Are Boiling Water Taps Worth It in Ireland? Running Costs, Installation and What to Check
Aug 28, 2026
Are Boiling Water Taps Worth It in Ireland? Running Costs, Installation and What to Check
A boiling water tap does something a kettle cannot: it gives you filtered water at up to 98°C in about two seconds, from a lever on your kitchen tap, without a bulky appliance sitting on the worktop. That much is easy to like. The harder question is whether it earns its place in an Irish kitchen, and nobody selling one tends to answer that with actual figures.
So this guide does the sums. What it costs to run at Irish electricity prices, how that compares to the kettle you already own, what your kitchen needs before one can be fitted, and where these taps genuinely do not suit — including a plumbing setup that is still very common in older Irish houses.
No sales pitch until the end, and no pretending the numbers are better than they are.
The quick verdict
If your kettle goes on five or six times a day, a boiling water tap will save you money on electricity and a genuine amount of time. If it goes on twice, it will not — and you should keep the kettle.
That is the whole answer, and the rest of this page is the working behind it. The energy saving is real but modest: roughly €60 a year against the very common habit of filling the kettle to the top for one mug of tea, and closer to €18 a year if you already fill it carefully. What you are actually buying is the two seconds instead of the three minutes, and the appliance off the counter.
A boiling tap makes sense if:
- Tea and coffee happen all day, not just morning and evening
- Worktop space is tight and the kettle is in the way
- You have mains or combi pressure, not a hot press cylinder
- There is a socket in the sink cupboard, or one can be added
Stick with the kettle if:
- You boil water a handful of times a week
- Your sink cupboard is already full of pipework and bins
- You are on a gravity-fed system and not changing it
- You would resent a filter change two to four times a year
What a boiling water tap actually is
It helps to stop thinking of it as a tap. It is a small water heater that happens to be operated by a tap, and understanding the three parts explains almost everything else — the cost, the installation, and the maintenance.
Cold water comes off the mains and passes through a carbon filter mounted on the cupboard wall. From there it enters an insulated tank sitting on the base of the cupboard, where a heating element holds it at whatever temperature you have set. When you pull the boiling lever, water leaves the top of the tank and comes out the spout immediately, because it was already hot. Cold mains refills the tank behind it.
The second lever is an ordinary hot-and-cold mixer, plumbed the way any kitchen tap is. That is why these are sold as 3 in 1 taps: boiling, hot, cold, one spout, one tap hole.
Two consequences follow from that layout, and they are the two things most people find out too late. The tank needs a plug socket, and the tap needs mains-level water pressure. Both are covered further down.
What a boiling water tap costs to run in Ireland
This is the question everyone asks and almost nobody answers with numbers, so here are the numbers.
Irish domestic electricity in 2026 sits roughly between 32c and 42c per kWh depending on supplier, plan and whether you are on a day/night meter. Money Guide Ireland put a typical unit at around 35c including VAT in spring 2026, with Electric Ireland's standard rate at 34.75c. We have used €0.35 per kWh throughout. Your own rate is on your bill, and every figure below can be rescaled by dividing by 0.35 and multiplying by yours.
The annual comparison
Take a household that makes six hot drinks a day — 2,190 mugs a year, which is an ordinary family or a couple working from home. Water in from the mains at about 10°C, heated to boiling.
| Method | Energy per mug | Electricity per year | Cost per year at 35c |
|---|---|---|---|
|
Kettle filled to the top 1 litre boiled for one mug |
0.12 kWh | 263 kWh | €92 |
|
Kettle filled carefully 500ml, about the practical minimum |
0.06 kWh | 131 kWh | €46 |
|
Boiling water tap 250ml drawn, plus standby all year |
0.028 kWh | 61 kWh + 19 kWh standby | €28 |
So the saving is about €64 a year against the overfilled kettle, and about €18 a year against a disciplined one. Not nothing, and not life-changing either.
Where these numbers come from, so you can check them. Heating water takes 4.186 kJ per litre per degree. A 250ml mug from 10°C to 98°C is 0.026 kWh; allowing for tank losses, call it 0.028. A litre from 10°C to 100°C is 0.105 kWh, and no kettle is perfectly efficient, so 0.12 is realistic. Standby is the manufacturer's published 2.2W figure for the tank used here — 2.2W × 8,760 hours = 19 kWh. Treat that standby line as a best case: a tank in a cold cupboard, or one left set to 98°C rather than 90°C, will use somewhat more.
