Tax Tool

Energy

Water Heater Electricity Cost Tool

Estimate the electricity use and running cost of a water heater. Enter your usage and energy price for a planning estimate.

Quick math0

Use this for quick arithmetic, percentages, or to check figures while filling in the main tool, without leaving the page.

Your figures

Estimate

Estimated annual cost: 4,380 NOK

Annual cost
4,380 NOK
Monthly cost
365 NOK
Annual use
2,920 kWh

Assumes the same usage and electricity price throughout the year.

How to use this tool

  1. Use Water Heater Electricity Cost Tool for the question described above, and check that the inputs match your records and time period.
  2. Enter heater power (Rated power.).
  3. Enter heating hours per day (Estimated active heating time.).
  4. Enter electricity price (Energy price including the parts you want to include.).
  5. Change heater power, heating hours per day, electricity price to compare scenarios, then check the units in the result.

Worked example with the prefilled values

This example shows how Water Heater Electricity Cost Tool uses its starting values. Change the calculator inputs to estimate your own situation.

Heater power
2 kW
Heating hours per day
4 h/day
Electricity price
1.5 NOK/kWh

Estimated annual cost: 4,380 NOK

  • Annual cost4,380 NOK
  • Monthly cost365 NOK
  • Annual use2,920 kWh

Assumes the same usage and electricity price throughout the year.

Formula and calculation logic

Annual electricity (kWh) = rated power (kW) × active heating hours per day × 365

Annual cost = annual electricity × price per kWh

Annual energy is rated kilowatts × active heating hours per day × 365. Estimated annual cost multiplies that energy by your entered price per kilowatt-hour.

Assumptions

  • The default active hours are only an example. Thermostat cycling, incoming water temperature, tank losses, household demand, and seasonal prices change actual use.

Published sources

Further reading for checking current rules and information. These links are not live inputs to the tool.

Questions about this tool

Why can my water heater use more or less electricity than this estimate?

The estimate assumes a fixed number of active heating hours. Household hot-water use, incoming water temperature, tank losses, and thermostat cycling change the actual consumption.