Electrolytic Scale Inhibitor

Electrolytic scale inhibitor for use in heat pump installations, supplied by Go GeothermalElectrolytic scale inhibitor for protecting hot water systems

65% of the UK population is provided with hard water, which contains high levels of calcium and magnesium salts. This limescale builds up inside household appliances, causing them to run less effectively and increasing the likelihood of premature breakdown. By protecting against the build-up of limescale, it could also save up to £130 a year on typical energy bills, as scale also impairs the efficiency of heat transfer.

Stocked by Go Geothermal the SESI is an electrolytic scale inhibitor, a cost-effective solution to help tackle limescale build up. It provides a long term solution which requires no maintenance and protects the whole house without introducing any undesirable chemicals to the drinking water.

Key features

  • Protects against limescale encrustation
  • WRAS approved
  • 5 year guarantee
  • Available in 22mm from Stock
  • Recommended by the Compliance Guide to Part L1 of the Building Regulations
  • Takes just a few minutes to install


The unit should be installed in the rising main of the municipal water supply, but after the water meter and primary filter units (if fitted), so that the whole property is protected. If the device is fitted to protect only a single appliance (i.e. the DHW), there should be at least 3 metres of water pipe between the SESI unit and the appliance.

The unit must be installed in accordance with WRAS installation requirements.

As used by one of our directors

“We couldn’t install the SESI onto the main water feed into my house, so we had one put on the flow into the DHW. The reduction in scale deposits in the shower was absolutely incredible. Why wouldn’t you install one?” – Sean Sowden


Outer Body Copper
Anode Material Bespoke Zinc Alloy
Test Regulations (UK) WRAS Certification 0706038
Connection 22mm* Compression
Design Flow 0-37l/min (2.22m 3/hr)
Length 190mm
Width 35mm (max)
Weight 0.40kg

*Removal of compression fittings converts unit to 1/2” BSP