Economy 7 heaters

How do I get my Economy 7 Heaters checked to make sure they are working properly. They are so annoying, we need to be warm in the evenings but by then there is no more heat from them.

Call an electrician.

Sorry if t not appropriate for you but my solution of escape from storage heater hell was to get rid of them. After 7 years I had suffered enough & went the air source heat pump route with radiators. Govnt payback on them very generous, keeps house toasty and roughly 1/3 of the running costs of regular electric heaters.