Handwash water heater or kitchen water heater
Updated: 17.10.2026
You are looking at one product photo and two rooms. A handwash water heater or kitchen water heater is not the same purchase, and a shower head in the box does not add a third. A cloakroom spout can live on 3 kW. A washing-up bowl wants stored litres or a much larger element. A shower is another appliance. Prices are the amazon.co.uk listings of 15 October 2026 on the [point-of-use water heater comparison](/hub/hot-water/point-of-use-water-heater). We did not run a lab test. A qualifying purchase can earn a commission at no extra cost to you.
You are looking at one product photo and two rooms. A handwash water heater or kitchen water heater is not the same purchase, and a shower head in the box does not add a third. A cloakroom spout can live on 3 kW.
You are looking at one product photo and two rooms. A handwash water heater or kitchen water heater is not the same purchase, and a shower head in the box does not add a third. A cloakroom spout can live on 3 kW. A washing-up bowl wants stored litres or a much larger element. A shower is another appliance. Prices are the amazon.co.uk listings of 15 October 2026 on the point-of-use water heater comparison. We did not run a lab test. A qualifying purchase can earn a commission at no extra cost to you.
Our top picks
| Badge | Product | Room | Power | Limit | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  COMFEE' COMFEE' 10 L undersink | Kitchen or garden sink | 2 kW store | 10 litre bowl | 9.6 | about £79.99 | View offer |
| Preis-Tipp |  Triton Showers Triton T30i handwash | Cloakroom basin | 3 kW instant | Lukewarm for a bowl | 9.0 | about £55.99 | View offer |
| Alternative |  Stiebel Eltron Stiebel Eltron DCE-X 10/12 Premium | Sink if the circuit exists | 10/12 kW | Not a 13 A plug | 9.0 | about £412.86 | View offer |
On this page
A cloakroom or workshop basin
A cloakroom, toilet, workshop or garage needs a short warm wash on cold mains. Triton’s sheet for the T30i describes that list, not a kitchen. The unit is 3 kW and instantaneous, with IPX4, a 1 bar minimum and a 10 bar maximum on the maker’s sheet. On amazon.co.uk it is about £55.99 and averages 4.4 from 842 reviews. Buyers use it in sheds and cloakrooms and complain when they expected hot kitchen water. The comparison treats it as the best value in the set for this basin.
Triton’s article talks about handwash around 41°C. That is guidance in the article, not a Building Regulations maximum for basins. The 48°C figure applies to a fixed bath in a new dwelling. A 3 kW element adds about 21°C at 2 litres a minute and about 5°C at 8 litres a minute, as a calculation, which is why 8 litres per minute on the listing is not a hot flood. A 3 kW instant unit can wash hands if you accept a gentle flow. It feels underpowered as soon as you put a bowl under it.
A kitchen, utility or garden-room sink
A sink is a volume. Grease wants hotter water than a handwash, and a bowl is several litres at once. AquaHot’s note on single-sink units makes the same split: occasional handwash can be instant, and dishwashing wants storage because the instant unit cannot supply the volume. Heathfield’s rule of thumb is about 10–15 litres stored, or 6–12 kW if you insist on instant heat. The stored fits here are the COMFEE' 10 litre heater at about £79.99 and the Ariston Andris R 15 litre heater at about £133.19.
COMFEE' reviewers describe washing-up in a holiday home or garden-room kitchen, at 4.7 from 21 ratings, with one failed unit in the file. The case is 30 cm deep. Andris reviewers describe an annexe and a staff sink, with one report of rust after three months. A garden room follows the kitchen rule if you wash up there, and the cloakroom rule if you only rinse hands. A 6 kW instant heater can be argued from a rise of about 29°C at 3 litres a minute, but the Normodic and laloohome pages have no reviews. The Stiebel DCE-X, at 10/12 kW and about £412.86 before the circuit, is the listing reviewers use on a kitchen sink once the cable exists. Storage versus instant is on the undersink or instant page.
A shower is a different appliance
A shower head in the box is not 9 kW of heat. The Mulcort listing mentions a shower head in a bullet, at 3,000 W, while the components line lists a user manual, and there are no reviews. At a shower flow, 3 kW cannot hold a comfortable temperature.
