Efficient Gas Boiler and Climate Control
@showpiece.bsky.social
Goals:
1. Climate comfort - where you can’t tell whether heating is on or off and you feel comfortable
2. Efficient boiler to minimise costs and pollution
GitHub:
https://github.com/Alexwijn/SAT/discussions/40
1. Climate comfort - where you can’t tell whether heating is on or off and you feel comfortable
2. Efficient boiler to minimise costs and pollution
GitHub:
https://github.com/Alexwijn/SAT/discussions/40
SAT thermostat controller pushes the boundaries of physics. Overnight room temperature precision range of 0.06 degrees unfiltered or 0.026 degrees filtered 💚 @janrosenow.bsky.social @openenergymon.bsky.social Heat pumps can unlock this efficiency too! 💚
November 25, 2025 at 10:17 AM
SAT thermostat controller pushes the boundaries of physics. Overnight room temperature precision range of 0.06 degrees unfiltered or 0.026 degrees filtered 💚 @janrosenow.bsky.social @openenergymon.bsky.social Heat pumps can unlock this efficiency too! 💚
Small but important tweak to the comfort comparison graph. To derive the overall mean for each system it now only uses room temperature data from the heating season, and only when the outside temperature is 10°C or below, which is when the heating is very likely to be on 💚
November 24, 2025 at 11:09 PM
Small but important tweak to the comfort comparison graph. To derive the overall mean for each system it now only uses room temperature data from the heating season, and only when the outside temperature is 10°C or below, which is when the heating is very likely to be on 💚
Electricity / Gas Unit Cost Ratio Comparison
[579 days, 24 Apr 2024 – 23 Nov 2025]
Yesterday:
Spark-Gap Tracker: 4.62×
Electricity: £0.2299
Gas: £0.0498
Mean:
Spark-Gap Tracker: 4.35×
Electricity: £0.2252
Gas: £0.0521
[579 days, 24 Apr 2024 – 23 Nov 2025]
Yesterday:
Spark-Gap Tracker: 4.62×
Electricity: £0.2299
Gas: £0.0498
Mean:
Spark-Gap Tracker: 4.35×
Electricity: £0.2252
Gas: £0.0521
November 24, 2025 at 5:20 AM
Electricity / Gas Unit Cost Ratio Comparison
[579 days, 24 Apr 2024 – 23 Nov 2025]
Yesterday:
Spark-Gap Tracker: 4.62×
Electricity: £0.2299
Gas: £0.0498
Mean:
Spark-Gap Tracker: 4.35×
Electricity: £0.2252
Gas: £0.0521
[579 days, 24 Apr 2024 – 23 Nov 2025]
Yesterday:
Spark-Gap Tracker: 4.62×
Electricity: £0.2299
Gas: £0.0498
Mean:
Spark-Gap Tracker: 4.35×
Electricity: £0.2252
Gas: £0.0521
November 24, 2025 at 5:20 AM
Cost, Energy and Comfort Comparison
[579 Days | 24 Apr 24 to 23 Nov 25]
Boiler (Tracker) was cheaper by £134.02 (11.4 %) vs Heat Pump (Agile), or £-29.64 after offsetting £163.66 gas stand. charge (579 d × £0.283)🥇🎉
Prices based on @octopus.energy tariffs 💚
[579 Days | 24 Apr 24 to 23 Nov 25]
Boiler (Tracker) was cheaper by £134.02 (11.4 %) vs Heat Pump (Agile), or £-29.64 after offsetting £163.66 gas stand. charge (579 d × £0.283)🥇🎉
Prices based on @octopus.energy tariffs 💚
November 24, 2025 at 5:20 AM
Cost, Energy and Comfort Comparison
[579 Days | 24 Apr 24 to 23 Nov 25]
Boiler (Tracker) was cheaper by £134.02 (11.4 %) vs Heat Pump (Agile), or £-29.64 after offsetting £163.66 gas stand. charge (579 d × £0.283)🥇🎉
Prices based on @octopus.energy tariffs 💚
[579 Days | 24 Apr 24 to 23 Nov 25]
Boiler (Tracker) was cheaper by £134.02 (11.4 %) vs Heat Pump (Agile), or £-29.64 after offsetting £163.66 gas stand. charge (579 d × £0.283)🥇🎉
