A Journey of Ideas, Innovation and Change

Our Vision for the Future

Energy storage is at the very heart of making renewables and energy efficiency work. Over 80% of energy used in homes is for heating and hot water, and twice as much heat and cooling energy is consumed in the world economy as electricity.  

Sunamp set out to explore the potential of using thermal energy storage to make buildings more energy efficient, sustainable and self-sufficient, whilst reducing carbon emissions by optimising renewable energy sources on-site, supporting the grid to allow on more renewable electricity sources and harvesting waste heat for re-use.

 Sunamp’s patented Heat Battery energy storage technology protects the environment and improves our quality of life through reducing reliance on fossil-powered heat while driving down fuel costs. We also managed to enhance safety and resilience, with fire-proof, low maintenance solutions that provide 24/7 access to heat and hot water even through a power cut.


Our unique technology is being extended across sectors: up the size scale to containerised multi-megawatt industrial heat/cool applications; and into the transportation sector via Sunamp Automotive. There we are seeing exciting developments from improving air quality in cities by using heat batteries to improve engine efficiency and reduce emissions on buses, to ensuring that electric cars can achieve the same range, whatever the weather, by delivering all required heating and cooling from thermal storage.

Sunamp technology is transforming how we generate, store and use heat and cool around the world and is impacting how we tackle climate change and safeguard our planet for future generations.


Andrew Bissell, CEO

Heat Storage Products

Sunamp’s UniQ Heat Batteries use phase change materials (PCMs) to efficiently store heat for domestic hot water systems or space heating. They can be charged by electricity, air source heat pumps, ground source heat pumps, boilers and photovoltaics.

Sunamp UniQ batteries are available in 3kWh, 6kWh, 9kWh and 12kWh models and can be retrofitted to existing hot water systems or specified for use in new build projects. Modular and scalable, batteries can be connected in series or in parallel to increase heat storage capacity.

Direct Cylinder Replacements:

UniQ eHW charged by grid electricity (off-peak optional)

UniQ eHW+iPV charged by PV electricity and off-peak grid electricity

Indirect Cylinder Replacements:

UniQ HW charged by boiler or high temperature heat pump

UniQ HW+i charged by boiler or high temperature heat pump with grid backup 

UniQ HW+iPV charged by PV electricity and a boiler or high temperature heat pump

UniQ HW+iLTHP-SG charged by a Samsung low temperature R32 heat pump (LTHP) with grid backup

UniQ HW+iLTHP-DN charged by a Daikin low temperature R32 heat pump (LTHP) with grid backup


Based on the understanding that the world uses over twice as much heat as electricity, Sunamp Heat Batteries help solve numerous problems by storing energy as heat and releasing it when and where it is needed. This is achieved at lower cost and higher efficiency than competing technologies (e.g. electrical batteries, hydrogen electrolysis or fuel cells) and is a totally new way of storing energy, developed in collaboration with the University of Edinburgh School of Chemistry and then perfected at Sunamp laboratories.

Others have tried, but no-one before has succeeded in perfecting our combination of low-cost materials, exceptional long-life, recyclability, safety and high energy density. This guarantees high energy output and almost unlimited lifespan; as the composition of the material remains unchanged.

Sunamp thermal batteries contain inorganic, non-toxic, salt-based Phase Change Materials (PCM), which absorb and release thermal energy during the process of melting and freezing. When a PCM freezes, it releases a huge amount of energy in the form of latent heat at a constant temperature.

Our innovation has resulted in a uniquely successful formula which is transforming how we use energy and provide heat around the World.


Our technology is designed around ensuring a positive impact on the environment with the long-term ambition of significantly impacting the global campaign to stop climate change.

By eliminating the need for fossil-fuels and supporting renewable energy, Sunamp Heat Batteries reduce CO2 emissions, NOx emissions and empower people to become more energy efficient around the world, from the individual to large scale organisations and housing developments. Unlike chemical batteries, it does not use any hazardous or toxic materials, and does not create any end-of-life disposal issues.

Fuel Poverty

At the heart of the Sunamp vision is providing local solutions to address fuel poverty. Our innovative technology has enabled more efficient utilisation of different renewable technologies to positively impact on tenants seeking to reduce their energy costs. From Sheltered Housing Complexes to individual homes and Social Housing, having 24/7 access to stored heat and hot water reduces bills by up to 75% and keeps tenants warm even through a power cut.

This integrated approach also saves Local Authorities money, with savings made from reduced rent arrears and minimised cost of maintenance and repairs.