One running cost is not electricity. The carbon cartridge needs replacing two to four times a year, and that is a real line in the budget rather than an optional extra — see the hard water section below for why skipping it is a false economy.
So does it ever pay for itself?
Be honest with yourself here. Divide the purchase price by €64 and you get the payback in years, and for most households that is a number in the mid single digits. If you already fill the kettle carefully, the electricity saving alone will never pay for the tap.
Which is why the energy argument should not be the reason you buy one. The reason is that boiling water arrives in two seconds instead of three minutes, several times a day, and the kettle stops taking up a corner of the worktop. If those two things are worth it to you, the modest electricity saving is a bonus rather than the case.
Boiling water tap vs kettle: the honest comparison
| Boiling water tap | Electric kettle | |
|---|---|---|
| Wait | About two seconds | Two to three minutes |
| Worktop | Nothing on it | Kettle, and usually a filter jug too |
| Temperature control | Set anywhere from 75°C to 98°C — green tea, baby bottles, French press | 100°C, unless you have a variable model |
| Filtered water | Built in, on the boiling side | Separate jug |
| Volume in one go | Around ten mugs from a 2.4 litre tank, then it reheats | Whatever the kettle holds, then two minutes again |
| Upkeep | Cartridge two to four times a year | Descaling, and eventual replacement |
| If it breaks | A repair or a guarantee claim; the mixer side still works | Buy another kettle |
| Portability | None — it is plumbed in | Take it anywhere there is a socket |
Plenty of people keep a kettle in a press for Christmas, when eight people want tea at once and a 2.4 litre tank has to catch up. That is a sensible thing to do and nobody should feel odd about it.
3 in 1, 4 in 1 or 5 in 1: which do you actually need?
The numbering counts what comes out of the spout, and it is worth knowing what you are paying for.
- 3 in 1 — filtered boiling, plus ordinary hot and cold. One tank, one filter, one tap hole. This covers what the vast majority of households want.
- 4 in 1 — the above, plus filtered cold water on the mixer side. Useful if you currently keep a filter jug in the fridge.
- 5 in 1 — adds chilled and sometimes sparkling water. This means a second unit in the cupboard, a CO2 cylinder in the sparkling versions, and a considerable jump in price.
The practical caution on 4 in 1 and 5 in 1 is cupboard space. An Irish sink cupboard usually already contains a waste trap, an isolating valve, a bin and whatever else has migrated in there. A single tank is around 330mm tall and 210mm wide; adding a chiller unit beside it is a genuine squeeze in a standard 600mm base unit.
If your main frustration is the kettle, a 3 in 1 solves it. If your main frustration is the filter jug taking up half a fridge shelf, look at 4 in 1. Chilled and sparkling are a want, not a need, and priced accordingly.
Will it fit? Five things to check before you order
This is the section that saves returns. Take a tape measure to the sink cupboard before you buy anything, and check these in order.
- Water pressure — check this first. Most boiling taps need a minimum of 1 bar and run best between 1 and 3 bar. If your hot water comes from a cylinder in the hot press fed by a tank in the attic, that is a gravity-fed system and it will not drive one of these properly. This setup is still very common in Irish houses built before the 2000s. A combi boiler or a pressurised (unvented) cylinder is what you want.
- A 13A socket in the cupboard. The tank plugs into an ordinary fused three-pin socket on a short cord — under a metre on most systems. If there is no socket under the sink, adding one is an electrician's job and often costs more than people budget for. Check before you order, not after.
- Cupboard height and width. A 2.4 litre tank is roughly 330mm tall, 210mm wide and 224mm deep, and it needs to stand upright on the cupboard base with room to get a hand around the connections. Measure past the waste trap, not to it.
- Wall space for the filter. The carbon filter mounts on a bracket and needs a little over 300mm of clear wall inside the cupboard, plus room to unscrew the housing downwards when you change the cartridge.
- Tap hole and worktop. A 3 in 1 fits a single standard tap hole. Check the height too — a boiling tap is tall, around 358mm to the top on the systems we stock, so if there is a window sill or a shelf above the sink, measure the clearance before you fall in love with one.
