A fair comparison uses the same useful heat and separates self-used solar from exported electricity.
Online estimates are screening tools; building suitability and installation design need competent assessment.
Heat first
Estimate annual useful heat and a realistic seasonal performance.
Solar timing
Direct use avoids import; export earns its own rate.
Electrical capacity
Check consumer unit, connection, controls and coincident loads.
Economics
Include maintenance, replacement, finance and realistic tariff scenarios.
Frequently asked questions
Will solar run a heat pump all winter?
Do not assume so. Seasonal solar production and heating demand often move in opposite directions.
How current are the figures?
Each page shows its review date. Your live tariff and the latest official publication always take priority.
Sources and review date
Content reviewed on: 2026-08-03.
- GOV.UK – check whether a heat pump may suit your home — official household checker
- Ofgem – Smart Export Guarantee — payments for eligible exported electricity