Independent UK guidance
Put cheap energy
on hold.
A heat battery stores energy as heat, ready for hot water or heating later. The useful question isn't whether it works. It's whether it fits your home, tariff and routine.
✓ No sales pitch ✓ No made-up savings
Heat, held in reserve
instead of electricity.
Your tariff, your result
Find the value
in the gap.
Heat storage can shift electricity use from an expensive period to a cheaper one. Enter the two rates from your bill; the calculator shows the maximum price difference before installation cost and heat loss.
The 90-second explanation
Not a giant
electric battery.
It stores warmth directly. That makes it useful for a different job: moving hot-water or heating demand through time.
See how the technology works →Electricity, a heat pump, solar or another heat source warms the storage material.
Insulation slows heat loss while the energy waits inside the unit.
A heat exchanger transfers stored warmth to hot water or your heating circuit.
Sometimes the ordinary hot-water cylinder is still the sensible answer.
The honest bit
Storage changes when you buy energy. It doesn't make heat free.
Low off-peak prices, limited cupboard space or surplus solar can strengthen the case. A small tariff gap, plenty of cylinder space or a very efficient existing system can weaken it.
Compare the trade-offsBuild your answer
Guides for the
questions that matter
View all guides →Heat battery or combi boiler?
Compare a stored-heat system with a gas combi on hot-water flow, space, heating design, tariffs, electrical work and the gas connection.
Read guide →02Compare your optionsHeat battery or heat pump?
A heat pump makes heat efficiently; a heat battery stores heat for later. Learn when they compete, when they work together and what to ask first.
Read guide →03Compare your optionsHeat battery or cylinder?
Compare heat batteries and hot-water cylinders on space, energy source, flow rate, losses, installation and everyday use.
Read guide →04Costs and tariffsHeat batteries on Economy 7
Check cheap hours, meter setup, charge time and day rates before pairing a heat battery with Economy 7.
Read guide →05Costs and tariffsCost and payback
Compare equipment, installation, running costs and avoided costs without turning an optimistic tariff gap into a savings promise.
Read guide →06Technology explainedEfficiency and heat loss
Separate charge efficiency, standing loss and delivered useful heat so product figures can be compared on the same basis.
Read guide →