We analysed the Amazon.co.uk subcategory Filter Taps and kept only products with at least 200 reviews and 4.3 stars. Just 30 listings exist in the whole subcategory, and the revenue top ten shows how thin that is: £645 boiling water taps sit next to two replacement cartridges, a bare faucet with no filter in it and a £6.89 tap for a garden water butt.
The revenue leader and the only entry here you can fit yourself: it clamps onto the spout you already have, and the price fell 39% over the observed period.
Check the price on AmazonThe revenue leader and the only entry here you can fit yourself: it clamps onto the spout you already have, and the price fell 39% over the observed period.
A full tap replacement with a boiler under the sink: boiling, filtered cold and mains hot and cold from one spout, at £620 and six units a month.
The gold finish of the same Qettle at £645, the highest price in this comparison, and up 30% over the observed period.
The black version at the same £645 — three of the ten places here are one Qettle in different finishes, sharing a single pool of 682 reviews.
A cartridge rather than a tap: the X-Guard refill for the Philips on-tap system, rated at 1,200 litres and claiming to remove up to 99% of bacteria.
A dispensing faucet with no filter inside it: solid brass with a high spout, made to sit alongside a reverse osmosis unit you already own.
The most reviewed listing here at 4,077, and the middle way: a countertop unit that needs no plumbing at all, rated for 8,000 gallons.
The second Philips cartridge in this top ten and the plainer microfiltration version at £8.49 — again a refill, not a tap, and up 34% in the period.
The cheapest entry here at £6.89, and it filters nothing: a plastic replacement tap for a rain barrel or a home brew container.
The same ON TAP V as rank 1 in white and £13 more, shipped from a Spanish seller, with fourteen units a month behind it.
| Product | Score | Stars | Reviews | Feature | Material | Price | Offer |
|---|---|---|---|---|---|---|---|
| 01. BRITA ON TAP V Water Filter, 4 Months Best seller Brita · BRITA |
9.2 | 4.6 ★ | 1,817 | clamps on · 4 mths | Plastic | £19.99 | Amazon › |
| 02. QETTLE 4-in-1 Instant Boiling Water Tap Qettle · Qettle |
8.7 | 4.5 ★ | 682 | boiling tap · 4-in-1 | Stainless steel | £620.00 | Amazon › |
| 03. QETTLE Original 4-in-1 Boiling Tap, Gold Qettle · Qettle |
8.7 | 4.5 ★ | 682 | boiling tap · gold | Stainless steel | £645.00 | Amazon › |
| 04. QETTLE Original 4-in-1 Boiling Tap, Black Qettle · Qettle |
8.7 | 4.5 ★ | 682 | boiling tap · black | Stainless steel | £645.00 | Amazon › |
| 05. Philips X-Guard On-Tap Filter AWP315 PHILIPS · Philips |
8.7 | 4.4 ★ | 1,078 | cartridge · 1200 L | Plastic | £20.99 | Amazon › |
| 06. iSpring GA1-B Brass Filter Faucet, Chrome iSpring · iSpring |
8.7 | 4.4 ★ | 1,216 | faucet only · brass | Solid brass | £35.99 | Amazon › |
| 07. Waterdrop 5-Stage Countertop Water Filter Waterdrop · Waterdrop |
9.1 | 4.4 ★ | 4,077 | countertop · 5-stage | Stainless steel | £84.99 | Amazon › |
| 08. Philips On-Tap Filter Cartridge AWP305 PHILIPS · Philips |
9.1 | 4.4 ★ | 4,021 | cartridge · 1000 L | Plastic | £8.49 | Amazon › |
| 09. LAMXD Water Butt Replacement Tap, BSP Lowest price LAMXD · LAMXD |
9.0 | 4.6 ★ | 1,180 | water butt · plastic | Plastic | £6.89 | Amazon › |
| 10. BRITA ON TAP V Filter Tap, White BRITA · BRITA |
8.8 | 4.4 ★ | 1,283 | clamps on · white | Plastic | £32.99 | Amazon › |
The BRITA ON TAP V grips the spout you already have and takes five minutes; the Qettle replaces the tap, needs a boiler in the cupboard and, for most people, a plumber. Between £19.99 and £645 there is nothing in between in this top ten, so decide which side of that line you are on first.
Two entries here are replacement cartridges and one is a bare brass faucet designed to dispense water from a reverse osmosis unit you must already own. A tap-shaped photograph in this subcategory is not proof of a filter, and none of those three will improve your water on their own.
A boiling water tap needs a boiler roughly the size of a small kettle in the cupboard, a socket to run it from and the mains hot and cold feeds within reach. Measure the cupboard and find the socket before you fall in love with the spout, because that is what turns a fitting into a job.
The clamp-on BRITA is sold in four-month terms; the Philips cartridges are rated at 1,000 and 1,200 litres; the countertop unit claims 8,000 gallons. Over five years the refills for an on-tap filter cost several times the £19.99 housing, which is the number that actually decides this purchase.
The Qettle taps are sold as true boiling rather than the 98 degrees that many instant taps deliver, which is the point if you want it for tea. It also means genuinely boiling water at handle height, so the child lock and the handle action are worth as much attention as the finish.
If you rent, or the cupboard is full, the Waterdrop sits on the worktop and connects to the spout without touching the plumbing. You pay for it in worktop space and a hose across the sink, but it is the only option here that filters properly and moves house with you.
Because Amazon filed it here. The LAMXD listing is a plastic replacement tap for a rain barrel or a home brew container, with a BSP thread and a snap-fit connector, and no filtration of any kind. It clears our review and rating filter, so it appears — we would rather flag it than quietly drop it and pretend the subcategory is tidier than it is.
For the BRITA ON TAP V, no: it clamps to the existing spout, though it only fits certain spout shapes and will not go on a pull-out or a very slim tap. For the Qettle, almost certainly yes — you are replacing the tap, mounting a boiler under the sink and giving it a socket. The countertop Waterdrop needs neither.
They are finish and boiler variants of one tap, sold on separate ASINs at £620 and £645, and they share a single pool of 682 reviews. Between them they take three of the ten places in this ranking, which tells you as much about how thin the subcategory is as it does about the tap.
The products are ordered by estimated monthly revenue per ASIN, not by star rating and not by bestseller rank. Only products with at least 200 reviews and an average of 4.3 stars were included. With only 30 listings in the whole subcategory and single-figure monthly sales on the expensive taps, small changes here move the order a long way — read it as a map of a small market, not as a verdict.
The score is not our own hands-on test. It is calculated transparently from public Amazon data: 75% from the average star rating and 25% from the number of reviews, weighted logarithmically. The ranking order itself comes from estimated monthly revenue per ASIN. Prices, ratings and review counts were retrieved from Amazon.co.uk on 22 July 2026 and can change at any time.
Affiliate disclosure: As an Amazon Associate we earn from qualifying purchases — at no extra cost to you. All links are affiliate links. Prices are snapshots taken on 22 July 2026; the current price is shown live on Amazon. Product images and details come from Amazon or the manufacturers.