Prices based on @octopus.energy tariffs 💚
Electricity / Gas Unit Cost Ratio Comparison
[30 days, 01 Nov 2024 – 30 Nov 2024]
30 Nov 2024:
Spark-Gap Tracker: 3.82×
Electricity: £0.2360
Gas: £0.0617
Mean:
Spark-Gap Tracker: 4.04×
Electricity: £0.2405
Gas: £0.0596
[30 days, 01 Nov 2024 – 30 Nov 2024]
30 Nov 2024:
Spark-Gap Tracker: 3.82×
Electricity: £0.2360
Gas: £0.0617
Mean:
Spark-Gap Tracker: 4.04×
Electricity: £0.2405
Gas: £0.0596
November 23, 2025 at 5:05 AM
Electricity / Gas Unit Cost Ratio Comparison
[30 days, 01 Nov 2024 – 30 Nov 2024]
30 Nov 2024:
Spark-Gap Tracker: 3.82×
Electricity: £0.2360
Gas: £0.0617
Mean:
Spark-Gap Tracker: 4.04×
Electricity: £0.2405
Gas: £0.0596
[30 days, 01 Nov 2024 – 30 Nov 2024]
30 Nov 2024:
Spark-Gap Tracker: 3.82×
Electricity: £0.2360
Gas: £0.0617
Mean:
Spark-Gap Tracker: 4.04×
Electricity: £0.2405
Gas: £0.0596
November 23, 2025 at 5:05 AM
Cost, Energy and Comfort Comparison
[30 Days | 1 Nov 24 to 30 Nov 24]
Heat Pump (Cosy) was cheaper by £6.13 (6.2 %) vs Boiler (Tracker), or £14.37 after offsetting £8.24 gas stand. charge (30 d × £0.275)🥇🎉
Prices based on @octopus.energy tariffs 💚
[30 Days | 1 Nov 24 to 30 Nov 24]
Heat Pump (Cosy) was cheaper by £6.13 (6.2 %) vs Boiler (Tracker), or £14.37 after offsetting £8.24 gas stand. charge (30 d × £0.275)🥇🎉
Prices based on @octopus.energy tariffs 💚
November 23, 2025 at 5:05 AM
Cost, Energy and Comfort Comparison
[30 Days | 1 Nov 24 to 30 Nov 24]
Heat Pump (Cosy) was cheaper by £6.13 (6.2 %) vs Boiler (Tracker), or £14.37 after offsetting £8.24 gas stand. charge (30 d × £0.275)🥇🎉
Prices based on @octopus.energy tariffs 💚
[30 Days | 1 Nov 24 to 30 Nov 24]
Heat Pump (Cosy) was cheaper by £6.13 (6.2 %) vs Boiler (Tracker), or £14.37 after offsetting £8.24 gas stand. charge (30 d × £0.275)🥇🎉
Prices based on @octopus.energy tariffs 💚
Electricity / Gas Unit Cost Ratio Comparison
[365 days, 22 Nov 2024 – 21 Nov 2025]
Yesterday:
Spark-Gap Tracker: 5.34×
Electricity: £0.2724
Gas: £0.0510
Mean:
Spark-Gap Tracker: 4.25×
Electricity: £0.2293
Gas: £0.0543
[365 days, 22 Nov 2024 – 21 Nov 2025]
Yesterday:
Spark-Gap Tracker: 5.34×
Electricity: £0.2724
Gas: £0.0510
Mean:
Spark-Gap Tracker: 4.25×
Electricity: £0.2293
Gas: £0.0543
November 22, 2025 at 5:13 AM
Electricity / Gas Unit Cost Ratio Comparison
[365 days, 22 Nov 2024 – 21 Nov 2025]
Yesterday:
Spark-Gap Tracker: 5.34×
Electricity: £0.2724
Gas: £0.0510
Mean:
Spark-Gap Tracker: 4.25×
Electricity: £0.2293
Gas: £0.0543
[365 days, 22 Nov 2024 – 21 Nov 2025]
Yesterday:
Spark-Gap Tracker: 5.34×
Electricity: £0.2724
Gas: £0.0510
Mean:
Spark-Gap Tracker: 4.25×
Electricity: £0.2293
Gas: £0.0543
November 22, 2025 at 5:13 AM
Cost, Energy and Comfort Comparison
[365 Days | 22 Nov 24 to 21 Nov 25]
Boiler (Tracker) was cheaper by £90.63 (10.4 %) vs Heat Pump (Agile), or £-14.20 after offsetting £104.83 gas stand. charge (365 d × £0.287)🥇🎉
Prices based on @octopus.energy tariffs 💚
[365 Days | 22 Nov 24 to 21 Nov 25]
Boiler (Tracker) was cheaper by £90.63 (10.4 %) vs Heat Pump (Agile), or £-14.20 after offsetting £104.83 gas stand. charge (365 d × £0.287)🥇🎉
Prices based on @octopus.energy tariffs 💚
November 22, 2025 at 5:13 AM
Cost, Energy and Comfort Comparison
[365 Days | 22 Nov 24 to 21 Nov 25]
Boiler (Tracker) was cheaper by £90.63 (10.4 %) vs Heat Pump (Agile), or £-14.20 after offsetting £104.83 gas stand. charge (365 d × £0.287)🥇🎉
