Guide

Electric heating costs explained

Electric heating pages often confuse people because direct electric heaters all pay the same electricity price per kWh. The real differences usually come from heater size, room fit, control quality and how long the unit stays near full output.

Last reviewed: 16 April 2026 - UK-focused background guide

Start With The Question You Really Have

This guide works best when it sends you into the right practical next step rather than leaving you in reading mode.

Need a numberI want the likely cost nowUse the heater running-cost calculator when wattage, hours and tariff are already clear enough.Check the fitI think the room is the real problemUse the sizing calculator when the heater may be wrong for the room before worrying about style or brand.Choose between typesI am comparing heater optionsMove into the comparison tool when two electric heater routes still look plausible and you want a verdict.

Quick answer

For most direct electric heaters, the big cost question is not "which magic heater is cheapest?" but "how much heat does the room need, and how long will this heater actually run near full output?". That is why room size, insulation and use pattern often matter more than brand claims.

All direct electric heat starts from the same fuel price

A fan heater, oil-filled radiator and panel heater all buy electricity at the same tariff. The differences show up in control pattern, comfort and room suitability.

Room mismatch is expensive

A heater that is too small can stay near full power for too long. A badly chosen heater can therefore cost more in practice than the headline wattage comparison suggests.

Use case decides the best heater

Fast occasional warmth, steady evening heating and spot comfort all suit different heater types even when the unit rate per kWh is identical.

What usually changes the answer

These are the practical details that usually change the answer more than a manufacturer headline or a one-line forum estimate.

  • Tariff matters, but so do hours used and how often the heater cycles down.
  • Room heat loss matters because colder, leakier rooms force longer higher-output operation.
  • User behaviour matters because timers, thermostats and door-closing habits can change the bill far more than product marketing suggests.
  • The cheapest heater on paper is not always the best-value option if it leaves the room uncomfortable and runs longer.

Related pages

Use these next if your question has moved from a simple cost or saving estimate into a bigger household decision.

Methodology

Read the assumptions behind duty-cycle and room-fit estimates.

Are all electric heaters the same cost to run?

Per kWh, direct electric resistance heaters all use electricity at the same unit price. The difference is how long they need to work near full output and whether they suit the room.

Why do some heaters feel cheaper in practice?

Because better room fit or better controls can reduce how long they run hard. The electricity itself is not cheaper.

What should I check before buying an electric heater?

Check room size, use pattern, controls and whether you want fast warm-up, steady comfort or spot heat rather than looking for a supposedly cheap-to-run magic type.