Deciding whether to heat one room with a portable heater or use central heating for the whole house involves more than just comparing gas and electricity unit rates. From October to December 2026, Ofgem's average Direct Debit electricity rate is 26.32p per kWh, while the average gas unit rate is 7.97p per kWh.
A portable heater may save money for short-term warmth in a single room. However, if multiple rooms require heating, central heating with its controls could be a more effective choice. Factors to consider include the number of rooms needing warmth, the duration of heating, and the capabilities of your existing heating system, such as thermostatic radiator valves.
To accurately compare costs, it is recommended to record meter readings before and after similar periods of use. This can help reveal the actual electricity consumption of a portable heater. The Energy Saving Trust advises using heating controls to heat your home only when and where it is needed.
Maintaining adequate warmth is also important for health. UK health guidance suggests aiming for at least 18°C in frequently used rooms, especially for older people, those with reduced mobility, and individuals with certain health conditions. Leaving rooms very cold for extended periods can also lead to condensation and mould.