Prices based on @octopus.energy tariffs 💚
[365 Days | 22 Nov 24 to 21 Nov 25]
Boiler (Tracker) was cheaper by £90.63 (10.4 %) vs Heat Pump (Agile), or £-14.20 after offsetting £104.83 gas stand. charge (365 d × £0.287)🥇🎉
Prices based on @octopus.energy tariffs 💚
Electricity / Gas Unit Cost Ratio Comparison
[180 days, 25 May 2025 – 20 Nov 2025]
Yesterday:
Spark-Gap Tracker: 4.86×
Electricity: £0.2494
Gas: £0.0513
Mean:
Spark-Gap Tracker: 4.40×
Electricity: £0.2227
Gas: £0.0507
[180 days, 25 May 2025 – 20 Nov 2025]
Yesterday:
Spark-Gap Tracker: 4.86×
Electricity: £0.2494
Gas: £0.0513
Mean:
Spark-Gap Tracker: 4.40×
Electricity: £0.2227
Gas: £0.0507
November 21, 2025 at 5:09 AM
Electricity / Gas Unit Cost Ratio Comparison
[180 days, 25 May 2025 – 20 Nov 2025]
Yesterday:
Spark-Gap Tracker: 4.86×
Electricity: £0.2494
Gas: £0.0513
Mean:
Spark-Gap Tracker: 4.40×
Electricity: £0.2227
Gas: £0.0507
[180 days, 25 May 2025 – 20 Nov 2025]
Yesterday:
Spark-Gap Tracker: 4.86×
Electricity: £0.2494
Gas: £0.0513
Mean:
Spark-Gap Tracker: 4.40×
Electricity: £0.2227
Gas: £0.0507
November 21, 2025 at 5:08 AM
Cost, Energy and Comfort Comparison
[180 Days | 25 May 25 to 20 Nov 25]
Boiler (Tracker) was cheaper by £29.23 (14.7 %) vs Heat Pump (Agile), or £-24.52 after offsetting £53.75 gas stand. charge (180 d × £0.299)🥇🎉
Prices based on @octopus.energy tariffs 💚
[180 Days | 25 May 25 to 20 Nov 25]
Boiler (Tracker) was cheaper by £29.23 (14.7 %) vs Heat Pump (Agile), or £-24.52 after offsetting £53.75 gas stand. charge (180 d × £0.299)🥇🎉
Prices based on @octopus.energy tariffs 💚
November 21, 2025 at 5:08 AM
Cost, Energy and Comfort Comparison
[180 Days | 25 May 25 to 20 Nov 25]
Boiler (Tracker) was cheaper by £29.23 (14.7 %) vs Heat Pump (Agile), or £-24.52 after offsetting £53.75 gas stand. charge (180 d × £0.299)🥇🎉
Prices based on @octopus.energy tariffs 💚
[180 Days | 25 May 25 to 20 Nov 25]
Boiler (Tracker) was cheaper by £29.23 (14.7 %) vs Heat Pump (Agile), or £-24.52 after offsetting £53.75 gas stand. charge (180 d × £0.299)🥇🎉
Prices based on @octopus.energy tariffs 💚
Electricity / Gas Unit Cost Ratio Comparison
[90 days, 22 Aug 2025 – 19 Nov 2025]
Yesterday:
Spark-Gap Tracker: 4.64×
Electricity: £0.2402
Gas: £0.0518
Mean:
Spark-Gap Tracker: 4.44×
Electricity: £0.2213
Gas: £0.0498
[90 days, 22 Aug 2025 – 19 Nov 2025]
Yesterday:
Spark-Gap Tracker: 4.64×
Electricity: £0.2402
Gas: £0.0518
Mean:
Spark-Gap Tracker: 4.44×
Electricity: £0.2213
Gas: £0.0498
November 20, 2025 at 5:06 AM
Electricity / Gas Unit Cost Ratio Comparison
[90 days, 22 Aug 2025 – 19 Nov 2025]
Yesterday:
Spark-Gap Tracker: 4.64×
Electricity: £0.2402
Gas: £0.0518
Mean:
Spark-Gap Tracker: 4.44×
Electricity: £0.2213
Gas: £0.0498
[90 days, 22 Aug 2025 – 19 Nov 2025]
Yesterday:
Spark-Gap Tracker: 4.64×
Electricity: £0.2402
Gas: £0.0518
Mean:
Spark-Gap Tracker: 4.44×
Electricity: £0.2213
Gas: £0.0498
November 20, 2025 at 5:06 AM
Cost, Energy and Comfort Comparison
[90 Days | 22 Aug 25 to 19 Nov 25]
Boiler (Tracker) was cheaper by £7.44 (6.0 %) vs Heat Pump (Agile), or £-19.43 after offsetting £26.88 gas stand. charge (90 d × £0.299)🥇🎉
Prices based on @octopus.energy tariffs 💚
[90 Days | 22 Aug 25 to 19 Nov 25]
Boiler (Tracker) was cheaper by £7.44 (6.0 %) vs Heat Pump (Agile), or £-19.43 after offsetting £26.88 gas stand. charge (90 d × £0.299)🥇🎉
