How Much Does It Cost to Run a Hot and Cold Water Dispenser in the UK? (2026)

Water coolers keep a tank of water hot and another cold around the clock. The hot side is the bigger draw, and the pair typically uses 300 to 600 kWh a year, more than many refrigerators.

A typical hot and cold water dispenser (150 W) costs £0.039 per hour, or about £4.74 per month at 4 hours a day in the UK. Average running cost

Electricity price region

Hours used per day

Wattage	Per hour	Per day	Per month	Per year
Low 100 W	£0.026	£0.11	£3.16	£38.43
Typical 150 W	£0.039	£0.16	£4.74	£57.64
High 500 W	£0.13	£0.53	£15.79	£192.14

Formula: watts ÷ 1000 × hours × price per kWh. Typical use is 4 h/day ≈ 219 kWh per year.

One hour of a hot and cold water dispenser (0.15 kWh) is the same electricity as

3.0hours of a fridge
3.3hours of a laptop
15hours of Wi-Fi
17hours of an LED bulb

Electricity per year at typical use, on a log scale: #53 of 95 appliances, from least to most.

In the UK, with electricity at 26.3p per kWh (source: Ofgem price cap 1 Oct–31 Dec 2026, 2026-10), a typical hot and cold water dispenser costs £0.039 per hour and about £57.64 per year at 4 hours a day. Each £1.00 of electricity buys roughly 25.3 hours of use.

How to lower the cost of running a hot and cold water dispenser

Turn off the hot tank if you rarely use it. It is usually a separate switch at the back.
Use a timer to switch the whole unit off overnight.
Keep it out of sunlight and away from the oven.

Frequently asked questions

How much does a water dispenser cost to run?

Around 30 to 50 kWh a month with both hot and cold enabled.

Does a water cooler use a lot of electricity?

More than people expect. It is comparable to a fridge because it never switches off.

Is it cheaper to boil a kettle than use the hot tap?

Yes if you use hot water occasionally. The dispenser wins only with frequent use.

Cost by region

US states

Canadian provinces

Related appliances

Use the generic electricity cost calculator · Which uses more? Take the quiz