Solar Thermal Installers in Derry

Check that the installer is on the SEAI register, as this is required to claim the €1,200 solar thermal grant. A good installer should assess your hot water usage and recommend the right collector size (typically 2–4 panels for a family home). Compare at least 2–3 quotes in Derry, ask for references, and verify they have experience with solar thermal specifically — not just solar PV.

A typical solar thermal installation in Derry costs €3,000–€5,500 before the SEAI grant, depending on whether you choose flat plate or evacuated tube collectors and whether a new hot water cylinder is needed. After the €1,200 grant, the net cost is usually €1,800–€4,300. Evacuated tubes (e.g. Thermomax, Kingspan) cost more but perform better in Irish weather.

Not all installers are SEAI registered. You must use an SEAI-registered installer to qualify for the €1,200 grant. The SEAI maintains a public register at seai.ie. On this page, all listed installers serve Derry. Look for the “SEAI Registered” badge on each listing.

In most cases, yes. Solar thermal requires a twin-coil hot water cylinder — one coil for the solar circuit and one for your backup boiler. If your existing cylinder only has a single coil, it will need to be replaced. A new 300-litre twin-coil cylinder typically costs €500–€800 as part of the installation. Ask your installer whether a new cylinder is included in the quote.

A well-sized solar thermal system typically provides 50–70% of your annual hot water needs. In summer months (May–September), solar thermal can meet nearly all your hot water demand. In winter, your backup boiler or immersion will cover the shortfall. A typical family of 4 needs a 2–4 panel system with a 200–300 litre cylinder.