Prices based on @octopus.energy tariffs 💚
November 20, 2025 at 5:06 AM
Cost, Energy and Comfort Comparison
[90 Days | 22 Aug 25 to 19 Nov 25]
Boiler (Tracker) was cheaper by £7.44 (6.0 %) vs Heat Pump (Agile), or £-19.43 after offsetting £26.88 gas stand. charge (90 d × £0.299)🥇🎉
Prices based on @octopus.energy tariffs 💚
[90 Days | 22 Aug 25 to 19 Nov 25]
Boiler (Tracker) was cheaper by £7.44 (6.0 %) vs Heat Pump (Agile), or £-19.43 after offsetting £26.88 gas stand. charge (90 d × £0.299)🥇🎉
Prices based on @octopus.energy tariffs 💚
I’ll replace my gas boiler with a heat pump when it dies 💚 but in the meantime, I did upgrade some of my radiators and install fans. Now the system operates at very low temperatures even lower than a typical heat pump 💚☺️
emoncms.org/app/view?nam...
gasboiler.grafana.net/public-dashb...
emoncms.org/app/view?nam...
gasboiler.grafana.net/public-dashb...
November 19, 2025 at 2:24 PM
I’ll replace my gas boiler with a heat pump when it dies 💚 but in the meantime, I did upgrade some of my radiators and install fans. Now the system operates at very low temperatures even lower than a typical heat pump 💚☺️
emoncms.org/app/view?nam...
gasboiler.grafana.net/public-dashb...
emoncms.org/app/view?nam...
gasboiler.grafana.net/public-dashb...
Electricity / Gas Unit Cost Ratio Comparison
[30 days, 20 Oct 2025 – 18 Nov 2025]
Yesterday:
Spark-Gap Tracker: 4.79×
Electricity: £0.2469
Gas: £0.0516
Mean:
Spark-Gap Tracker: 4.45×
Electricity: £0.2170
Gas: £0.0488
[30 days, 20 Oct 2025 – 18 Nov 2025]
Yesterday:
Spark-Gap Tracker: 4.79×
Electricity: £0.2469
Gas: £0.0516
Mean:
Spark-Gap Tracker: 4.45×
Electricity: £0.2170
Gas: £0.0488
November 19, 2025 at 5:05 AM
Electricity / Gas Unit Cost Ratio Comparison
[30 days, 20 Oct 2025 – 18 Nov 2025]
Yesterday:
Spark-Gap Tracker: 4.79×
Electricity: £0.2469
Gas: £0.0516
Mean:
Spark-Gap Tracker: 4.45×
Electricity: £0.2170
Gas: £0.0488
[30 days, 20 Oct 2025 – 18 Nov 2025]
Yesterday:
Spark-Gap Tracker: 4.79×
Electricity: £0.2469
Gas: £0.0516
Mean:
Spark-Gap Tracker: 4.45×
Electricity: £0.2170
Gas: £0.0488
November 19, 2025 at 5:05 AM
Cost, Energy and Comfort Comparison
[30 Days | 20 Oct 25 to 18 Nov 25]
Heat Pump (Agile) was cheaper by £2.93 (5.4 %) vs Boiler (Tracker), or £11.89 after offsetting £8.96 gas stand. charge (30 d × £0.299)🥇🎉
Prices based on @octopus.energy tariffs 💚
[30 Days | 20 Oct 25 to 18 Nov 25]
Heat Pump (Agile) was cheaper by £2.93 (5.4 %) vs Boiler (Tracker), or £11.89 after offsetting £8.96 gas stand. charge (30 d × £0.299)🥇🎉
Prices based on @octopus.energy tariffs 💚
November 19, 2025 at 5:05 AM
Cost, Energy and Comfort Comparison
[30 Days | 20 Oct 25 to 18 Nov 25]
Heat Pump (Agile) was cheaper by £2.93 (5.4 %) vs Boiler (Tracker), or £11.89 after offsetting £8.96 gas stand. charge (30 d × £0.299)🥇🎉
Prices based on @octopus.energy tariffs 💚
[30 Days | 20 Oct 25 to 18 Nov 25]
Heat Pump (Agile) was cheaper by £2.93 (5.4 %) vs Boiler (Tracker), or £11.89 after offsetting £8.96 gas stand. charge (30 d × £0.299)🥇🎉
Prices based on @octopus.energy tariffs 💚
Gas consumption is currently about 3kW at 1.6°C outside and should be around 4.2kW at -3°C outside. Perfect room temperature maintained. Well done to the Heat Pump > Agile team 🍃💚🥳 Gas boiler 2nd cheapest 🙃
bsky.app/profile/show...
