Solar PV vs solar thermal compares generating electricity with collecting heat. Both use sunlight, but serve different needs. The best fit depends on demand, roof space and the existing heating system.
What does each system produce?
Photovoltaic panels generate electricity, which an inverter converts for household use. Surplus can be exported under an eligible arrangement or stored in a suitable battery.
Solar thermal collectors transfer heat through a designed circuit, commonly to a hot-water cylinder. Suitability depends on hot-water demand, cylinder compatibility, space and the rest of the heating system.
Which makes better use of the roof?
Do not compare conversion percentages alone: electricity and low-temperature heat have different uses. Model useful output against the demand it actually replaces. Summer surplus hot water may not deliver the value suggested by total collected energy.
Can solar PV heat water?
Yes, through an appropriate electrical arrangement, such as an immersion diverter or by supporting electricity used by a heat pump. Compare displaced heating energy with export income and other uses of the electricity.
Cost and maintenance
Compare complete quotations, including roof access, cylinder or electrical work, controls and maintenance. Solar thermal has a fluid circuit and associated components; PV has electrical conversion and protection equipment. Both need product-specific care.
Do not rely on historical Renewable Heat Incentive references as an open offer for a new installation. Check current support directly with the relevant scheme.
What does Renew-Able offer?
Our solar PV service focuses on electricity generation. We can assess it alongside storage and heat-pump requirements. Contact us with your roof and demand details.
Reviewed 27 September 2026.
