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Bronze circulating pump buying guide

Updated: 22 October 2026

You wait thirty seconds for hot water at the ensuite, or your installer said bronze secondary pump, 130 mm, before vanishing, and every amazon.co.uk title looks the same until you read the small print. This bronze circulating pump buying guide sets the decision order for a UK domestic hot water secondary return: potable material first, mechanical fit, duty, approvals, what is in the box, and only then star ratings. Live prices for the six listings sit on the [bronze circulating pump comparison](/hub/heating/bronze-circulating-pump). Peter F. compared those 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.

You wait thirty seconds for hot water at the ensuite, or your installer said bronze secondary pump, 130 mm, before vanishing, and every amazon.co.uk title looks the same until you read the small print.

Our top picks

Hanicks Hanicks 97549426

Best overall

Hanicks Hanicks 97549426
10.0/10about £140.00
View offer
Trident Trident TP256-130BR

Best value

Trident Trident TP256-130BR
8.2/10about £89.99
View offer
Unvented Components Europe Unvented Components Europe GPD25-6SQ-130

Rank 3

Unvented Components Europe Unvented Components Europe GPD25-6SQ-130
0.0/10about £94.77
View offer
On this page
  1. 1.Bronze DHW pump vs radiator circulator
  2. 2.Mechanical fit: 130 mm port-to-port and unions
  3. 3.Duty, speed and noise on a three-speed pump
  4. 4.WRAS and documentation before you rely on the title

Bronze DHW pump vs radiator circulator

A bronze circulating pump here sits on the potable hot water secondary loop, not the cast-iron circulator on the radiators. Wetted parts contact water you might drink, so merchants specify bronze, or an approved stainless pump in a different class, rather than a central-heating iron body. A black heating pump from stock can be the wrong material, the wrong duty label and the wrong paperwork. Worcester’s TB0050 shows a bronze pump beside the cylinder with a non-return valve and an insulated return. Lukewarm radiators are the wrong fault. Taps far from the cylinder that stay cold are the right one. Wilo’s UK FAQ on bronze versus stainless domestic hot water pumps is the material context. Fit numbers come next.

Mechanical fit: 130 mm port-to-port and unions

Most retained listings target 130 mm port-to-port and 1½ inch BSP unions. Measure centre to centre on the old flanges before you order, or photograph the nameplate. The GPD25 row prints 130 mm and 1½ inch BSP. Trident and several dearer rows leave port length blank, so check the removed unit. Union nuts and seals matter as much as the bronze body. Tower and GPD25 list connecting hardware. Hanicks lists a bronze pump only, so budget seals if the old ones are crushed. The flow arrow must match the old orientation relative to the non-return valve, covered on the secondary return bronze pump page. A 180 mm pump will not take a 130 mm row without pipework changes.
Hanicks Hanicks 97549426

Testsieger

Hanicks Hanicks 97549426
10.0/10about £140.00
View offer

Duty, speed and noise on a three-speed pump

Duty in this set clusters around 6 m head and, where printed, about 57–65 litres per minute. That class suits a typical house secondary loop when the pipework is sensibly sized. These are fixed three-speed units, not auto-adapt heating pumps. Speed 1 is the usual start after commissioning. Speed 3 left on all day adds heat loss and noise. Extra head does not fix a reversed non-return valve or a bare return under the floor. ErP EEI on the nameplate beats an efficient bullet, and this set does not certify any listing until you read the plate. Named listings are on best bronze circulating pump.

WRAS and documentation before you rely on the title

The Water Fittings Regulations 1999, Regulation 4, require fittings on potable water to be of an appropriate quality. WRAS approval is a common UK proof point, not the only route. In this set only Hanicks 97549426 carries WRAS approved in the amazon.co.uk title. The other rows do not state it, so bronze in the title is not approval. Landlords and repeat installers often need that wording on the invoice and a nameplate photo. The steps are on the WRAS approved bronze circulating pump page. Archergas DHW15 is an off-Amazon benchmark for 6 m, 65 L/min and 130 mm. It does not replace the ASIN you buy. Recheck the GBP price at checkout.

Common questions

Is a bronze pump the same as my radiator circulator?
No. The radiator loop uses a central-heating circulator, often cast iron, on water you do not drink. A bronze domestic hot water pump serves the secondary hot water return with potable-suitable wetted parts. Category mix-ups on amazon.co.uk are common. Read the application line on the listing.
What does 130 mm port-to-port mean for a swap?
It is the centre-to-centre distance between the pump flanges. Match it to the old pump or the cylinder kit drawing before drain-down. A 180 mm unit cannot be replaced by a 130 mm row without altering the pipework.
Do I need WRAS approval for a domestic ensuite loop?
Not every homeowner insists on WRAS wording, but installers, landlords and agents often do for an audit trail. Only one row in this table states WRAS in the title. The others need a nameplate check or professional sign-off.
Is 6 m head enough for a typical house secondary return?
For most domestic secondary loops in this batch, 6 m head is the stated class. If distant taps still run cold after a correct pump swap, suspect loop design, insulation or controls, not only the head on the label.
What should be in the box besides the pump?
Ideally union nuts, seals and instructions. GPD25 and Tower list connecting hardware. Hanicks lists the pump only, so plan the seals before you isolate the water.
When is a plumber mandatory?
Unvented cylinder work you are not certified for, repeated union leaks after a re-seat, a gas storage cylinder train you cannot isolate confidently, and wiring beyond a fused spur you are unsure about are all stop points for a registered professional.

Related pages

How to install a bronze circulating pump

Bronze circulating pump

Best bronze circulating pump for a UK secondary loop

Secondary return bronze pump: loop layout and duty

WRAS approved bronze circulating pump: what counts

Sources

Public UK sources named below. amazon.co.uk prices, stars and review counts on these six listings were taken from the listing files. Page updated October 2026.

  1. Wilo UK: bronze vs stainless domestic hot water pumps (retrieved October 2026)
  2. Worcester Bosch TB0050 secondary circulation (retrieved October 2026)
  3. HSE HSG274 Part 2: hot and cold water systems (retrieved October 2026)
  4. Archergas DHW15 reference duty (retrieved October 2026)
  5. BritTherm bronze circulator use cases (retrieved October 2026)
  6. Approved Document G (2024 amendments) (retrieved October 2026)
  7. amazon.co.uk listings for the six retained pumps (retrieved October 2026)