The best water booster pumps, compared.
Top pick: Aolidsive DC booster Best value: KATSU 260W booster – About £69.99 with 3.9 from 178 reviews on gravity-fed showers, if you can prime it and connect a pump that arrives without a plug. Updated 17.10.2026.
A water booster pump on amazon.co.uk is not one machine. The same search covers a twin-impeller shower pump for a gravity-fed tank and cylinder, a small inline pump on one tap, and a self-priming unit that can feed a garden tap. A loft cold tank plus a hot cylinder can take a shower pump. A combi is mains-fed, and a gravity shower pump is not the default there. In England and Wales you give notice before a pump draws more than 12 litres per minute from a supply pipe. It has no plug and the spec says 220 V. How to match a pump to a measured flow is in the [water booster pump buying guide](/hub/hot-water/water-booster-pump/sub/water-booster-pump-buying-guide). An inline booster, such as the BritTherm, the Gugxiom, the two Felenny listings or the Aolidsive, sits on one pipe for a tap or an appliance.
A water booster pump on amazon.co.uk is not one machine.
28 products checked · 62 hrs invested · +21,400 readers
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Personal buying guide
Question 1 of 2
What are you boosting?
The Aolidsive DC booster claims three speeds and a 35 L/min maximum flow, making it look flexible for a compact inline installation. The highlight also names a UK plug and a built-in AC-to-DC converter, which is more reassuring than a bare low-voltage pump, although the included-components field simply says no. Its power information conflicts: the specification gives 100 W while a bullet lists 100, 150 and 200 W settings. The 5.0-star rating is based on only two ratings, with just one short UK review saying that it is powerful and does the job. Head, material and meaningful box contents are not stated, so there is too little detail to judge whether the claimed output fits a particular plumbing system. The high star average should therefore be treated as very limited evidence rather than proof that this is the best pump.
Pros
Cons
Best for: A buyer willing to verify the exact model, included converter and pipe compatibility for one clearly defined outlet.
Less suitable: Decisions based on established reliability, detailed hydraulic specifications or balanced shower-pump duty.
Specifications
Common questions
How much power does the listing state?
The specification horsepower field says 100 watts. The bullet and the highlight say three settings: 100 W, 150 W, or 200 W.
Does it include a UK plug?
The highlight names a UK plug and a built-in AC to DC converter. The included-components field says no. Head and material are not stated.
What do the reviews say?
The star line is 5.0 from 2 ratings. The listing has one UK review text, from 18 September 2026, which says it is powerful and does the job. No complaint is in that text.
The Bristan ST PUMP15TN is the clearest match in this set for boosting both hot and cold sides of a compatible gravity-fed mixer shower. It is rated at 1.5 bar and 32 L/min, uses 15 mm push-fit connections, and includes the fixing kit, which gives you a more coherent installation package than the generic inline pumps. Its 4.2 rating from 86 reviews combines a relatively strong average with a useful evidence base; buyers often report clear instructions and straightforward fitting. Replacement is not always drop-in, because one reviewer found it slightly taller than a Salamander CT50 with connections about 4 cm further apart. There is also a report of the cold side failing after eight months, so the three-year warranty claim remains relevant. The maker's documentation limits it to gravity systems and says it must not be connected directly to the mains, making it the top pick here only when your measured flow and head arrangement are suitable.
Pros
Cons
Best for: A compatible positive-head, gravity-fed mixer shower needing balanced hot and cold boosting.
Less suitable: Combi boilers, direct mains supplies, negative-head layouts or tight replacements that require identical connection spacing.
Specifications
Common questions
Is this a single or a twin pump?
The bullet says single speed, twin impeller. Inlet and outlet are 15 mm push-fit hoses, and a fixing kit is included.
Does the listing say positive head or negative head?
It does not. The title is a 1.5 bar twin-ended shower pump. Head type is not stated.
What do UK reviews say about fitting?
Reviews call the instructions clear and several installs easy. One replaced a Salamander CT50 and found the Bristan slightly taller, with connections about 4 cm further apart. One cold side stopped after eight months.
The Gugxiom 100W 24V is an automatic inline booster whose UK reviews include stronger washing-machine filling and better flow at a hot tap. The listing claims 25 L/min, 25 m head and a dry-run stop, while a low-pressure mode gives it more control options than the cheapest Felenny units. A separate power supply is included, but the listing does not confirm a BS 1363 plug and one reviewer was concerned about how close the electrical socket sits to the water outlet. Its 4.1 rating is based on 32 reviews, enough to show both successful installations and a report of failure within a month, but not enough to erase that reliability concern. IP56 appears in the title rather than the technical table, so it should not be assumed to have a higher enclosure rating. It suits a modest single-outlet problem only after you have confirmed the electrical arrangement and installation environment.
