@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
Spark‑gap (electricity‑to‑gas unit‑cost ratio)
Electricity / Gas Unit Cost Ratio Comparison
[30 days, 01 Nov 2025 – 30 Nov 2025]
30 Nov 2025:
Spark-Gap Tracker: 4.61×
Electricity: £0.2246
Gas: £0.0487
Mean:
Spark-Gap Tracker: 4.74×
Electricity: £0.2319
Gas: £0.0490
Heat‑pump graphic
Heat‑pump graphic
Heat‑pump graphic
Heat‑pump graphic
Heat Pump IDs compared to the Boiler today:
280
Smart Octopus Tariffs
Cost and Energy Comparison
Carbon Intensity Over Time
Standard Deviation Analysis
Cost, Energy and Comfort Comparison
[30 Days | 1 Nov 25 to 30 Nov 25]
Boiler (Tracker) was cheaper by £9.12 (10.4 %) vs Heat Pump (Agile), or £0.16 after offsetting £8.96 gas stand. charge (30 d × £0.299)🥇🎉
Prices based on @octopus.energy tariffs 💚
Maybe contact radiator manufacturers, work with them on a smart radiator design where sensors are more concealed and get a royalties on sales 🤞💚 + a heat loss based thermostat and then each room maintains perfect temperature 🥳
01.12.2025 13:17 — 👍 0 🔁 0 💬 0 📌 0
Spark‑gap (electricity‑to‑gas unit‑cost ratio)
Electricity / Gas Unit Cost Ratio Comparison
[91 days, 01 Sep 2025 – 30 Nov 2025]
Yesterday:
Spark-Gap Tracker: 4.61×
Electricity: £0.2246
Gas: £0.0487
Mean:
Spark-Gap Tracker: 4.50×
Electricity: £0.2237
Gas: £0.0497
Heat‑pump graphic
Heat‑pump graphic
Heat‑pump graphic
Heat‑pump graphic
Heat Pump IDs compared to the Boiler today:
280
Smart Octopus Tariffs
Cost and Energy Comparison
Carbon Intensity Over Time
Standard Deviation Analysis
Cost, Energy and Comfort Comparison
[91 Days | 1 Sep 25 to 30 Nov 25]
Boiler (Tracker) was cheaper by £14.00 (8.6 %) vs Heat Pump (Agile), or £-13.17 after offsetting £27.17 gas stand. charge (91 d × £0.299)🥇🎉
Prices based on @octopus.energy tariffs 💚
Spark‑gap (electricity‑to‑gas unit‑cost ratio)
Electricity / Gas Unit Cost Ratio Comparison
[5 days, 25 Nov 2025 – 29 Nov 2025]
Yesterday:
Spark-Gap Tracker: 4.85×
Electricity: £0.2362
Gas: £0.0487
Mean:
Spark-Gap Tracker: 4.94×
Electricity: £0.2428
Gas: £0.0491
Heat‑pump graphic
Heat‑pump graphic
Heat‑pump graphic
Heat‑pump graphic
Heat Pump IDs compared to the Boiler today:
280
Smart Octopus Tariffs
Cost and Energy Comparison
Carbon Intensity Over Time
Standard Deviation Analysis
Cost, Energy and Comfort Comparison
[5 Days | 25 Nov 25 to 29 Nov 25]
Boiler (Tracker) was cheaper by £3.15 (16.8 %) vs Heat Pump (Agile), or £1.66 after offsetting £1.49 gas stand. charge (5 d × £0.299)🥇🎉
Prices based on @octopus.energy tariffs 💚
That's what I said indeed! 💚 Which one is it? It's both! 🥰 Any system can be improved! We can make many existing (modern) boilers more efficient while we transition to cleaner energy, and there are still more efficiencies to be unlocked with newer technologies too💚
25.11.2025 23:05 — 👍 0 🔁 0 💬 0 📌 0Absolutely, that’s what I said! 💚 If you have any more questions, feel free to ask away 💚
25.11.2025 18:25 — 👍 0 🔁 0 💬 1 📌 0
My boiler heats my home at lower flow temperatures than that of a typical heat pump 💚
25.11.2025 15:43 — 👍 0 🔁 0 💬 1 📌 0We never had incentives to make thermostat controllers better, they are good enough. Heat pumps though more efficient, suffer from the same poor thermostat controls that modern boilers use. And because they are clearly already efficient, there are no incentives to make controllers better.💚
25.11.2025 14:03 — 👍 1 🔁 0 💬 0 📌 0They are reasonable. For majority of modern gas condensing boilers, they perform poorly, due to poor thermostat controls. Manufactures data specs use 40-50 degrees for mean water temperature but would NOT have used controllers that make their operations efficient during their lab tests.
25.11.2025 14:03 — 👍 0 🔁 0 💬 3 📌 0All other points are sound 💚 heat pumps are great overall, we just need lower electricity prices 💚
25.11.2025 13:50 — 👍 0 🔁 0 💬 0 📌 0I fact checked the fact-check number 7. „Operating Heat Pumps is more Expensive than Gas Systems - The opposite is true“.
The statement “The opposite is true” is false. See below real world data, not just theoretical data spec from manufacturers.
Instead - it depends 💚
bsky.app/profile/show...
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! 💚
25.11.2025 10:17 — 👍 0 🔁 0 💬 0 📌 0Two findings:
1. It identifies the most likely target room temperature (identified mine at 20.5) 🎉 - see the blue arrows
2. Heat pumps can unlock 30% comfort improvements with the right thermostat controller 💚
@janrosenow.bsky.social @betatalk.bsky.social @openenergymon.bsky.social
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 💚
24.11.2025 23:09 — 👍 0 🔁 0 💬 2 📌 0
Spark‑gap (electricity‑to‑gas unit‑cost ratio)
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
Heat‑pump graphic
Heat‑pump graphic
Heat‑pump graphic
Heat‑pump graphic
Heat Pump IDs compared to the Boiler today:
138
Smart Octopus Tariffs
Cost and Energy Comparison
Carbon Intensity Over Time
Standard Deviation Analysis
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 💚
Spark‑gap (electricity‑to‑gas unit‑cost ratio)
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
Heat‑pump graphic
Heat‑pump graphic
Heat‑pump graphic
Heat‑pump graphic
Heat Pump IDs compared to the Boiler today:
280
Smart Octopus Tariffs
Cost and Energy Comparison
Carbon Intensity Over Time
Standard Deviation Analysis
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 💚
That’s a fantastic video, a lot of effort went into it. Sharing data and experiences helps us all understand our current position and future direction 💚
bsky.app/profile/show...
Gas prices have been lower this season and the trend is clearly downwards. This isn’t great news for transitioning to cleaner energy 💚
bsky.app/profile/show...
Spark‑gap (electricity‑to‑gas unit‑cost ratio)
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
Heat‑pump graphic
Heat‑pump graphic
Heat‑pump graphic
Heat‑pump graphic
Heat Pump IDs compared to the Boiler today:
138
