Our solar hot water solution gets you even more from your solar PV system by using excess energy to heat your water, rather than sending that energy to the grid.
Buying energy to heat your water can get expensive, but solar power is free once you’ve paid for its installation. So, it makes sense to make the most of your solar power, for your purse and for the planet. We can help you do this by installing a clever add-on called an immersion diversion device.
How does the immersion diversion work?
The system we install, the Eddi, is intelligent. So, only excess solar power is used to heat your water tank. The Eddi works by continuously measuring your solar generation and your household consumption and then diverting any excess energy to your hot water immersion heater.
The system will adjust the flow of energy to your immersion heater in response to changes in your solar generation and your consumption, as you go about your daily life.
For example, on a sunny day the device may divert a full 3kW to your immersion heater. If the day becomes cloudy the device will adjust the energy being diverted as the output of your solar PV system drops.
This is a particularly efficient use of energy because immersion heating uses what’s called a resistive element. This basically means that however much energy is available at any time that energy can still be diverted and used, as an immersion heater does not require a certain amount of energy to be “on”. You can compare this to a kettle which requires a set amount of energy to switch on and anything less than that is ineffective.
How much hot water can you generate?
A well-designed and sized solar PV system paired with an immersion diversion device can provide up to 70% of your annual hot water requirements. So, you could make huge savings.
In the summer you can expect to heat a full tank of water if your daytime usage is low. In winter, excess energy generation will still preheat your water.
So, you’ll be saving throughout the year.
You’ll also be reducing the “on” time for your boiler. We’d recommend keeping it off during the day, especially if you’re not at home, then switching it on in the evening. This means your boiler only tops up already warmed water, maximising energy savings.
What about solar hot water panels?
Solar hot water (or solar thermal panels) were a popular way to use the sun’s energy to heat water. Many households still have solar thermal systems.
Nowadays, we recommend a solar PV system paired with an immersion diversion device, due to:
Cost: the cost of solar PV panels, which generate electricity, has come down hugely in recent years. But, the cost of solar thermal has remained stable. So, solar PV panels generally make more economic sense.
Maintenance: solar PV panel systems tend to have much lower maintenance costs than solar thermal panel systems.
Flexibility: Solar thermal is a plumbing rather than electrical solution and so is only able to heat water. On the other hand, solar PV offers greater flexibility in meeting household energy demand.
The work SunGift carried out on our property was extremely slick and professional, with every aspect of the system being carried out to the highest standards. We can’t fault SunGift in any way and we recommend them to everyone we know who expresses an interest in renewable energy.
Which device should you choose and how much will it cost?
We recommend the Eddi device. There have been a few devices available over the years and we’ve found the Eddi to be the most reliable and efficient. Also, the Eddi also has more customisable features and is fully compatible with battery storage, unlike its competitors.
Installed prices for an Eddi start from £680. If the system is installed at the same time as solar panels or battery system, the installation cost of the Eddi is reduced.
To have the Eddi installed:
- you’ll need to have an immersion heater installed as part of your heating system; and
- you mustn’t have solar thermal hot water panels already
You can have an Eddi installed along with a solar PV system or you can add one onto your system later.
To talk to one of our team about an Eddi, just get in touch.