Answer first

Compare kWh, not pounds, and align the dates with outdoor temperature and household use. Then check room targets, heating curve, schedules, hot-water and immersion history, fault codes, pressure and recent changes.

If the rise remains unexplained, give an engineer meter data, controller screenshots and dates. That is more diagnostic than “the bill is high” and helps separate demand, control and equipment faults.

kWh first

Separate energy consumption from tariff price

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Weather-led

Heat demand rises as outdoor temperature falls

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1°C matters

Changed room targets can materially increase heat demand

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Let FLO investigate the evidence behind higher use

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Separate price from consumption

Compare the electricity meter or supplier kWh for equal date ranges. A higher unit rate or longer billing period can raise pounds while consumption stays level.

Where other electric loads share the meter, use heat-pump monitoring, sub-meter data or controller totals cautiously and note their measurement boundaries.

Normal demand can explain the rise

Colder, windier weather; more occupied rooms; higher thermostats; longer showers; a new baby; working from home or an extension all increase useful heat.

Compare heating degree conditions if possible, or at least local average temperature. One mild month and one freezing month are not a fair efficiency comparison.

Check controls and direct electric heat

A changed heating curve, permanent boost, failed sensor, short schedules followed by high recovery, or an immersion left enabled can increase electricity. Controller histories and smart-meter patterns can reveal timing.

Do not disable safety or hygiene functions blindly. Record the finding and ask how the intended control should operate.

Look for flow and equipment problems

Dirty strainers, low pressure, air, closed valves, blocked airflow, repeated defrost or component faults can reduce effective performance. A cold room may also prompt users to raise the whole curve when one circuit needs balancing.

A diagnostic visit should test a hypothesis using temperatures, flow, fault records and control demand—not simply reset the unit and leave.

What to read next

Related answers and services

Expected electricity useEstimate demand divided by seasonal efficiency.Controls and weather compensationUnderstand curves, schedules and small changes.Performance and controls supportSend FLO the data and symptoms.All 60 heat-pump answersFind the next question in the FLO knowledge library.

Questions people also ask

Why is the winter bill higher than summer?+

Space-heating demand is much larger in cold weather; compare with similar weather and occupancy.

Could the immersion heater be responsible?+

Yes, if it is running more than intended. Check controller or meter history without disabling required safety functions.

Should I turn the heat pump off to save money?+

Repeated off-and-boost operation can be counterproductive; review the weather-compensated schedule and household need first.

Evidence used for this answer

Figures are explained in context and links go to the independent source. Prices, tariffs, scheme rules and standards can change, so check the source again before making a financial or technical decision.