IMMERSUN has saved all of its homeowners a total of £74.2 Million and reduced global CO2 Emissions by 140,000 Tonnes.
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General FAQs

Who are we?

The IMMERSUN is our ‘state of the art’ energy-saving device. It helps you to self-consume the green energy produced by your microgeneration system and is compatible with all renewable generation technologies, including solar PV, wind turbine, and hydro systems.

The device is essentially an automatic power controller that diverts surplus power to a designated load, normally a hot water heater, to save energy and minimize your utility bills.

What does the IMMERSUN do?

The IMMERSUN monitor’s power is imported from and exported to the grid. Power generated by your PV or another micro-gen system that is normally exported is surplus power.

The IMMERSUN diverts this surplus power, to the water heater or other load, thus preventing it from being exported.

How does diverting this energy benefit me?

Surplus energy that is exported back to the grid can be as high as 80% of the total that is generated in the first place. The IMMERSUN can help you use up to 100% of your micro-generated energy, which is completely free!

How does the IMMERSUN save me money?

The IMMERSUN allows you to store energy as hot water even when you are out. Later on in the day, you are able to use this free hot water in the home. Without the IMMERSUN you will be paying up to 15.0p per unit to heat your water.

How much can the IMMERSUN save me?

By allowing users to self-consume up to 100% of green energy, the IMMERSUN can save you up to £250 annually – more if you use electricity to heat your water and home! The higher the price you pay for your energy, be it electricity, gas, or oil, the greater the savings will be from your IMMERSUN.

Are there any benefits other than financial, to having an IMMERSUN fitted?

Maximizing your usage of renewable energy will help to reduce your reliance on grid power. The usage of green electricity will help reduce your carbon footprint and therefore make your property more environmentally friendly.

Who will benefit the most from having an IMMERSUN installed?

To reap the biggest financial rewards you ideally need to have a hot water storage tank with an electric immersion fitted. By directing surplus energy to the immersion element, you can utilize up to 100% of all self-generated green energy – even when you’re not at home!

Can I view my savings on the IMMERSUN?

The IMMERSUN is fitted with a clear graphical LCD display, allowing the following information to be viewed.

Grid import/export in kW
Diverted energy in kW
Savings made both in monetary value and kWh

What will be my likely Return on Investment?

Your ROI will be between 2-5 years depending on individual circumstances. This will of course be dependent on what fuel you normally use to heat your water.

Technical Info
What technology does the IMMERSUN use to control the diverted power?

TruSINE™ PWM is the power control technology implemented by the IMMERSUN. This was developed by us as our proprietary control method. Pulse Width Modulation (PWM) ensures that the power going to the load is a non-distorted true sine wave, with only the voltage altered. This means the voltage is very smoothly adjusted to alter the power to the heater.

This control technology is unique to the IMMERSUN device and means that it is much more sophisticated than any similar product on the market.

Why have we invested in truSINE technology?

TruSINE technology ensures that the power from the IMMERSUN is the same quality as that of the electricity that enters your property from the grid. This technology is the reason the IMMERSUN meets all CE product approval guidelines.

Careful consideration was given to this decision as choosing a cheaper control method, such as phase angle, to save money on the initial cost of the unit, would have been a false economy as problems could arise after installation.

What if I have a combi boiler and no hot water tank?

You can still use an IMMERSUN if you have an electric micro gen system and the following:

Electric storage heaters (the IMMERSUN is compatible with Economy 7 & 10)
Underfloor heating
Space-saving electric heaters
Any other electrical resistive load up to 3kw with a mechanical thermostat
What is the maximum amount of power the IMMERSUN can utilize?

The size of the PV system is not important.

Each IMMERSUN can utilize a maximum heater load of 3.2kW and cannot be connected to a greater heater load greater than this (ie immersion).

Does the IMMERSUN offer built-in protection?

The IMMERSUN is the only such device that has internal electronic circuitry protection, this ensures the following:

Fully short circuit protected in case of load fault
Overload/thermal damage protection
Soft starting to avoid power surges and extend heater life
Surge protection
Installation Info

How long does the IMMERSUN take to install?

The IMMERSUN needs to be installed by a suitably qualified person, normally an electrician. If you do the work yourself you may wish to arrange for a qualified electrician to check it for you.

The IMMERSUN can be installed in as little as an hour. The actual time taken will depend on individual circumstances.

Can the IMMERSUN be installed with a 3-phase system?

Yes – An IMMERSUN can be used on each phase but must be on the same phase as the CT sensor.

If you have a single-phase inverter installed on one of the phases, then a single IMMERSUN unit connected to that phase can utilize up to 3.2kW of surplus power
If you have a 3-phase inverter, the total generation will be split into thirds, one 1/3rd on each phase. So with a single IMMERSUN on each phase, up to 3.2kW of surplus power can be utilized per phase”
Up to 5 IMMERSUN devices can be installed on each phase.