How much does it cost to run a boiling water tap? And how much electricity do they use?

We calculated the cost of running a boiling water tap to see if the investment pays off

Matte black boiling water tap on white sink next to red plant
(Image credit: Future PLC)
Recent updates

This article has been updated to show the new cost to run based on the January Energy Price Cap. It has also been fact-checked and any out-of-date information removed. 

The prospect of instant boiling water on demand is a good enough reason to consider investing in a boiling water tap, but pair this with the promise of reduced energy bills and it's hard to find an excuse not to. But it's helpful to know how much does it cost to run a boiling water tap so you can know for sure whether or not you'll save money in the long run. 

The best boiling water taps have become an increasingly popular addition to kitchens across the nation. Those who have invested have waved goodbye to standing around and waiting for the kettle to boil, but more significantly, they've enjoyed the benefits of reduced energy bills too. 

'For those looking to invest, hot taps can provide long term savings as energy costs continue to rise', says Paul Bailey, Leader, Product Management, GROHE UK. 'Hot taps are an energy-efficient, convenient, and safe way to enjoy kettle-hot water on demand.'

Hot water taps are also better for the planet too, as they provide households with the exact amount of water they need and prevent any being wasted, something we discuss in our feature on hot water taps vs hot water dispensers. So there's a lot to be said for adding one of these appliances to your home, but the question is, how much does it cost to run a boiling water tap?

Matte black boiling water tap on white sink next to red plant

(Image credit: Quooker)

How much does it cost to run a boiling water tap?

We've asked the experts and done some calculations to find an up-to-date and accurate answer to how much does it cost to run a boiling water tap. If you're unsure where you stand in the boiling water tap vs kettle debate, the figures below might help you decide.

Silver instant boiling water tap on white kitchen countertop with wooden cabinets

(Image credit: Quooker)

To work out how much does it cost to run a boiling water tap, it's helpful to first look at how much electricity does a boiling water tap use.

Quooker created the original instant boiling water tap, and they have an array of taps that require very little electricity to work ranging from 1600 watts to 2200 watts. There may be a slight variation in how much electricity a tap uses depending on the model and brand; for example, a GROHE Red tap uses 0.74 kWh to boil 3 litres of water per day (an approximation of the average UK household's water consumption). 

To demonstrate how little a boiling water tap can cost to run we've based it on a 1600-watt tap and used the current price per kilowatt hour of electricity set by the energy price cap which is 29p.

  • A 1600-watt boiling water tap costs 46p to boil 3 litres of water. With the average UK household consuming around 3 litres of water per day, a boiling water tap used every day would cost £168 over a year.  

Are boiling water taps cheaper to run than kettles?

Gold boiling water tap on white countertop in orange kitchen

(Image credit: Quooker)

Boiling water taps use less energy and therefore cost less to run than the best kettles. According to the experts at Quooker, the cost of boiling a full kettle (typically holding 1.5L) is 2.5p per boil.

So if you were wondering how much does it cost to boil a kettle for a cup of tea, it will be more expensive than using an instant hot water tap. There's potential to save even more pennies using a tap because you can put the water directly into your cup, so there won't be any wasted - which can sometimes happen when filling up the kettle. 

Is it expensive to have a boiling water tap?

Silver boiling water tap being used to add water to a cup of coffee

(Image credit: GROHE)

Boiling taps are cheap to run, but it's important to factor in the upfront cost and installation price. In the short-term, it's cheaper to buy a kettle than to purchase and install a boiling water tap, but keep in mind that they will save money on your energy bills in the long run. 

'The cost of a Quooker installation is £99 if a tap and tank are purchased together. This should be done by an official Quooker installer', says Stephen. 'There are optional accessories including cold water filters, scale control, power switches that equally distributes energy between appliances, however all of these are not essential and the tap and tank can be purchased without.'

Because of how cheap Quooker taps are to run, the investment would soon pay off. One cup of tea for example costs only a fifth of a pence to make (£0.002) - meaning you could have 6 cups of tea for the same cost of boiling 1 cup of tea from the kettle. 

Should I turn off boiling water tap at night?

'For most boiling water and kettle-hot taps, it is unnecessary to switch them off overnight, however it can help to bring down your energy consumption slightly', explains Adam Logan, Training Manager, GROHE UK & LIXIL EMENA. 

'The GROHE Red doesn’t need to be switched off overnight, as it is incredibly well insulated and made of Titanium which aids fast reheating and prevents the build up of Limescale. As the GROHE Red doesn’t keep the water at a permanent 99°C, it allows for the temperature to drop to as low as 90°C.' 

Turning off your hot water tap at night won't make a huge difference to your energy bills, but it can help lower them slightly. It makes sense to turn off your hot water tap when you're away on holiday, as it won't be being used for a prolonged period. Turning it off at night takes minimal effort and will save a few pounds over the course of the year.

Katie Sims

Katie Sims has been writing for Ideal Homes since spring 2022. She qualified from her Master’s in Media and Journalism in 2021 and has been writing freelance since. She has worked on Ideal Home’s ecommerce team where she researched the best home products on the market, and on the news team, researching the latest trends for feature pieces.