With energy prices remaining unpredictable across the UK, homeowners are increasingly looking for smarter ways to maximise the value of their solar PV systems. One often overlooked upgrade is a solar diverter – a simple but highly effective device that helps you use more of the energy you generate.
In this guide, we’ll explain what solar diverters are, how they work and why they’re particularly beneficial for homeowners across the South East and East Anglia.
What Is a Solar Diverter?
A solar diverter (also knows as a solar immersion controller) is a device that redirects surplus electricity generated by your solar panels to power your immersion heater – heating your hot water instead of exporting that energy back to the grid.
Rather than receiving a low export rate for unused electricity, a diverter allows you to store that energy as hot water, reducing your reliance on gas or electric boilers.
How Does a Solar Diverter Work?
Solar diverters continuously monitor your home’s energy usage and generation:
- If your solar panels are producing more electricity than your home is using, the surplus is detected
- Instead of exporting this excess energy, the diverter redirects it to your immersion heater
- This heats your water tank gradually using “free” solar energy
This process is automatic, efficient and doesn’t require any manual intervention.
Why Solar Diverters Are Ideal for Homes in East Anglia and the South East
Homes in the South East and East Anglia benefit from some of the highest solar irradiation levels in the UK, meaning more potential surplus energy is available during daylight hours.
This makes solar diverters especially valuable because:
- You’re more likely to generate surplus energy during spring and summer
- Hot water demand remains consistent year round
- You can significantly reduce reliance on gas – especially important with rising gas prices
Reduce Both Electricity and Gas Bills
A solar diverter delivers savings in two key ways; lower electricity bills and lower gas bills. By using more of your self-generated electricity, you reduce the amount you need to import from the grid. If your hot water is typically heated by a gas boiler, a diverter reduces how often your boiler needs to run.
Result: dual savings across both energy streams.
Solar Diverter vs Battery Storage: What’s the Difference?
While both technologies improve self-consumption, they serve different roles.
| Feature | Solar Diverter | Solar Battery |
| Stores energy as | Heat (hot water) | Electricity |
| Cost | Lower upfront | Higher upfront |
| Best for | Homes with immersion tanks | Full energy independence |
| ROI speed | Faster | Longer-term |
For many homeowners, a diverter offers a cost effective entry point into energy optimisation.
Key Benefits of Installing a Solar Diverter
- Increase solar self-consumption
- Reduce reliance on your gas boiler
- Lower overall household energy bills
- Maximise ROI from your solar PV system
- Reduce carbon footprint
Is a Solar Diverter Right for Your Home?
A solar diverter is particularly suitable if you have a hot water cylinder with an immersion heater and are planning on installing solar panels, but don’t want a solar battery. If you already have solar installed and are exporting surplus electricity, retrofitting a solar diverter will work for your property.
Why Choose SolarTherm UK?
At SolarTherm UK, we specialise in helping homeowners across the South East and East Anglia maximise the performance of their solar systems.
What sets us apart:
- Proven experience with residential solar installations and upgrades
- Transparent, honest advice tailored to your home
- High quality components and professional installation
- Ongoing support and system optimisation
We don’t just install solar – we help you get the most from every unit of energy you generate.
Final Thoughts
A solar diverter is one of the most cost effective ways to improve your solar setup. By converting excess electricity into usable heat, it bridges the gap between electricity and gas savings – something few other technologies can achieve so simply.
For homeowners in the South East and East Anglia, where solar generation potential is strong, installing a diverter can significantly accelerate your return on investment while reducing your reliance on traditional energy sources.
Contact SolarTherm UK today for a free, no obligation quote and design, tailored to your property, usage and future energy needs. No hard sell, just honest, expert advice – and the time you need to make an informed decision.
Your home. Your energy. Your future.
FAQs
How much can I save with a solar diverter?
Savings vary depending on usage, but many UK households save £100–£300 per year by reducing gas and electricity consumption.
Do I need a hot water tank?
Yes—solar diverters work by heating water via an immersion heater, so a cylinder is required.
Can I install a diverter with an existing solar system?
Absolutely. Most diverters are retrofittable and compatible with existing systems.
Will it work in winter?
Yes, but output is lower due to reduced solar generation. Most savings occur in spring and summer.
Is it better than a solar battery?
Not necessarily—it’s more affordable and offers faster payback but doesn’t store electricity for later use.
