It's weird that heat pumps are seen as so exotic and complicated when they're really just air conditioners plus reversing valves.
this post was submitted on 26 Jan 2024
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- Air conditioners in UK houses are pretty weird and complicated
- Potentially having to rip out aall the (usually underfloor) pipe work and replace all your radiator is pretty complicated, compared to switching out the existing gas-fed box on the wall
- Working out the capacity needed to heat your home is pretty complicated
- Finding the space outside in a small urban garden than can take the unit, without annoying the neighbours next door with the noise can be pretty complicated.
The capacity calculations and potential noise complaints are the big ones imho.
I can definitely see issues with installers not giving a toss about noise, and having to be chased later.
Calculating capacity isn't that complicated, you can look everything up to work it out (wmk losses, etc.), but it is a step up from the current "slap a new boiler in" mentality.
And I wouldn't be surprised if most heating techs don't consider requirement at all when changing a boiler, they'll just put in a big one, and run the rads at 70 if the client complains.
There is talk about ASHPs that can still maintain efficiency at higher temps, which may help a lot of households avoid changing the radiators too. But it's still early days.
What an odd way to encourage people to get heat pumps.
‘It’s much simpler than you think : Experiment with your flow temperatures, get your pipes widened if necessary, and if that doesn’t work, get on twitter and hope that a random software engineer outside the industry can get you sorted ‘
It's more an article about the barriers that the industry needs to sort out, I think
I just had one installed in Canada during that -30C > -50C cold snap on the prairies. I paired it up with a backup LNG furnace for the coldest of cold snaps we get. It’s only been a couple of weeks but it has not warmed up enough for the pump to kick over. I plan to keep detailed notes this year to compare data.
A lot of the people I know and work with think these things are a fad/gimmick/wont work in Canada… I aim to prove them wrong!
-50C !!! When did that happen?
A couple of weeks ago on a Saturday. The actual outside temp was -50 overnight but “feels like” -60.
Here is a comment with a picture of my weather app from that weekend.
I'm curious about a similar setup, but want resistive electric heat instead of a gas furnace so that I could completely eliminate the gas bill since you pay fees wether you use gas or not.
Not my personal story, I hasten to add, but I found it very interesting.
Yeh, interesting article, ty
This explains why heat pumps are getting a bad reputation in the UK. Basically, no one knows how to install them properly.
I saw that about at week ago. Seems to be getting pushed in the algorithm.
The TL; DW for people:
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The installer didn't place the heat pump on a solid level base. This resulted in the unit not being level, which caused bearings to wear at a highly accelerated rate. Killed the unit in a couple of years.
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Hugely over-complicated plumbing install which introduced unnecessary heat exchanging between water loops and mixing of heated & return water. All introduced losses. The unnecessary components in the system just added expense.
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Due to the unnecessary losses, the heat pump had to run at a higher temperature for the system to work. Hence the heat pump was a much more expensive unit than really needed. (Dual stage with two refrigerants rather than single stage).
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The water tank used was unsuitable for a heat pump fed system, having too short a heat exchanger for the water temperature being fed to it.
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The system was set to a fixed temperature with no weather compensation curve. The system was always working as if it was a really cold day, killing its efficiency and putting it under more load than necessary.
The fix would be to simplify the system and reinstall the unit on a proper base, replacing it with a smaller cheaper one. Basically the guy was completely mis-sold by a dodgy company.