How loan size, interest rate and term change what you pay. These are illustrations, not quotes.
Last reviewed 3 November 2026 · Independent guide, not affiliated with the UK Government
The examples assume a fixed rate and equal monthly payments with no fees. Your lender’s figures will differ, so always compare the total amount repayable on your actual offer.
| Loan | Rate | Term | Monthly | Total repaid |
|---|---|---|---|---|
| £6,500 | 0% | 10 years | £54 | £6,500 |
| £6,500 | 3% | 10 years | £63 | £7,532 |
| £10,000 | 0% | 7 years | £119 | £10,000 |
| £10,000 | 3% | 7 years | £132 | £11,099 |
| £10,000 | 8% (standard loan) | 7 years | £156 | £13,092 |
| £15,000 | 3% | 15 years | £104 | £18,646 |
The government’s own example: borrowing £10,000 at 8% over seven years costs around £155 a month, and the scheme could save up to £285 a year on repayments.
Savings on bills
The government estimates a heat pump, battery and solar panels together could save a household up to £550 a year on energy bills, or £850 with a time-of-use tariff. Savings depend on your home, usage and tariff.
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