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Last seen: Aug 9, 2026
Before I got a heat pump I turned down my gas boiler flow temperature from 70 to 50 which was the lowest it would go. The result was a much more comf...
OK. What Im seeing looks fairly normal TBH: 1 start per hour is good (1028 on off cycles in 1303 hours); there is no evidence of short cycling Un...
In general pure LWT mode will be more efficient because it means you are operating at the lowest flow temperature. It may well, depending on house, a...
Wow, that sounds like fun. There is another thread where someone with a Hitachi heat pump (featuring a more conventional vertical fan) describes a si...
@davidb Further to my previous post one further comment I would make is that 300l system volume is not consistent with 7 radiators. Unless you have a...
Since May 2025 it no longer a requirement in England to benefit from permitted development rights (ie planning consent without having to make a planni...
@davidb Once again I agree with Adrian. Houses have memory and different bits cool at different rates. So for example (this is just one mechanism...
I agree with the comments made by @adrian both about the fire and the DHW. You should also bear in mind that, with a low loss house, COP isnt so impo...
I think its small, but off course it could happen so please dont rely on it. They do a sample check of some kind on installers and my system was chec...
I have been wondering that myself. The fact is that, even with the buffer (meaning that the secondary pump doesn't have to push water through the pi...
The change in calculation methodology (which mandated BS EN 12831-1:2017 as opposed to the simpler calculation) were first published early in 2025 an...
That statement in itself (which I am not in anyway criticising) exposes the limitations (I originally wrote madness, but relented because they doubtle...
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Latest Posts
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RE: HomeTherma Is Live: A New Home-Energy Platform Built Around the Homeowner
Signed up!
By bobflux , 2 hours ago
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RE: Electricity price predictions
In our case, we constrain the charging level etc using ...
By Batpred , 2 hours ago
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Does minimum system volume matter in the context of sim...
By Tony.Stolz , 19 hours ago
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RE: Indevolt Batteries UK Support & Info Thread
I had a quick look and they are a little vague. They ...
By BlizzardGreen , 20 hours ago
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RE: Has anyone seen this problem before? Huge anticycling times
Oh dear. Glad it was replaced. I have been mighty imp...
By JamesPa , 1 day ago
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RE: Can I start an argument about buffer tanks please? 🙂
Dont, just adjust the LSVs to get different temperature...
By JamesPa , 2 days ago
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RE: Heat pump running costs – what has actually worked for you?
I installed the air source heat pump in January 2026, i...
By bobflux , 2 days ago
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RE: Grant Aerona Air to Water R290 6.5 kW - Quiet Mark and Silent Running
Thats all interesting. DHW on my Vailant seems to respe...
By JamesPa , 2 days ago
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RE: Do I need to change the control unit when replacing my Ecodan Air Source Heat Pump
One of the other mods has just reminded me that @ashp-b...
By Majordennisbloodnok , 2 days ago
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RE: PV and battery long payback - sense check query
@old_scientist I have now drafted 2 replies - both have...
By DavidB , 4 days ago
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RE: Air source heat pump roll call – what heat pump brand and model do you have?
Forum Handle: adrian Manufacturer: Appliandirect.co....
By Adrian , 4 days ago
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