Previously: [image] A Heat Pump That Thinks for Itself Hardware Previously: Every heat pump ships with an answer to the same question: given the weather outside, how hot should the water going to the radiators be? The answer is a line on a graph — cold outsid…

Hello @abidamr Well done getting to the bottom of all of this and finding the right solution for your home :clap: Totally agree, I’ve written about similar here Heat loss calculation — OpenEnergyMonitor 0.0.1 documentation , air change rates were one of the big factor that over-inflated heat loss,…

[image] abidamr: is almost always smaller, cheaper, and more manageable than the industry will tell you. I would say a lot of or at least the best parts of the industry is now up to speed with this - and it’s this insight that has made things like heat geek’s zero disrupt model possible.

One thing we have come to appreciate more recently is that over-sizing is not necessarily such a bad thing from a performance perspective - though this is hugely make/model specific. Over-sizing — OpenEnergyMonitor 0.0.1 documentation some heat pump models dont quite achieve their maximum outputs on…

Regarding the ACH, I have to be honest — your work gave me the confidence to go for 0.5 rather than the 1s and 2s suggested at the time when I was calculating my heat loss. I agree the industry is catching up on the right designs. As I was explaining to someone, it does take time for installers to g…

I really enjoyed your write up. I’ve been down this road too - somewhat similar, old house. The EPC (well out of date) suggests an 18KW heat loss - few installers will come near. I didn’t see a value in having a new EPC as I wasn’t convinced that it would fair any better. So I also set about lear…

It is a journey with ups, downs, doubts and nervousness but worth it at the end when it is over and done. After a year, the house is much comfortable and dryer. In addition, we can fine tune the heat pump to our needs unlike the boilers. We kept our wood burner which we use for those long and dark d…

Welcome to the forum @purrcat . (I wonder if your UserName gives a clue to one of your other interests :slightly_smiling_face:?) To add to the excellent guidance given above: If you (or your wife) would feel better with a bit of insurance, be aware that many HP models have downrated nameplate capa…

Thank you, both, for your comments. We do enjoy our wood burners and have no wish to remove them or not use them. For some reason, the previous owner of our house didn’t put any form of heating in two of our lounges aside from the wood burners. This causes a large temperature gradient on the ground…

The wood burner is also a safety net in case something happen with electricity and/or heat pump. But as you said we are not getting younger! Part of the design, and especially old house, spend little bit of time on the pipe sizing if adequate, especially the main run. I found quite important in my c…

Indeed, I do feel much more clued up than I was a few months ago. There is so much to learn but it’s good to keep the grey matter ticking over. There’s also a sense of satisfaction in participating in conversations with installers and not feeling like a dummy or feeling like they are treating me as …

Doing the Maths

Hardware Heatpump

Timbones (Tim) 13 August 2026 23:34 15

You might want to look into a different type of radiator that has a heat exchange (and optionally fans), which has significantly higher heat output than a traditional passive design.