Installation of Solar Thermal Panels
Because solar water heating systems are now so popular there are plenty of knowledgeable tradesmen qualified to install your system. The installer must be accredited by the Microgeneration Certification Scheme (MCS) for you to qualify for the Renewable Heat Incentive and RHPP.
You will need to decide whether to use flat collectors, which can be fitted more flush with the roof, or evacuated tubes, which are more efficient. For more details on the different types of collectors take a look at How do solar water heating systems work?
You will need to ensure the following:
- Location – You will need suitable space (around 5m2) on a south facing roof which is in direct sunlight for the vast majority of the day. Ideally the collectors should be angled at a 30 degree angle of incidence. The collectors can be fitted to a flat roof if they are attached to a frame to allow them to be angled correctly.
- Roof durability – You will need to check with your installer that the installation will not damage the integrity of your roof and that your roof is strong enough to bear the collectors as they can be heavy.
- Space for a solar cylinder – A large hot water cylinder will be required to store your heated water; this is typically between 30 and 60 litres. This can either be a dedicated solar cylinder or it might be possible to add a solar heating coil to your existing cylinder if it is large enough.
- Compatibility with your boiler – Most boilers are compatible, however a Combi (Combination) boiler doesn’t normally have a hot water cylinder and therefore may not be compatible.
- Planning Permission – On the whole you will not need planning permission if the collectors aren’t more than 20cm taller than your roof. However, if you live in a Listed Building, a building in a Conservation Area or a World Heritage Site, it is a good idea to consult your local authority.
Time to install
The time it takes to install a solar thermal system will depend on the size of the system and the roof’s integrity, as well as how the system is going to link into the existing water system.
We only recommend installers that are MCS accredited: Always use an MCS accredited installer. Only MCS accredited installers are able to sign off installations that will comply with the government’s Renewable Heat Incentive scheme.
- Do I need planning permission to install solar thermal panels?
- Roof mounted solar thermal systems do not usually need planning permission unless they exceed a certain height, or if the property is listed or in a conservation area. However, it is best to check your local authority's information. Take a look at our Planning Permissions page for further information on the permissions in your area.
- Will my roof be strong enough to take solar thermal panels?
- Most roofs are strong enough to take a solar thermal installation without any reinforcement. Your installer will be able to advise you further; you can find out more about the Installation of Solar Thermal Panels here.
- Are solar thermal collectors or panels fragile?
- Not typically - they are designed to withstand the elements so they should be quite robust. All MCS accredited products should last their predicted 20 year lifetime.
- Can I power my solar thermal water circulation pump with a solar photovoltaic (PV) panel?
- It is possible to do this, but these systems end up being less efficient as there will be times when there isn't enough sunshine for the solar PV panel to work, but there is a need for heating from your solar thermal system which will require the circulation pump to work.
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