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.

Our Thermino batteries are a residential thermal energy storage solution that replaces traditional hot water cylinders – direct (for grid electricity and solar PV) or indirect (for boilers and heat pumps).

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. This means that heat pump systems can be installed where otherwise they wouldn’t fit, for example.

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

Our fourth-generation heat batteries for hot water maximise the use of renewable energy and can be charged by air-source heat pumps, ground-source heat pumps, photovoltaics (PV), grid electricity and boilers.

Ideal for retrofitting to existing hot water systems as well as 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 hpPV
For heat pumps linked to solar PV

See product
Thermino i
For boilers, with standby electric heating

See product
For boilers

See product
Thermino iPV
For solar PV and a boiler, with grid electricity as back up

See product
Thermino hp
For heat pumps from Daikin, Samsung and Vaillant

See product

Direct cylinder replacements

Thermino e
For grid electricity

See product
Thermino ePV
For solar PV, with grid electricity as back up

See product