Thermino thermal storage for domestic hot water

Thousands of Sunamp thermal batteries are already in homes across the UK storing heat from low-carbon energy sources and releasing it for mains-pressure hot water when needed. The Thermino range is now available in the USA.

Our Thermino batteries replace traditional hot water cylinders – direct (for grid electricity) or indirect (for boilers).

They are up to four times smaller than the equivalent hot water tank because they are filled with our energy-dense phase change material, Plentigrade.

Why use a Thermino thermal battery for hot water?

On demand

Save space

Use renewables

Cut CO2

Easy fit


No mandatory maintenance

10-year warranty

The Thermino range

The Thermino range – our fourth-generation heat store for hot water – maximizes the use of renewable energy and can be charged by grid electricity and boilers.

The batteries are designed for retrofitting to existing hot water systems or specifying for use in new build projects. Their sleek, super-compact design means they look good in any home and free-up valuable storage space.

Indirect cylinder replacements

Thermino i
For boilers, with standby electric heating

See product
For boilers

See product

Direct cylinder replacements

Thermino e
For grid electricity

See product