Can you fit it yourself? The plumbing is a single-hole tap fit with flexible tails, and a competent DIYer who has changed a kitchen tap before can usually manage it. The electrical side is different: if you need a new socket in the cupboard, that is work for a registered electrician. Fitting a tap to an existing socket is fine. Adding the socket is not a DIY job.
Hard water, limescale and why the filter matters here
Ireland has a lot of limestone, and a lot of hard water with it. Uisce Éireann is straightforward about this: hard water is "very common in Ireland's drinking supply", it is not harmful to health, and they are not required to remove it. They do let you check your own supply zone by Eircode, which takes about a minute and is worth doing before you buy a boiling tap. Geological Survey Ireland also publishes a national groundwater hardness map if you want the bigger picture.
Why it matters more for a boiling tap than for an ordinary one: the tank holds water at 90°C-plus all day, and heat is what makes dissolved calcium come out of solution and bond to metal. That is the same process that furs up a kettle element, except the tank is the expensive part and you cannot take it to the sink and pour vinegar into it.
The carbon cartridge in front of the tank is what prevents this. It does two jobs at once — takes the chlorine taste out of mains water, and reduces the calcium and magnesium reaching the element. In a hard water area you are at the three-month end of the three-to-six month replacement window. In softer parts of the west you can usually go to six.
One thing not to do. If scale does appear around the spout, resist reaching for limescale remover or descaler — particularly on a matt black or brushed brass tap. Those finishes are coated, and descaler strips the coating unevenly across the whole surface, which looks far worse than the scale did. A damp cloth and a dry-off is the correct routine. Change the cartridge on schedule and the question never comes up.
Replacement cartridges for the systems we stock are sold as the inline water filter kit, which fits every boiling tap in the range regardless of finish.
Are boiling water taps safe with children in the house?
Fair question, and the honest answer is: safer than a kettle, but not childproof.
Three things work in your favour. The boiling side is a separate lever from the everyday mixer, usually marked with a steaming cup symbol, so it is not something anyone turns on by reaching across for a glass of water. That lever needs a deliberate two-step action — a button pressed or a catch released before it will move. And the flow is aerated rather than a solid stream, which cuts down splashback off the bottom of a mug or a sink.
Set against that, a kettle can be moved out of reach and a tap cannot. In a house with a toddler who can reach the worktop, the honest advice is the same as it would be for a hob: it is a hot thing at a fixed location, and it needs to be treated as one. Most parents find the deliberate lever action more reassuring than a full kettle of boiling water sitting at counter height on a flex, but you should make that judgement for your own kitchen rather than take a shop's word for it.
Chrome, matt black or brushed brass?
A boiling tap is tall — usually the tallest thing on the worktop — so the finish is a bigger decision here than it is on a low mixer. Three practical points rather than three style opinions.
Buying a boiling water tap in Ireland
Most people start by searching boiling water tap Ireland, instant boiling water tap or boiling tap Dublin, and quickly notice the range is wide. Premium brands sit well above a thousand euro fitted; mid-market systems land in the middle; and there is now a solid entry tier that does the same 3 in 1 job — tap, tank, carbon filter, adjustable to 98°C — for a fraction of it.
Three things worth checking whoever you buy from, because they are where the cheapest listings tend to cut corners:
- Is the tank actually included? Some listings price the tap alone and sell the tank separately, which is the entire cost of the system.
- Is the filter a standard part? Proprietary cartridges lock you into one supplier for the life of the tap. Push-fit inline cartridges do not.
- Where is the guarantee handled? A two-year guarantee administered in Ireland is a different proposition to one you claim against a warehouse abroad.
At IrishBath.ie you can browse our boiling water taps with the tank and filter supplied as one kit, nationwide delivery across Ireland and Dublin pickup available on stocked items. If a boiling tap turns out to be more appliance than you want, a conventional mixer does the everyday job well — the full kitchen taps collection is worth a look, and the black kitchen taps if the finish is what brought you here.
Recommended boiling water taps
All three are the same 3 in 1 system — 2.4 litre tank, carbon filter, adjustable 75–98°C, single tap hole — so the choice is finish rather than function.