Pros
Cons
Best for: A compatible single tap or appliance feed where automatic control and a supplied 24 V power unit are useful.
Less suitable: Wet locations with uncertain electrical protection, whole-house duty or a balanced gravity-fed mixer shower.
Specifications
Common questions
Does the Gugxiom include a mains plug on the pump?
The included components list a power supply, not a BS 1363 plug on the pump body. The title says 24 V. The spec table does not repeat the voltage.
Is dry-run protection listed?
A bullet says the pump stops when inlet water approaches zero. That is a listing claim, not a test result.
What did UK buyers say about the electrics?
One review says the power socket sits close to the outlet and guesses the unit is not IP65. Another says it stopped in under a month. Others report an easy fit and a stronger washing-machine fill.
The KATSU 260W booster is a more substantial household unit than the small 24 V inlines, with a stated 20 L/min flow and automatic or manual operation. Its 3.9 rating from 178 reviews is the largest review base in this comparison, and buyers repeatedly describe useful gains on gravity-fed showers at a relatively moderate £69.99. That evidence also exposes the compromises: several reviews mention a high-pitched noise, a short cable, slow automatic switching or failure after several months. The pump arrives without a plug, the specification says 220 V, and a competent person must confirm how it can be connected safely to a UK 230 V supply. It is not self-priming, so running it dry can damage the seal and impeller. For a compatible gravity-fed application it is the best-value listing here, but the electrical work and mixed reliability record prevent it from being a simple plug-in recommendation.
Pros
Cons
Best for: A price-conscious gravity-fed household installation where priming, fittings and a safe UK electrical connection can be handled properly.
Less suitable: Plug-and-play installation, dry-running risk, quiet cupboards or mains-fed combi systems.
Specifications
Common questions
Does the KATSU 260 W come with a UK plug?
The bullet says it comes without a plug. The spec voltage is 220 volts. You need a competent connection before it can go on a UK socket.
Can it run dry?
The listing says it is not self-priming and that a dry run may damage the seal and impeller.
What do UK reviews repeat?
Buyers mention a reasonable price, 3/4 inch BSP fittings, and use on gravity-fed showers. They also mention noise, a short cable, a slow auto switch, and at least one failure after about six months.
The BritTherm B2 12/10-162 is a bronze inline pump sold with 3/4-inch coupling nuts, a claimed UK-plug cable and automatic operation when a tap opens. Its listing states 1.8 m³/h flow and 10 m head, and the claimed six-year warranty partly explains the £164 price. The evidence is thin, though: its 3.9-star average comes from only four ratings, and one UK review says the pump began running continuously after about three months. The listing also confuses 10 m of head with a separate 10 bar claim, while voltage appears as both 230 V and 240 V. A bullet describes WRAS-compliant bronze, but the listing provides no approval number or model-specific certificate to verify that claim. It may suit a carefully checked inline hot-water job, but the sparse reviews and contradictory specifications make it a weaker recommendation than its material and warranty language suggest.
Pros
Cons
Best for: A professionally checked 3/4-inch inline installation where bronze construction and a supplied UK cable matter.
Less suitable: Buyers relying on extensive review evidence, a verified WRAS approval or unambiguous pressure specifications.
Specifications
Common questions
Is the BritTherm WRAS approved?
The bullet says WRAS-compliant bronze for drinking water. The listing has no WRAS approval number, model list, or expiry date.
Is the head 10 metres or 10 bar?
The title and the spec say 10 m. A bullet says pressure up to 10 bar. Those are different claims in the same listing.
What did the four ratings include?
Three UK texts are in the file. Two are positive, including hot-water flow after about two weeks. One says that after about three months the pump ran continuously and no longer worked as a booster.
The Felenny 24V black is a low-cost inline option that UK reviewers say can turn a weak feed into a usable shower, with automatic starting and stopping when water flows. Its listing claims 32 L/min and 22 m of head, although these are seller figures rather than independently tested results. The 24 V pump needs a suitable mains supply, and the listing does not clearly state the adapter voltage, BS 1363 plug provision or IP rating. Review evidence is mixed: some buyers report a worthwhile pressure increase, while others mention a very short cable, a high-pitched attic noise or failure within months. Its 3.7-star score comes from the same 97-review set used for the white Felenny listing, so those reviews must not be counted twice. This is therefore a conditional budget choice for a clearly compatible single pipe, not a substitute for a specified twin shower pump.
