Savings and carbon estimator
What could a Heatloop change for your home?
Four questions, one honest estimate of yearly running cost and carbon, with the formula shown underneath. Sometimes the answer is “not much”, and we’d rather you knew.
The formula, with your numbers in it.
No hidden factors. Every price and efficiency below is a published assumption you can argue with.
1 · Heat
Typical yearly heat for your home type, adjusted for your region’s climate.
12,500 kWh × 1.10 = 13,750 kWh
2 · Now
Fuel needed at your system’s efficiency, times its unit price and its carbon factor.
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3 · Blend
The price a Heatloop pays on average: the share bought at the cheap rate, and the rest at the day rate.
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4 · Heatloop
Electricity needed at 95% overall efficiency (store losses included), times the blended price. Carbon uses illustrative grid averages of 0.11 kg/kWh at night and 0.19 kg/kWh by day.
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| Heating | Unit price | Efficiency | kg CO₂e per kWh |
|---|---|---|---|
| Gas boiler | 6.3p | 85% | 0.183 |
| Oil boiler | 7.8p | 85% | 0.247 |
| LPG boiler | 9.5p | 85% | 0.214 |
| Old storage heaters | 13.0p (blended) | 90% | 0.130 |
| Panel or direct electric | 24.5p | 100% | 0.165 |
| Heatloop, time-of-use | 6.5p night, 24.5p day; 92% at night | 95% | 0.11 / 0.19 |
| Heatloop, Economy 7 | 9.5p night, 27p day; 85% at night | 95% | 0.11 / 0.19 |
| Heatloop, single rate | 24.5p | 95% | 0.19 |
Illustrative unit prices. Typical heat use: flat 6,500 kWh, terrace 10,000 kWh, semi 12,500 kWh, detached 17,000 kWh a year.