Instant Boiling Water Tap — 3 in 1 Chrome
- Easiest finish to match an existing kitchen
- 2.4L tank and carbon filter supplied
- Adjustable 75–98°C, single tap hole
Instant Hot Water Tap — 3 in 1 Matt Black
- Hides water spotting in hard water areas
- Tap and cupboard tank both matt black
- Suits dark cabinets, black sinks and handles
Brushed Brass Boiling Tap — 3 in 1
- Warm brushed finish, not polished gold
- Pairs with brass sinks, handles and lighting
- Same tank, filter and temperature range
Inline Water Filter Kit — Replacement Cartridge
- The part to reorder every 3–6 months
- Fits every boiling tap in the range
- Housing, wall bracket and push-fit connectors
Frequently Asked Questions
Are boiling water taps worth the money?
For a household boiling the kettle five or six times a day, yes — you save roughly €60 a year in electricity against an overfilled kettle, and a great deal of waiting. For a household that boils water twice a day, no. The electricity saving alone will not pay for the tap, so buy one for the convenience and the worktop space rather than as an energy measure.
How much does a boiling water tap cost to run in Ireland?
Around €28 a year for a household making six hot drinks a day, at an electricity rate of 35c per kWh. That breaks down as roughly 61 kWh for the water drawn and 19 kWh keeping the tank hot, based on a published standby figure of 2.2 watts. A kettle filled to the top for every cup costs about €92 a year for the same drinks.
Is it cheaper to boil a kettle or use a boiling water tap?
The tap is cheaper, because it heats only what you draw. A 250ml mug from the tap uses about 0.028 kWh; boiling a full litre kettle for the same mug uses about 0.12 kWh. The gap narrows a lot if you already fill your kettle to the minimum mark — then you are looking at roughly €18 a year rather than €60.
How does a boiling water tap work?
Cold mains water passes through a carbon filter and into an insulated tank in the sink cupboard, where an element holds it at your chosen temperature — usually somewhere between 75°C and 98°C. Pulling the boiling lever releases water that is already hot, so it arrives in about two seconds. The other lever is an ordinary hot and cold mixer.
Do boiling water taps use a lot of electricity on standby?
Less than most people expect. The tank on a typical 2.4 litre system draws around 2.2 watts on standby, which is about 19 kWh over a full year, or roughly €6.75 at 35c per kWh. A tank in a cold cupboard or set to the highest temperature will use somewhat more than that.
Can I install a boiling water tap myself?
The plumbing is a single-hole tap fit with flexible tails, and a competent DIYer who has changed a kitchen tap before can generally handle it. The electrics are different. If there is no 13A socket in the sink cupboard, adding one is work for a registered electrician and should be priced before you order the tap.
Will a boiling water tap work with a gravity-fed hot water cylinder?
Usually not. Most boiling taps need a minimum of 1 bar and run best between 1 and 3 bar, and a cylinder in the hot press fed from an attic tank will not deliver that. This is worth checking first in any Irish house built before the 2000s. A combi boiler or a pressurised cylinder is what these taps are designed for.
How often do you change the filter in a boiling water tap?
Every three to six months, depending on how hard your water is. Hard water areas are at the three-month end. The cartridge protects the heating element in the tank as well as improving the taste, so it is not an optional extra — a spent filter lets scale bond to the element.
Are boiling water taps safe if you have children?
Safer than a kettle on a flex, but not childproof. The boiling side is a separate lever that needs a deliberate two-step action to open, and the flow is aerated to reduce splashback. That said, a tap cannot be moved out of reach the way a kettle can, so treat it like a hob: a hot thing in a fixed place.
What is the difference between a 3 in 1 and a 4 in 1 boiling water tap?
A 3 in 1 gives filtered boiling water plus ordinary hot and cold. A 4 in 1 adds filtered cold water on the mixer side, which replaces a filter jug. A 5 in 1 adds chilled and sometimes sparkling water, but that means a second unit in the cupboard and a much higher price.
Do boiling water taps get limescale in Ireland?
They can, because much of Irish water is hard and heat is what makes scale form. That is exactly what the carbon filter is there to prevent. You can check the hardness of your own supply zone by Eircode on the Uisce Éireann website, which tells you whether you should be changing cartridges every three months or every six.
How much boiling water do you get before it runs out?
A 2.4 litre tank gives roughly ten mugs in succession before it needs to reheat, which covers ordinary use comfortably. If you regularly fill large pans or make tea for a crowd, that is the one situation where people keep a kettle in a press as backup.
Where can I buy a boiling water tap in Ireland?
You can buy boiling water taps online from IrishBath.ie with the tank and carbon filter supplied together as one kit, nationwide delivery across Ireland and Dublin pickup available on stocked items.
