Use Your Surplus Electricity To Heat Your Water - For FREE

This is a fantastic little electronic box that could provide you will FREE HOT WATER during the warmer months of the year.


With the use of immerSUN you can ‘heat your water for free’ using your own green energy.


Surplus energy from your PV panels can be diverted to heat your water using your immersion heater, turning your PV system into a solar hot water heating system.


Optionally, the surplus free and green energy can be used to heat your rooms using storage heaters, infra- red panels, electric panel heaters and electric under floor heating.


The immerSUN PV water heating system is a simple and straight forward option to heat water and your house with solar PV panels.  In essence the immerSUN hot water controller is a solar water heater.


Additionally the immerSUN can cascade the free energy to a second heat source; e.g the immerSUN can divert your free PV energy to storage heaters, electric under floor heating or electric panel heaters once the first source is satisfied.

The Immersun Brochure

If you click on the links below you can download a copy of the latest Immersun Brochure or for those of you with a more technical nature the Installation Manual and Users Guide and a selection of Technical Graphs.


We have installed dozens of these fantastic units since they were introduced at ECO BUILD in the Summer of 2012.



This unit cannot work with combi boilers.  You need a hot water tank with a electric immerson unit to divert your surplus energy to.

The Immersun Brochure
immerSUN Leaflet 3.pdf
Adobe Acrobat document [652.6 KB]
User and Installation Guide
Adobe Acrobat document [411.3 KB]