Sunamp Heat Battery

Works with any tariff including off-peak electricity or other renewable sources such as solar PV.

Sunamp heat battery for hot water

Sunamp heat batteries are energy-saving thermal stores that efficiently store heat for hot water on demand.


Up to 4x more compact than traditional hot water cylinders and with far lower heat loss, they are quick to install and compatible with a wide choice of energy sources including heat pumps, solar PV and boilers.

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Patented Phase Change Materials

With four volume options ranging from 70L through to 300L Sunamp is able to provide all of your hot water requirements and is the ideal replacement for an inefficient, old-fashioned hot water cylinder.


Sunamp thermal energy storage technology uses patented Phase Change Materials to make homes and buildings more energy efficient and sustainable, while reducing carbon emissions.

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Sunamp in your home

Sunamp heat batteries can be charged with large amounts of energy from renewable and other sources, and released to deliver plentiful hot water at mains pressure and on demand across a wide range of temperatures, and for a wide range of residential and industrial applications.


The wide range of heat batteries for the residential market provide a low carbon, reliable, space-saving alternative to traditional hot water cylinders, safely cutting energy consumption and fuel costs.

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Sunamp thermal store for hot water

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A wide choice of energy sources

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No mandatory maintenance required

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Simple user interface shows heat battery state of charge

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No mandatory maintenance required

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Market-leading 10-year warranty applies to heating element and storage core

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Quick and tidy installation

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Installed by our very own

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Sunamp trained engineers

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Can be installed virtually anywhere

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Flexibility of orientation with exits on three sides of the product

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High-quality mains pressure showers

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No risk of catastrophic water failure as it doesn’t store water

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No risk of Legionella bacteria

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High powered heat exchanger for high quality mains pressure showers

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Stores 4x more energy than water

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Sunamp’s patented Plentigrade phase change material formulation

Instant hot water heater

Our thermal heat store can be charged using any energy source. You can off-set peak energy costs by charging your thermal heat store with cheaper off-peak electricity, or divert energy from your solar PV, heat pumps or other renewable sources. Once charged, the heat can be released instantly when needed, delivering hot water during peak times.


As a unique ERP A+ rated system and available sizes and capacities to perfectly suit your exact hot water requirements and specific property size.

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Frequently Asked Questions

Given that the majority of our home energy usage goes towards producing heat, Sunamp’s instant hot water heater provides you with a more compact, more cost effective, low carbon solution to heating your water.

  • What size is a Sunamp Thermino heat battery?

    There are four different sizes, 70L, 150L, 210L and 300L.

  • Which size do I need?

    This depends on a number of factors such as number of occupants in the property and how many baths, showers and sinks there are. A free survey will identify which is best suited for your needs.

  • Does it work with any energy source?

    It sure does – grid electricity, solar photo voltaics (Solar PV), heat pumps and boilers.

  • Is a Sunamp Thermino truly compact?

    Absolutely – A Sunamp Thermino heat battery is up to 4 times smaller than the equivalent water tank, freeing up valuable storage space.

  • Does it require any servicing?

    No, there is no mandatory annual servicing.

  • Who buys a Sunamp Thermino heat battery?

    Homeowners, Landlords and property developers to name but a few. In fact, anyone conscious about lowering energy bills, reducing carbon footprint or eliminating gas.

  • Is it safe?

    The secret to the success of Sunamp heat batteries is their world leading Plentigrade technology. The Thermino range uses high-performance Plentigrade P58 phase change material to deliver hot water on demand. It absorbs and releases thermal energy during a melting and freezing process in a similar way to the gel in a pocket handwarmer. Freezing releases a huge amount of energy in the form of heat at a constant temperature.

  • What warranty does it have?

    A market leading 10-year manufacturer warranty applies to the heating element and storage core.

  • Will it work with my shower

    A Thermino is compatible with most showers and its high powered heat exchanger allows for high quality, mains pressure showers. An altogether enhanced showering experience. No more poor water pressure at shower time.

  • How efficient is a Sunamp thermino?

    It is 4 x more efficient at storing heat than hot water.

  • So it stores water like my cylinder?

    No, it stores heat energy only, so no risk of catastrophic water failure!

  • Will it work with economy 7?

    Yes, it will work with any electricity tariff. With the introduction of ‘agile’ tariffs there is also the opportunity to take advantage from cheaper ‘charging’ and therefore even lower running costs.

  • Does it heat the water instantly?

    Yes, a Thermino instantly heats the water for freshness and hygiene.

  • Can you recycle a Sunamp?

    Yes, all components within a Thermino are able to be recycled at end of life.

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Fill out the form for a free quote and find out what fulfils your needs best, how much it would cost and how long it would take. Or call us on:

03300 554 888

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