Gallery Flatmate 1
Gallery Flatmate 1
April 2020
Headquarters 3604 DC Maarssen, Netherlands

Flatmate - An efficient shower heat exchanger for existing showers/bathrooms

While showering, valuable hot water is used for only seconds and is then drained into the sewer resulting in a substantial waste of energy. The Sanura Flatmate can recover this wasted heat and reuse it to pre-heat the incoming cold water.

Flatmate can be easily installed on top of the existing shower floor and connected to a standard shower faucet, without any breaking or plumbing works which eliminates significant implementation costs. The device is composed of a flat tray heat exchanger, a connection tube, and a connection device that is mounted in between the shower faucet and the shower wall. Flatmate was integrally designed for disassembly (DFD), which means that all components can be taken apart, repaired or recycled.

Key features

  • Efficiency around 40%
  • In a 4 person households 4,3 tons of CO2 emissions can be prevented over its 15 years lifetime


  • Average pay back time of only 3-6 years
  • In a 4 person households, energy savings can reach 150 Euro per year

Categories of Application

Company Profile

Maturity Stage

  • Medium and large scale commercialization
  • Small scale commercialization
  • Initial market commercialization
  • Prototype testing in the real world
  • Prototype testing 1:1 in the lab

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