Pros
Cons
Best for: A budget boost to one compatible hot- or cold-water outlet where a safe 24 V supply can be confirmed.
Less suitable: Gravity-fed mixer showers needing balanced hot and cold supplies, or installations without clear electrical and ingress-protection details.
Specifications
Common questions
Does the Felenny black listing say hot and cold?
The highlight says hot and cold water pressure pumps for a toilet, kitchen sink, and garden. A UK review used one on hot water and later reported a failure. No temperature limit is in the spec table.
What voltage does this pump use?
The bullets say 24 V DC at the pump. The power-source line says corded electric. A mains voltage is not stated.
Are the reviews separate from the white Felenny?
The listing repeats the same UK review texts and the same 3.7 from 97 as the white Felenny. The counts should not be added together.
The Felenny 24V white offers the same claimed 32 L/min flow and 22 m head as the black version, with a flow sensor intended to start and stop the pump automatically. At £29.99 it is one of the cheapest routes to boosting a single compatible outlet in this comparison. The listing is inconsistent about construction, however: the technical table says ABS while a bullet describes a copper core. Its 3.7 rating from 97 reviews is not an independent body of evidence because the review texts are duplicated from the black listing. Those reviews include useful reports of stronger showers, but also noise, short cabling and early failures. With no stated warranty and no clear UK mains-adapter specification, you should treat it as a conditional DIY component rather than a complete, documented shower-pump package.
Pros
Cons
Best for: Low-cost single-outlet boosting where the pipework, temperature range and 24 V power supply are verified before purchase.
Less suitable: Buyers who need a documented UK plug, warranty, clear body material or balanced mixer-shower supply.
Specifications
Common questions
What is the body made of?
The technical details say ABS. The bullet says copper-core materials. Both are in the listing, and they are not the same.
Does the white model claim hot water?
The title says hot and cold water pressure pumps for a toilet, kitchen sink, tap, and garden. No maximum temperature is given.
How does the review count relate to the black listing?
The listing uses the same review texts and the same 3.7 from 97 as the black Felenny. It is not a second set of 97 opinions.
The KATSU 151438 is a heavy self-priming home-and-garden pump rather than a conventional twin shower pump, with a stated 3.5 m³/h flow and 45 m maximum head. One UK reviewer reports that it supplied three first-floor showers for years, showing the sort of larger-duty job it can perform when correctly specified. The listing also claims automatic stopping and no-water protection, but its basic data are unusually inconsistent: power appears as 750 W, 800 W and 120 W in different fields. A reviewer says the ports are 32 mm rather than a direct match for common 22 mm domestic pipework, and other reviews mention leaking or a split casing. Most importantly, the listing says it is not suitable for drinking water. At £129.99 it only makes sense for a non-potable application that genuinely needs self-priming and where a plumber has checked the connections.
Pros
Cons
Best for: A checked non-potable home or garden system that needs a self-priming pump with higher stated head.
Less suitable: Drinking-water services, straightforward 22 mm replacement work or buyers needing consistent technical documentation.
Specifications
Common questions
Can this pump supply drinking water?
The listing says it is not suitable for drinking water.
Which power figure should you read?
The title says 750 W, the horsepower field says 800 watts, and the included-components line says a 120 W pump. All three appear on the listing.
Will it fit 22 mm pipe?
The spec table does not state the port size. A UK review says the openings are 32 mm and are not a direct fit on 22 mm domestic supplies.
For this comparison we read the eight amazon.co.uk listings in this folder, captured on 15 October 2026. The number on each row is that listing’s star line times 20, shown on a ten-point scale. It is not a lab mark, a flow test, or a WRAS approval. Price is not inside the score. It is used only to name the best-value row. The top pick is the twin shower pump that matches a gravity-fed mixer, with a usable review count. A listing conflict, a missing plug, or a dry-run warning stays in the written assessment.
System match
25%A loft tank and cylinder can use a shower pump. A combi or unvented cylinder is mains-fed. A gravity twin is not the default on a combi.
Flow and head
20%Measure flow with a jug before you pick positive head or universal. Maker minima differ. There is no single legal number, and lift height is not turned into bar without the maker’s curve.
Outlet and connections
20%A mixer shower needs a twin impeller. One tap or a washing machine can be a single inline pump. Port size has to suit the pipe you already have.
Supply and dry running
20%UK mains are 230 V and plugs are BS 1363. A 24 V pump still needs a dry mains supply. A non-self-priming pump must not run dry.
