Use your free electricity when you are out
Our energy saving device for solar directs excess electricity to the immersion heater.

Increase your return on investment
When using the immersun to heat water with PV we estimate you could achieve a payback of 3-5 years.

A solar controller that is simple to install
The immersun uses your existing immersion heater when using your solar panels to heat water.



Use your free energy and still get paid
Use up to 100% of your generated electricity and still get 50% export FiT.

Higher efficiency reduces your energy bills
By using more of your free electricity you will make substantial savings.

Built in hot water timer with added Boost function
You have total control over your hot water with our advanced features.



The immerSUN monitors the electricity which is about to be exported to the grid and diverts it to the immersion heater. It then automatically directs any excess generated electricity, not used by the house, to the immersion heater in the hot water cylinder.

If the load from the house increases, eg. the washing machine is turned on, the immerSUN will reduce the amount sent to heat water to help you maintain independence from the grid.

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Contact US: 01457 853 517 


Call us today on: 07759 725 318


Immersun Brochure


User guide

User Guide