The Stiebel title does say showers, and the 116 reviews at 4.4 disagree. Some households report a usable shower. Others say the flow collapses. Stiebel’s UK FAQ says this single-phase class is not for filling a bath. Treat the Stiebel as a conditional case only after an electrician has seen the consumer unit. HSE guidance still asks for 50–60°C in a store of 15 litres or less. If you store a sink that hot, mix down for children and older people. That is scald protection. It does not turn the tank into a shower. Fitting stays on the install guide.
Which listing to open
Open the Triton T30i for a cloakroom, workshop or shed basin, and leave it if the next job is washing-up. Open the COMFEE' or the Andris R for a kitchen or garden-room sink, if the cupboard can take about 30 cm of depth or a 38.5 cm height. Open the Stiebel DCE-X only for on-demand heat at a higher flow, with the new circuit priced in. Leave the FVSTR until a nameplate says 230 V, because the specification says 120 V.
A bath is outside this category. Stiebel’s FAQ says this single-phase class is not a bath filler, even at 10/12 kW. The same three fits are on the best point of use water heater page. If the room is clear and the circuit is not, the buying guide holds the litre and amp thresholds.
Common questions
Can one heater do a basin and a kitchen?
Not well, if you mean one 3 kW instant unit for both. The Triton can look after the basin. The kitchen bowl will find it lukewarm, which is what reviewers say when they expected washing-up heat. Two outlets also push you towards a stored tank near the sink, and a long pipe wastes the heat. Fit the heater for the harder job, or fit two.
Will a Triton T30i wash up?
It will take the chill off a rinse, and it will not fill a bowl with hot water at a useful flow. The listed 8 litres a minute is not a hot-water claim at 3 kW. Cloakroom buyers are broadly content. Buyers who wanted a kitchen are the ones calling it lukewarm. Use a 10 or 15 litre store for washing-up.
How hot is handwash water supposed to be?
Triton’s article uses about 41°C as a handwash idea. That is not the 48°C bath limit for a new dwelling, and it is not the 50–60°C HSE range for storing water in a tank of 15 litres or less. Store hot, then mix down at the tap if children or older people use the basin. A 3 kW instant heater often never gets there once the tap is open wide.
What should I buy for a garden-room sink?
Match the sink, not the shed. If you wash up, use the COMFEE' 10 litre or the Andris 15 litre, if the cupboard and a sensible circuit exist. COMFEE' reviewers already mention garden-room kitchens. If the room only has a hand basin, the Triton at about £55.99 is the fit, and you do not need a 15 litre tank. A shower there is a separate circuit.
Can a 3 kW unit with a shower head run a shower?
No. The Mulcort bullet lists a shower head on a 3,000 W heater with no reviews, and the components line does not even agree the head is included. Three kilowatts at a shower flow adds only a few degrees. Ignore the accessory and size the heater for the water you need. A shower is not this 3 kW group.
When is 10 or 15 litres the kitchen choice?
When you want one bowl now and can wait for the next. Ten litres is the rule-of-thumb bowl, which is the COMFEE'. Fifteen litres is the Andris R, with about 18 minutes on Ariston’s heat-up figure and a higher price. Choose litres when you will not install a 6–12 kW circuit. A cheaper 3 kW instant title is still the wrong tool for that bowl.
Is a bath in scope at all?
No. Filling a bath needs a store far outside this set. Stiebel’s FAQ says this single-phase instant class is not for filling a bath, even at 10/12 kW. A 15 litre tank is a sink. If the job is a bath, leave this category rather than stretch a handwash or a marketplace 3 kW box.
Related pages
Sources
Public UK sources used for this comparison. Listing prices, stars, and review counts are from amazon.co.uk extracts dated 15 October 2026.
- Approved Document G, with 2024 amendments (retrieved 15 October 2026)
- Approved Document P, 2013 (retrieved 15 October 2026)
- Water Supply (Water Fittings) Regulations 1999 (retrieved 15 October 2026)
- HSE HSG274 Part 2 (retrieved 15 October 2026)
- IET Wiring Matters, September 2025 — 3 kW and BS 1363 (retrieved 15 October 2026)
- Retained regulation 812/2013, Annex II (retrieved 15 October 2026)
- Ariston Andris Lux, UK (retrieved 15 October 2026)
- Stiebel Eltron — instantaneous versus stored water heaters (retrieved 15 October 2026)