Mark Cresswell
banner
markcresswell.bsky.social
Mark Cresswell
@markcresswell.bsky.social
Daddy to a small person. Husband to a philologist. GPU/Semiconductor architect, SW manager. Sustainable energy enthusiast. EV driver.
Blue (2023) boiler @ 65 degrees. Orange (2024) boiler at low temp, weather comp. Grey (2025) ASHP. Same house over 3 years. KWh per month for heating and hot water. Boiler optimisation and the heat pump install by Custom Renewables, Heat Geek.
August 24, 2025 at 4:05 PM
I did 24 kWh, which is a touch better than yesterday when I didn’t even manage 1 kWh 🤣
January 2, 2025 at 8:22 PM
Nice to see, no degradation in 18 months.
November 22, 2024 at 6:14 PM
I did ask for 100A upgrade, but National Grid no longer fit these to new domestic properties. The 80A can run at 100A for over 2 hours, but I’d just feel more comfortable if my typical load was comfortably within the limit.
November 22, 2024 at 10:38 AM
Despite the fud, heat pumps work just fine in the cold. Here’s ours keeping the whole house cosy, using barely 1.5 kW. (And we’re still waiting for the developer to fix the big gaps in the insulation).

#heatpump #ashp #stopburningstuff #snowday
November 19, 2024 at 10:59 AM
18.5 kWh in the W. Midlands, on 25 panels. Powerwall running the ASHP now.
November 17, 2024 at 5:17 PM
There’s an energy on here today, and it’s not just the sun shining down on my solar panels.
#solarpower #renewables #myenergi
November 14, 2024 at 12:18 PM