gasboiler.grafana.net/public-dashb...
emoncms.org/app/view?nam...
bsky.app/profile/show...
gasboiler.grafana.net/public-dashb...
emoncms.org/app/view?nam...
November 18, 2025 at 5:54 AM
Gas consumption is currently about 3kW at 1.6°C outside and should be around 4.2kW at -3°C outside. Perfect room temperature maintained. Well done to the Heat Pump > Agile team 🍃💚🥳 Gas boiler 2nd cheapest 🙃
bsky.app/profile/show...
gasboiler.grafana.net/public-dashb...
emoncms.org/app/view?nam...
bsky.app/profile/show...
gasboiler.grafana.net/public-dashb...
emoncms.org/app/view?nam...
Electricity / Gas Unit Cost Ratio Comparison
[20 days, 29 Oct 2025 – 17 Nov 2025]
Yesterday:
Spark-Gap Tracker: 4.66×
Electricity: £0.2341
Gas: £0.0503
Mean:
Spark-Gap Tracker: 4.60×
Electricity: £0.2225
Gas: £0.0484
[20 days, 29 Oct 2025 – 17 Nov 2025]
Yesterday:
Spark-Gap Tracker: 4.66×
Electricity: £0.2341
Gas: £0.0503
Mean:
Spark-Gap Tracker: 4.60×
Electricity: £0.2225
Gas: £0.0484
November 18, 2025 at 5:05 AM
Electricity / Gas Unit Cost Ratio Comparison
[20 days, 29 Oct 2025 – 17 Nov 2025]
Yesterday:
Spark-Gap Tracker: 4.66×
Electricity: £0.2341
Gas: £0.0503
Mean:
Spark-Gap Tracker: 4.60×
Electricity: £0.2225
Gas: £0.0484
[20 days, 29 Oct 2025 – 17 Nov 2025]
Yesterday:
Spark-Gap Tracker: 4.66×
Electricity: £0.2341
Gas: £0.0503
Mean:
Spark-Gap Tracker: 4.60×
Electricity: £0.2225
Gas: £0.0484
November 18, 2025 at 5:05 AM
Cost, Energy and Comfort Comparison
[20 Days | 29 Oct 25 to 17 Nov 25]
Heat Pump (Agile) was cheaper by £1.88 (5.3 %) vs Boiler (Tracker), or £7.85 after offsetting £5.97 gas stand. charge (20 d × £0.299)🥇🎉
Prices based on @octopus.energy tariffs 💚
[20 Days | 29 Oct 25 to 17 Nov 25]
Heat Pump (Agile) was cheaper by £1.88 (5.3 %) vs Boiler (Tracker), or £7.85 after offsetting £5.97 gas stand. charge (20 d × £0.299)🥇🎉
Prices based on @octopus.energy tariffs 💚
November 18, 2025 at 5:05 AM
Cost, Energy and Comfort Comparison
[20 Days | 29 Oct 25 to 17 Nov 25]
Heat Pump (Agile) was cheaper by £1.88 (5.3 %) vs Boiler (Tracker), or £7.85 after offsetting £5.97 gas stand. charge (20 d × £0.299)🥇🎉
Prices based on @octopus.energy tariffs 💚
[20 Days | 29 Oct 25 to 17 Nov 25]
Heat Pump (Agile) was cheaper by £1.88 (5.3 %) vs Boiler (Tracker), or £7.85 after offsetting £5.97 gas stand. charge (20 d × £0.299)🥇🎉
Prices based on @octopus.energy tariffs 💚