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What is a heat battery?

These are both ways of storing energy as heat. While thermal stores are more like your trusty old hot water tank, heat batteries are their cool younger sibling: they’re sleek, small, and hold on to heat for longer. Sunamp UniQ heat batteries are perhaps the most compact example out there.

Do heat batteries reduce energy costs?

The main feature of heat batteries is moving most of your heating demand to low cost off-peak tariffs, so whilst it does not reduce how much energy you need to buy as much as a heat pump, it does reduce how much you pay for electricity.

How does a heat battery work?

Heat batteries store energy that is released slowly to heat the home or produce hot water. Electric storage heaters were in fact an early form of heat battery, whereby thermal bricks heated up overnight on lower-cost electricity tariffs and discharged through the day. However they often did a poor job of effectively heating the home.

How have heat batteries changed over time?

Modern heat batteries have evolved significantly. They can store more energy and use smart technology to optimise when to charge and discharge. Their development coincides with more ‘time of use’ tariffs, whereby households are incentivised to shift more of their energy use to much lower off-peak tariffs.

Can a heat battery be used in a home?

There are currently two types of heat battery for domestic use: Sunamp’s hot water unit and Tepeo’s ZEB boiler (stands for Zero Emissions Boiler). Sunamp uses a heat exchanger submerged into a 'phase change' liquid that releases energy as it freezes. NB Sunamp can only supply hot water, not heating.

Are heat batteries a good idea?

Sunamp have tested them over more than 10,000 cycles with no degredation. Because they have minimal heat loss you can charge them at any time during the day, to take advantage of excess solar, cheap rate electricity, low carbon electricity etc. What's not so good about a heat battery? It isn't flexible when compared to storing electricity.

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