- A 10-minute shower costs 32.9p on a 7.5 kW electric shower, 41.7p on 9.5 kW and 47.4p on 10.8 kW, at full power.
- Prices from the Ofgem price cap, 1 October to 31 December 2026: the average for England, Scotland and Wales is 26.32p per kWh by Direct Debit. Your region and tariff change it, so use the calculator below.1
- Last checked: 28 October 2026.
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How much does an electric shower cost per shower?
Costs for 5, 10 and 15 minutes at full power for three published shower ratings.
| Power | 5 minutes | 10 minutes | 15 minutes |
|---|---|---|---|
| 7.5 kW | 16.5p | 32.9p | 49.4p |
| 9.5 kW | 20.8p | 41.7p | 62.5p |
| 10.8 kW | 23.7p | 47.4p | 71.1p |
How to work out the cost
Multiply the power in kilowatts by the hours it runs, then by your electricity unit rate. If the power is in watts, divide by 1,000 first.
For example: 9.5 kW x 0.25 hours x 26.32p per kWh = 62.5p.1
That is the cost at full rated power. If a thermostat switches the appliance off once the room is warm, it uses less. Standing charges are paid whatever you use, so they are not part of the cost of switching it on.
Typical electric shower power
Mira lists electric showers at 7.5, 8.5, 9.0, 9.5, 9.8 and 10.8 kW, each with a minimum supply fuse (32 A for 7.5 kW, up to 45 A for 9.8 and 10.8 kW).2 Models are named only as examples of published ratings, not recommendations.
Mira says you will “need to ask a Part P registered electrician to assess your installation, as your current wiring and fuse may not be suitable.”2
Shorter showers cost less
An electric shower uses its full power while it runs, so time matters most: on 9.5 kW, 5 minutes costs 20.8p and 15 minutes 62.5p.
For a household with one 10-minute shower a day on 9.5 kW, that is £2.92 a week.
Next steps
1. Find your shower's kW rating on the unit or in its manual.
2. Time a typical shower.
3. Work out the cost with the calculator above (15 minutes = 0.25 hours).
Help with energy bills
If you are struggling with energy bills, check the help you may be able to get. These checkers are free and need no account.
Who these figures cover
The prices are from Ofgem's price cap for England, Scotland and Wales, 1 October to 31 December 2026.1 In Northern Ireland, use the unit rate on your bill in the calculator.
There is no VAT on household electricity in England, Scotland and Wales, and the rates above already reflect this.1 HMRC: “The temporary zero rate applies from 1 October 2026 to 30 June 2027.” The Budget on 28 October 2026 extended it from 31 March (announced; the legislation is due in early 2027). Gas stays at 5% VAT.4