Understand it · practical guide
Storage heaters explained: the night-charging way to heat
In one line: Bricks charged on cheap night electricity, warmed out all day. How they work, the tariff they require, the modern replacements, and the honest verdict.
Storage heaters are the heating system of the all-electric home: heavy insulated blocks of bricks that quietly drink cheap electricity overnight, then breathe that heat back out through the day. They only make economic sense paired with a night-cheap tariff - the pairing is the entire concept, and the tariff mechanics live in the off-peak guide. Get the tariff wrong and storage heaters are among the most expensive heat in the country; get it right and they are a sensible, silent, maintenance-free system.
The controls, in order of importance
Input (charge): set in the evening for how cold tomorrow will be - high on a forecast freeze, low in mild weather. This is the single habit that decides the bill: charging full every night regardless of weather is the classic storage-heater money leak. Output (boost/damper): how much stored heat releases during the day - closed through the working day, opened for the evening. The modern learning models automate both and hold heat far better; 1990s manual units reward a disciplined human. The thermostat-habit logic applies exactly: consistency is the saving.
The honest trade-offs
Heat runs out by evening if the day turns colder than the forecast - storage, not on-demand. The bricks are heavy and the units chunky on the wall. And daytime top-up boosting on the expensive rate erases the economics - the daytime meter reading is where the complaints come from (the bill autopsy applies). The modern replacements - high heat-retention models and the heat-pump-style units - charge the same way and release far more controllably; when old units die, replacement beats repair, the framework applied to a wall.
The verdict
For an all-electric home with a night tariff and a predictable routine, storage heat remains a rational system - and the routine is learnable in a week. For everyone else, the same night-cheap electricity is better banked by the devices that can use it on demand. Either way, the bricks are only half the system: the tariff is the other half, and the two must be bought together.
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General information, not professional advice. Homes differ — if a job is beyond your confidence or the guide’s boundary, that is what tradespeople are for.