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EV-charging with PV solar panels.

How to heat hot water with PV solar panels in the UK.

PV & tank heating.

Find local MCS installers. Is my roof suitable?

PV solar panels include water heating for a sun-powered tank of hot water - daily

Traditionally, evacuated tubes and solar heating panels were common until the advent of PV-powered heating plugins.

Divert your surplus power to your water tank.

A useful addition for a PV-powered household.

In a nutshell:

Free hot water.

This breakthrough is a solar heating management product that gives an additional benefit from your PV solar panels.

This nifty device means you don't have to pay to import expensive electricity for heating your hot water.

The science bit.

Water heating is typically 25% of a household's costs.


1-4KW with 100W-3500W immersion output.

PV-heating converters work side-by-side with tank-based heating systems all year round.

Questions about PV and water heating

Is it easy to install?

Installation is with minimum fuss. DIY installations are not possible because installers require a Part P electrical qualification legally.

What savings can I expect?

This answer depends on the size of your PV system and the amount of hot water you use, but a four-person family with a 4KW PV panel system can expect to save around 200 GBP per year.

(Figure excludes savings from battery storage at approx 520 GBP per year).

Will I get export payments?

Yes. Currently, export payments, pay for 50% of all your units exported. This system means you can use all your units and still receive the export payments as per usual.

Do I need a hot water tank?

Yes. You need a hot water tank with an immersion heater element to benefit from a converter. The management system will automatically control the heating coil throughout the day.

Not suitable for Combi boilers.

If PV isn't generating, do I still get hot water?

Absolutely. Because the converter works alongside your existing hot water system, your tank will still get heated in the traditionally imported-electricity way.

Can I see how much I have saved?

We wouldn't have it any other way. The converter records and displays how much energy used and converted into financial savings.

Can I still use Economy 7?

Yes, The system has a built-in timer that allows three easy-to-use options. It can be programmed every 24 hours and so take full advantage of your off-peak supply if required.

Can it display the water temperature?

Yes, an optional temperature sensor can be fitted to the PV to hot water converter to display the water temperature.

Does it have a warranty?

All converter installations come with a standard five-year warranty.


I've seen many changes within this industry. The most significant change was the advent of PV solar-heated water.

Free-generated hot water gives additional value to your PV-investment.

From the forum.

"We have had solar panels installed because I have always had an interest in solar panels as an engineer. I've been impressed by my system since its installation six months ago. We've been keeping an eye on output, and they've worked brilliantly, even in some weather conditions you wouldn't expect anything."
Mr. Martin, Kettering.

"Welcome to the solar century."

Stuart Lovatt

MCS PV solar installers network for the UK.

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