Why is my storage heater cold in the morning?

The most likely cause is that the input dial is turned down or off, or the off-peak electricity supply is not reaching the heater. Check both the input setting and the MCB for the off-peak circuit.

What do the input and output dials do?

The input dial controls how much heat is stored overnight — turn it up in cold weather. The output dial controls how quickly stored heat is released during the day.

How do I know if my Economy 7 is working?

Check your electricity meter during off-peak hours (usually midnight to 7am). If it has two readings, the lower-rate reading should be advancing during off-peak hours.

Is it worth replacing old storage heaters?

Modern storage heaters with electronic controls are significantly more efficient than older models. If your heaters are over 15 years old, replacement often pays for itself through lower energy bills.

Low risk

Updated 30 August 2026

Storage Heater Not Working

Your storage heater is not producing any heat or is barely warm during the day.

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What's happening?

Storage heaters work by charging up with heat overnight using cheaper off-peak electricity (Economy 7 or Economy 10) and releasing that stored heat during the day. When a storage heater is not working, it may not be charging overnight, may have a faulty element, or the output controls may not be functioning correctly.

What usually causes it?

Input dial turned down or off — heater not charging overnight
Off-peak supply not reaching the heater (meter or timer fault)
Failed heating element inside the storage heater
Faulty thermostat or charge controller
Tripped MCB on the off-peak circuit
Economy 7 meter not switching to off-peak tariff

Is it dangerous?

Storage heaters that are not working are not dangerous. However, they contain heavy clay bricks that retain heat, so if a heater is getting excessively hot to touch or giving off a burning smell, switch it off at the isolator and call an electrician.

Can I fix it myself?

Check that the input dial is turned up (this controls how much heat is stored overnight). Make sure the output dial is open during the day. Check the consumer unit for a tripped MCB on the off-peak circuit. Verify your Economy 7 meter is switching — off-peak times are typically midnight to 7am.

When should you call an electrician?

Call an electrician if the heater is not charging despite correct settings, if the off-peak circuit MCB keeps tripping, if only some of your storage heaters are affected, or if the heater is making unusual noises.