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Last seen: Jan 28, 2026
Hi @iancalderbank , Swapped over probes looked like a similar diff initially, but now since running speed 3 on secondary pump these temps seem to ha...
Other photos seem to show a size diff that would indicate 28mm main or more, then 22mm, then 15mm copper at the end. The 22mm branches seem to be for...
Thanks @iancalderbank - waiting for the plumber to confirm the sizing as that was just the builder's guess
@iancalderbank - builder believes it's a standard 22mm flow and return into a 15mm drop for the rads. But is confirming with the plumbers
So all in all I see: Top right of LLH versus pipe in plant room leading to heating zone: 1C drop Total drops with drop from zone pipe to r...
Thanks Ian, I'll ask this with the plumbers. I think upstairs looks to be running of this also, as I know that's approx where a rad is above this ro...
Hi Toodles, don't think any outside. The plant room is all lagged. And the ASHP has a pretty heavy duty underground insulated set (I think further b...
From photos I have of when the project was in progress looks like the pipe work is in the ceilings, plastic, then runs down the walls are metal. Thos...
Thanks Toodles.Here's probably a stupid question. I notice: (Grant panel) LWT on Grant panel (I think this never shows .5C rounded to nearest 1)...
Thanks Toodles, I hope so for sure. That 1.5C max uplift to LWT puts about 1C extra into the system at current temps, and really felt that upstairs. ...
I think it’s safe to say the rads downstairs appear to be the issue. Keeping upstairs on but reducing lock shields down does seem to have reduced cy...
thanks Derek. I’ll try and push for the LLH to volumiser as well as simplification of zones. The DHW cycle heating upstairs was an oversight of the he...
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Latest Posts
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RE: Has anyone seen this problem before? Huge anticycling times
Mine was replaced as they couldn’t fix and couldn’t ide...
By cg360 , 4 hours 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 , 6 hours 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 , 9 hours 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 , 14 hours 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 , 15 hours ago
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RE: Electricity price predictions
So a final update on Charge Pack, now I have nearly rea...
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RE: Indevolt Batteries UK Support & Info Thread
My ideal install would have my battery installed before...
By BlizzardGreen , 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 , 2 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....
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RE: Acond heat pump failed after four years - diagnostic quote £940 plus VAT
@downfield Thank you Downfield. This sounds potenti...
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RE: Digest of UK Energy Statistics
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