Electric heaters: buying guide
Compare portable heater controls and room use, with a clear seasonal cost calculation.
Reviewed · Next editorial review by 5 February 2027 · Independent buying framework; no hands-on testing or product ratings.
Define the room, occupied hours and existing heating before buying a portable electric heater. It may provide heat where you need it, but the purchase does not establish that your total household bill will fall. Compare controls, placement requirements and the heat output required for your particular use. A different casing or advertising name is not enough evidence for an electricity-saving claim.
Which type suits your home?
Fan heater
Consider airflow, fan noise and the controls you will use while the room is occupied. Check the permitted placement and operating conditions in the exact manual before deciding where it can stand.
Convector heater
Compare thermostat controls, timer behaviour and the available floor or wall arrangements. If wall mounting is offered, check the exact fitting instructions and what installation work is included in the quoted price.
Oil-filled radiator
Assess footprint, weight and the practical controls. Heat retained after switching off is part of the earlier electricity input; it is not free energy or proof that the appliance provides more heat per purchased unit.
What to check before buying
Power and control range
Compare heat settings and thermostat operation. Rated input describes a powered setting, while room conditions and cycling determine how long that input is drawn during your session.
Room and timing
Write down the occupied hours and active weeks rather than assuming year-round use. A timer is helpful only when it matches your routine and the operating instructions allow the intended use.
Placement and operation
Read the model's requirements for clearances, sockets and permitted locations. Do not apply a generic distance or operating rule to every design, and do not use a heater for tasks its manual prohibits.
Usability and support
Check display readability, button access, movement when cool and warranty arrangements. A connected feature can add app or account requirements without changing the amount of heat your room needs.
What ownership really involves
Use a seasonal schedule and distinguish full-power hours from elapsed time under thermostat control. The example assumes 20 weeks of use and excludes standing charges. It estimates the appliance's electricity only, not the cost of a whole-home heating strategy or any reduction in another fuel bill.
A common comparison mistake
Do not assume a portable resistance heater guarantees cheaper heating because it is described as economical. Compare equivalent comfort, occupied rooms and measured total energy before making a household saving claim.
Compare running costs
A hypothetical 2,000 W heater at full input for two hours daily over 20 weeks. These are hypothetical starting figures, not a measured product average. Scenario B starts equal to A: change it to your alternative's documented figure.
Annual difference: £0.00. Equal under these assumptions.
Seasonal full-power scenario. Thermostat cycling and room heat demand vary; this does not predict whole-home savings. Electricity only; excludes standing charges and purchase costs. Monthly figures spread annual cost over 12 calendar months. Seasonal estimate uses active weeks × uses per active week; 52 weeks is 364 days. A and B share the same usage assumptions.
Your questions answered
Does a 1 kW heater always cost half as much as a 2 kW heater?
For equal full-power running time at the same tariff, the electricity cost is half. That does not establish equal comfort or the same running duration in a real room.
What should I enter for thermostat cycling?
Use measured kWh for a representative session if available. Otherwise treat rated watts multiplied by powered hours as a scenario, and do not present it as a measured average.
Sources and evidence limits
Source links support the stated buying considerations. Manufacturer material is commercial information, not independent comparative testing. Our editable energy figures are hypothetical and are not taken from these products.
- Dimplex UK: portable heating formats ↗
Manufacturer range information. Heater formats and controls; no guaranteed bill savings or installation advice adopted.
Check the current manual and product sheet for the exact model before purchasing. How we selected these 30 categories · Calculation methodology · Affiliate disclosure