaper. Port length is the separate 130 mm or 180 mm figure.
Will the pipework have to change?
Not on a true 130 mm swap with matching unions. A 180 mm body, or a boost pump whose ports are not printed, may need pipework. Measure before you drain down, and do not force a 130 mm casting into a wider gap.
Are amazon.co.uk pumps ErP compliant?
Some may be. Verify the EEI on the nameplate after delivery. This page does not certify listings. An A-rated bullet is not an EEI of 0.23 or lower. Since 1 January 2022, heating circulators placed on the UK market should meet that figure.
Why is my new pump louder than the Grundfos?
Often the speed is too high, air is still in the vent or the upstairs radiators, or the new duty is stronger than the old 25-60 left on its lowest speed. Tune those before you condemn the brand. Whine on speeds 2 and 3 is a recurring UK theme on the lead Trident.
Can my heating engineer refuse to fit an online pump?
Yes. Some will fit a customer kit with connectors in the box. Some will not, because of traceability or warranty. Discuss supply before you book, rather than after the pump is on the doormat and the system is drained.
What photo should I take before ordering?
The full nameplate, the union size, a 130 mm centre-to-centre measure, and the flow arrow relative to the pipes. Add the serial and any EEI figure if the plate prints one. That photo beats a direct-replacement title.
Does Grundfos still sell direct on amazon.co.uk?
OEM UPS3 listings appear at higher prices than the budget replacements in this batch. Compare who fulfils the order, and whether the listing shows the exact model your engineer specified, before you mix a merchant UPS3 with a marketplace 130 mm swap.
Related pages
Sources
Public UK sources named below. amazon.co.uk prices, stars and review counts on these ten listings were taken from the listing files read on 20 October 2026. Page updated October 2026.
- Wilo UK, replacing circulating pumps (retrieved 20 October 2026)
- Electrical Times, Wilo compliance checker (retrieved 20 October 2026)
- Ideal Heating, Part L and flow temperature (retrieved 20 October 2026)
- Approved Document L, Volume 1 (dwellings) (retrieved 20 October 2026)
- Grundfos UPS3 installation guidance (retrieved 20 October 2026)
- Grundfos, how to find a pump replacement (retrieved 20 October 2026)