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The Sanura Flatmate is the most cost-effective shower heat exchanger for saving energy in existing showers

April 2020
May 2023
Gallery Flatmate 1
Gallery Flatmate 1


A lot of energy is wasted in showers. Valuable hot water is used for only seconds and is then drained into the sewer. By using a shower heat exchanger, heat can be recovered from the drain water and reused to pre-heat the incoming cold water. This results in significant energy savings and reduced carbon emissions. Current shower heat exchangers are integrated into the shower floor or wall, requiring breaking and plumbing work. Especially in existing showers/bathrooms, breaking and plumbing lead to significant implementation costs and hinder large-scale adoption of heat exchanger systems. Sanura developed the Flatmate, a shower heat exchanger that can be easily installed on top of the existing shower floor and connected to a standard shower faucet, without any breaking or plumbing work. By eliminating implementation costs, the Flatmate is the most cost-effective heat exchanger solution for existing showers/bathrooms.

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Label Date May 30, 2023
By Sanura
From Netherlands
Maturity stage Medium and large scale commercialization
Looking For Network, New clients, Visibility, Partners, Credibility

The environmental benefits

  • The Flatmate saves around 30% energy in the shower
  • The Flatmate can be installed within 20 minutes, without any breaking or plumbing works
  • By reusing heat that is otherwise wasted, the Flatmate significantly reduces the total energy used in a shower
  • In a typical use case of a 4-persons household, the Flatmate prevents around 5 tons of CO2 from being emitted over its 15 years product lifetime.

The Financial benefits

  • In a typical use case of a 4-persons household, the Flatmate leads to energy savings of up to 200 Euro per year
  • With a consumer purchase price of 689 Euro, the simple payback time is less than 4 years for a typical 4-persons household

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Company Profile


We develop and sell shower heat exchangers that are cost-effective and easy to implement.

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The information set out above, is solely for the purposes of information and the Solar Impulse Foundation does not provide any guarantee as to its authenticity, completeness or accuracy. This information does not constitute investment advice or a recommendation to buy into, transact or to enter into any agreement with any of the parties or persons mentioned above. Potential investors or interested parties are solely responsible for their investment or business decisions and for performing any due diligence required by the circumstances. The innovator Sanura has asserted ownership of the intellectual property rights for images, videos, and content showcased above, affirming full and unrestricted usage rights, and has provided explicit permission for the Solar Impulse Foundation to publish such information designated as "public" in the application form.