Listing evidence
15%Stars and review counts are the amazon.co.uk figures. Two ratings are not treated as stronger than a larger sample, and a WRAS-compliant bullet is not an approval number.
Start with the plumbing you already have, then the outlet, then the plug. A wattage in the title does not tell you whether the pump belongs on a gravity shower, one tap, or a garden supply. Prices in this amazon.co.uk capture run from about £29.99 to about £200.68. The notes below are the limits in the listings and in the public UK rules, not a lab test.
A water booster pump on a UK listing is a label, not a single machine. Shoppers use it for three jobs. A gravity shower pump, such as the Bristan ST PUMP15TN in this set, is a twin-impeller unit for a loft cold tank and a hot cylinder, so a mixer shower gets hot and cold together. An inline booster, such as the BritTherm, the Gugxiom, the two Felenny listings or the Aolidsive, sits on one pipe for a tap or an appliance.
The title wattage does not name the system. A 24 V inline pump, a 260 W household booster and a 1.5 bar twin are different machines. Match gravity, combi or one tap first.
One bar is about 10 m of water only as a rule of thumb. The BritTherm title says 10 m and a bullet says 10 bar. Those are different claims in one listing. Use the maker’s curve, not a conversion you invent.
A WRAS-compliant bullet is not an approval number with an expiry date. A 5.0 from two ratings is not a stronger UK result than 4.2 from 86 reviews. Do not add the two Felenny counts together.
The first cut is the system. A loft cold tank plus a hot cylinder is gravity-fed and can use a shower pump such as the Bristan ST PUMP15TN, if the head matches a measured flow. A combi or an unvented cylinder is mains-fed. A gravity shower pump does not belong on a combi as a default. Follow the exact pump’s limits and the water undertaker. Measure with a jug before you pick positive head or universal. Salamander’s positive-head pumps need 2 litres per minute at each pumped outlet.
UK mains are 230 V and a household plug is BS 1363. The Bristan spec says 230 V AC. The BritTherm table says 230 V and a bullet says 240 V, with a UK-plug cable claimed rather than an approval. The KATSU 260 W spec says 220 V and the pump comes without a plug, so it needs a competent connection, and the listing says it is not self-priming. A dry run may damage the seal and impeller. The Felenny and Gugxiom pumps are 24 V.
Three typical situations, each with a recommendation from this comparison.
You have a loft cold tank and a hot cylinder, and a mixer shower needs both sides boosted. The Bristan ST PUMP15TN is a 1.5 bar twin with 15 mm push-fit hoses and a fixing kit. Measure the flow first. The listing does not say positive or negative head.
You want a household booster nearer £70 than £200, and you can prime the pump and arrange a safe electrical connection. The KATSU 260 W is about £69.99 with 3.9 from 178 reviews. It arrives without a plug, the spec says 220 V, and it is not self-priming.
You are boosting a single compatible outlet, not balancing a mixer. The Gugxiom 100 W 24 V is about £38.99, with a power supply in the box and UK reviews that mention a washing machine and a hot tap. Confirm the electrical arrangement before you fit it in a wet place.
Match the pump to the system before you compare watts. For a compatible gravity-fed mixer shower, the Bristan ST PUMP15TN is the top pick: 1.5 bar, twin impeller, 15 mm push-fit and a fixing kit, about £200.68, with 4.2 from 86 reviews. It is not the default on a combi or a direct mains supply, and the listing does not state positive or negative head. If you want a lower price on a gravity-fed job you can prime, the KATSU 260 W booster is the best value at about £69.99, with the largest review count here and a clear warning: no plug, 220 V in the spec, and not self-priming. Inline 24 V pumps suit one outlet only after the supply is confirmed. None of these eight listings was lab-tested, and a WRAS-compliant bullet is not treated as an approval.
KATSU 260W booster
About £69.99 with 3.9 from 178 reviews on gravity-fed showers, if you can prime it and connect a pump that arrives without a plug.
Editorial
Peter F. is the editor for DIY & tools at productscompared.co.uk. Comparisons in this category are checked against amazon.co.uk listings, review evidence and public UK sources.
Guides on what to look for, how to use a product, and common mistakes.
Public UK sources and the amazon.co.uk listings in this comparison, retrieved on 15 October 2026.
This page contains affiliate links to amazon.co.uk. If you buy through them, we may earn a commission at no extra cost to you. Prices, stars and review counts are the UK listing figures in this comparison. We did not lab-test these pumps.
