United Kingdom · GBP
Electric Shower Running Cost Calculator UK
Enter your shower's operating power and minutes of use. See the cost per shower, add metered water costs where applicable, and compare another duration with the same settings.
Your shower estimate
Use average electrical input during the minutes entered. Include warm-up or run-on in your readings where relevant. Your inputs stay in this browser.
Include metered water costs
Use this only for water charges that change with usage. Enter the effective combined water and sewerage price per cubic metre of supplied water; fixed charges are separate.
The example uses 8.5kW, 10 minutes, 7 showers/week, 52 weeks and a 5-minute comparison. It turns water costs off and keeps your electricity price.
How much does a 5-, 10- or 20-minute shower cost?
Electricity cost = operating kW × minutes ÷ 60 × pence per kWh ÷ 100. An illustrative steady 8.5kW for ten minutes uses 1.4167kWh. At 26.32p/kWh it costs £0.3729 before rounding, or about 37p. Seven such showers a week over 52 weeks cost £135.72; the annual average divided by 12 is £11.31.
The table uses the dated Ofgem GB Direct Debit, single-rate reference for 1 October–31 December 2026. These are steady-power examples, not measured shower consumption. Water and fixed charges are excluded; changing the calculator does not change this reference table. Totals use unrounded amounts, so adding displayed rounded costs can differ by a penny.
| Operating power | 5 minutes | 10 minutes | 20 minutes |
|---|---|---|---|
| 8.5kW | £0.19 | £0.37 | £0.75 |
| 9.5kW | £0.21 | £0.42 | £0.83 |
| 10.5kW | £0.23 | £0.46 | £0.92 |
Use the power for your setting
An electric shower heats incoming cold water using its own elements. A mixer supplied with hot water from another heater, or a pump-assisted shower, needs a different energy calculation. The pump rating alone cannot represent hot-water heating.
The Triton Amore manual is a useful example of why the exact model matters. Page 7 lists its 8.5kW and 9.5kW nominal ratings at 240V alongside 7.8kW and 8.7kW at 230V. Use the applicable documented power or an existing suitable input-energy reading; this calculator does not measure supply voltage.
Pages 4 and 20–21 distinguish the power selector from the temperature dial. For that model, the elements run at the chosen power setting, while the temperature dial changes water flow. Eco uses one element and Max uses all elements; no universal Eco percentage is inferred here. Other models, including electronic controls, may behave differently. Follow your own operating instructions.
If your power varies during the session, use average input power across the entered minutes. For a complete-shower energy reading, the UK electricity calculator's Energy per use / load mode accepts kWh directly. Keep standby or other separately measured energy from being counted twice.
When water charges belong in the estimate
Water volume = average litres per minute × minutes. Usage cost = litres ÷ 1,000 × the effective £/m³ price. If your water supplier applies a return-to-sewer factor, combine the water price with only the applicable sewerage amount per m³ of supplied water. For example, invented rates of £2/m³ water plus £3/m³ sewerage charged on 90% of supplied volume give an effective £4.70/m³.
As a separate arithmetic example, 6 litres/minute for ten minutes is 60 litres. At an invented effective £5/m³, its water charge is £0.30. Added to the 8.5kW electricity example above, that is about £0.67 per shower. These are not average flow rates or water tariffs.
Water billing varies by location and supplier. Unmetered or fixed-only charges do not automatically fall when a shower is shorter. This tool excludes standing charges, surface-water drainage, installation, maintenance and energy used by other equipment. CCW's water-meter calculator for England and Wales addresses the wider question of switching to metered billing; our per-shower estimate cannot settle that decision.
Compare time without changing the assumptions
Enter another duration to compare the same power, flow and prices. Halving the time halves the modelled energy and water in that session. It does not establish savings from a different shower, temperature setting or shower head. A change in power or flow needs a separate estimate, and actual behaviour may differ.
Common questions
How much does a 10-minute electric shower cost?
At an illustrative steady 8.5kW and the October–December 2026 GB reference of 26.32p/kWh, ten minutes uses about 1.417kWh and costs about £0.37 in electricity. A steady 9.5kW would cost about £0.42 and 10.5kW about £0.46. Water charges are separate. Use your operating power and tariff; these are calculation examples, not measurements of your shower.
Does the temperature dial directly change electricity use?
It depends on the model and controls. The Triton Amore manual says its elements operate at a constant rate at the selected power setting, while its temperature dial varies water flow. It separately describes Max, Eco and Cold power settings. Do not assume turning the temperature dial alone reduces electrical input; use the instructions and input power for your model and setting.
Does Eco always mean half the rated power?
No universal fraction is used here. A setting name or element count does not by itself establish the exact input power for every model. Enter the documented or measured average kW for the setting you use. If you have complete-shower kWh instead, the UK general calculator can price that energy directly.
Are water and sewerage charges included?
Electricity is shown by default. Turn on metered water charges to enter flow in litres per minute and the effective usage charge in pounds per cubic metre of supplied water. Include applicable volumetric sewerage charges and any return-to-sewer adjustment in that effective rate. Fixed water, drainage and electricity standing charges are excluded. For an unmetered or fixed-only water bill, using less water does not automatically reduce the billed charge.
Can I use this for a mixer or power shower?
This tool is for a shower that heats cold water using its own electric heating elements. A mixer supplied from a boiler, cylinder or heat pump has a different hot-water energy boundary. The pump watts of a power shower do not include the energy used to heat its water. This calculator does not infer a gas-versus-electric saving.
How is the shorter-shower comparison calculated?
Only the entered minutes change. The comparison holds average electrical power, water flow if included, prices, showers per week and active weeks constant. It can show a shorter or longer duration. If a different setting changes power or flow, calculate that scenario separately. Annual cost uses your showers per week × active weeks; monthly cost is annual cost divided by 12.
Does leaving the isolator on use the full shower rating?
The heating-element rating applies while that heating load operates, not to every hour the electricity supply is available. This tool prices the operating minutes you enter; it does not estimate standby. Follow the manufacturer's operating instructions for switching the shower off. A complete energy reading can include other modes inside its measurement boundary.
Sources and checking your inputs
- Triton Amore installation and operating guide: power, voltage and controls (PDF, pages 4, 7 and 20–21)
- Ofgem electricity unit rates and standing charges
- CCW: metered water and sewerage charge comparison
- Our UK calculation method and dated electricity references
Source review: 3 October 2026. Ofgem references cover Great Britain; enter your own tariff in Northern Ireland. No extra tax is added to your entered consumer prices. Report a correction.