Guide
Are boiling water taps worth it?
For some kitchens, yes: boiling water on demand saves the wait and frees the worktop. But a boiling tap costs far more up front than a kettle, needs cupboard space, a socket and a fitter, and uses a little electricity all day. Whether it pays off depends on how often you boil water and what that convenience is worth to you.
The short answer
A boiling tap is mostly a convenience purchase. It does not obviously save money: a kettle that boils only what you need is efficient, and the tap adds an up-front price and standby electricity. It earns its place where you boil water many times a day, where worktop space is tight, or where you simply want instant hot water and will use it. If you boil a few cups a day and have a kettle you like, a boiling tap is hard to justify on cost. Prices in detail are in how much a Quooker tap costs.
How a boiling tap works
A boiling tap draws cold water from the mains into an insulated tank in the sink cupboard, keeps it hot on mains electricity, and delivers it from a tap on the worktop. The Quooker PRO3 installation guide describes a 3 litre tank that stores water at about 108°C. The tank is why these taps need cupboard space, a socket and a plumbing connection.
Tap or kettle?
| Consideration | Boiling water tap | Kettle |
|---|---|---|
| Up-front cost | Hundreds to over a thousand pounds, plus fitting. | A small fraction of that. |
| Speed | Boiling water on demand. | A short wait each time. |
| Worktop space | None, but the tank takes cupboard space. | A kettle stays on the worktop. |
| Electricity | Standby all day, plus heating what you draw. | Only when you boil, and only what you fill. |
| Hard water | Scale builds up inside; the maker sets descaling and parts. | You descale it, or replace it. |
| Fitting | A plumber or the maker’s installer. | None. |
What it costs to run
The tap’s running cost has two parts: keeping the tank hot, and heating the water you draw. Quooker’s UK consumer brochure gives a standby figure of 10 W for the PRO3, PRO7 and COMBI. Over a year that is 87.6 kWh, which at an assumed 30p a kWh comes to £26.28. That is standby only: it leaves out the water you actually draw. The rate is our assumption, not a current average, and the brochure is an older manufacturer document, not our measurement.
| Tap | Standby figure | Per year | Rate used | Cost per year |
|---|---|---|---|---|
| Quooker PRO3, PRO7 and COMBI | 10 W (brochure figure) | 87.6 kWh | 30p per kWh, our assumption | £26.28 |
| Qettle 4 litre | 0.15 kWh a day (maker’s estimate) | 54.75 kWh | 28p per kWh, the maker’s example | £15.33 |
The figures show the scale of the standby cost, not a verdict. A kettle used for a few cups a day uses electricity only when it boils. Neither maker’s figure shows that one costs less to run than the other for your household, so do not read a saving into them.
Space, fitting and hard water
- Cupboard space. Measure the clear space under the sink, including room to reach the tank and its connections. The under-sink guide shows how to measure a cupboard, and the same care applies here.
- Socket and plumbing. The PRO3 manual describes a mains water connection and a mains electricity connection. Fitting is for a qualified installer who will check your pipework and the regulations.
- Hard water. The manual recommends descaling more often in hard-water areas and lists HiTAC as recommended every 3 to 5 years. If limescale is a worry, read hard water and limescale first, and price the upkeep as you would a filter’s replacement cartridges.
- Filters and treatment. The PRO3 manual says not to connect the tap to reverse osmosis or to pH-reducing softeners. Check the manual for your exact model, because restrictions differ. How reverse osmosis differs from an ordinary filter is in the reverse osmosis guide.
Safety
Water at near-boiling temperature can scald. Quooker’s taps use a double push-and-turn action and an insulated spout, which reduce the risk but do not remove it, and neither is a guarantee that a child cannot be hurt. If young children use the kitchen, treat the tap as you would a kettle or a hob and follow the maker’s safety advice.
Two makers compared
Quooker and QETTLE both offer boiling taps with tanks fitted below the sink. Their starting prices cover different tap functions and tank options, so they are not like-for-like packages. These are the makers’ own figures, read on 16 October 2026; we have not tested either product.
| What the maker states | Quooker PRO3 | Qettle Original |
|---|---|---|
| Starting price | From £1,050 (Nordic, chrome, with PRO3 tank), list price including VAT, July 2026 | From £545 |
| Tank size | 3 litres | 2, 4, 7 litre configurations |
| Water temperature | 100°C boiling water at the tap; stored at about 108°C in the PRO3 manual | 100°C boiling water at the tap |
| Standby | 10 W (brochure) | 0.15 kWh a day for the 4 litre tank (maker’s estimate) |
| Warranty | Not covered here | 2 years |
| Plumbing | Mains water and mains electricity; fitted under the sink | Tank fitted below the sink; mains water and electricity needed |
The Qettle’s “from” price is for its cheapest configuration, so check the exact tank size and options on the maker’s page. Its maker estimates standby use for the 4 litre tank at 0.15 kWh a day; that is the maker’s estimate, not an independent test. See the Qettle FAQs.
When it is worth it, and when it is not
- More likely worth it: you boil water many times a day, worktop space is tight, you are already refitting the kitchen, and you accept the up-front cost and the upkeep.
- Less likely worth it: you boil a few cups a day, you rent, the cupboard is cramped, or you are buying only to save on electricity.
- Worth pricing both ways: add the list price, a written fitting quote, the upkeep and the standby electricity, then set that against a kettle over five years. The running-cost calculator does the five-year sum for a filter, and the same approach works for a tap.
If your main aim is better-tasting drinking water, a filter may meet that need at a lower up-front cost. See are water filters worth it?, and compare specific systems in the under-sink comparison.
Sources
- Quooker: UK price list, July 2026 (PDF)
- Quooker: PRO3 installation guide (PDF)
- Quooker: UK consumer brochure (PDF)
- Qettle: Original
- Qettle: FAQs
Manufacturer documents read on 16 October 2026; prices and specifications change. General information, not installation advice. How we check.