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Last seen: Aug 23, 2026
What sort of system did you end up with, what manufacturer heat pump and what are its settings? There are many contributors on here who will be very...
There is a factor which is glaring to me which is average heat loss with IAT of 18.5 (ish) versus std calculation temp of 21 for living areas. So 7kW ...
For the OP we found heating the house with the gas boiler with manual WCand our limit of lower water leaving temperature of 60C (since DHW could not b...
That sort of heat loss isn’t in any calculation I know and therefore there will be no improvement to show. BUT as a result the std survey won’t find i...
I strongly recommend a door pressure test. We had one done for ~£300 and it showed our air leakage was less than one air change per hour. Since we hav...
Our newly fitted shower system was regularly running to cold if paused. The excellent plumber fitting the ashp solved it by fitting a pressure control...
When our condensing boiler was fitted 14 years ago (too big but who cared?) we were told very clearly that it only needed to be on high when winter wa...
Vaillant service for the application installation was great, one engineer visit and 4 extensive replies from the help desk. BUT tbh it should have bee...
Heatpunk is very good and I was able to get an accurate result from thatwhich agreed with the sanity check of the annual gas bill. if you want to do...
I think I have only just understood a point that I think @transparent has made a couple of times. As a direct consequence of there only being one U...
We’ve just had a Vaillant installed (literally finished today) and the installer (Heatgeek elite) and Vaillant support has been excellent. So personal...
A separate reply about ventilation. The heat loss survey method includes heat loss through ventilation both deliberate and unplanned (otherwise know...
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Degrees of Separation
Latest Posts
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RE: How Accurate Is My DIY Heat Loss Calculation?
@editor Thanks Mars, I have been enjoying playing with ...
By kilgorexv , 6 hours ago
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New Vaillant Arotherm controls link to existing thermostats ; wired vs wireless
I am feeling baffled and worried:We are having a an Aro...
By GutoFfowc , 8 hours ago
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RE: Do I add Air Con or MVHR to existing A2W ASHP?
@rob-of-york Thank you, I’m thinking along these same l...
By Toodles , 11 hours ago
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@Mars Good questions! The downstairs unit did the maj...
By Rob of York , 11 hours ago
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RE: Questions about A2A for heating as well as cooling
@donciccio I would suggest that you take a "fabric-fi...
By Rob of York , 12 hours ago
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RE: Volumisers in Heat Pump Systems: Does Placement Matter?
@dave, I think @jamespa has probably identified the mos...
By Mars , 1 day ago
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RE: Plug and play solar. Thoughts?
My thought is simple. Bring it on and bring on plug in...
By JamesPa , 2 days ago
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RE: Heat Geek mini store vs pump size
Yes I agree, that’s why Heat Geek have most likely sele...
By Tomtheheatingengineer , 2 days ago
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RE: Who's your electricity provider and what's your tariff?
@chandykris Swings and Roundabouts, you win some…. ...
By Toodles , 2 days ago
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@tomtheheatingengineer, thank you, and welcome to the f...
By Mars , 3 days ago
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RE: HeatGeek vs Octopus surveys: puzzling disparity - any ideas why?
@majordennisbloodnok @tomtheheatingengineer For my ...
By JamesPa , 3 days ago
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RE: Is the "divide by 2900" rule still valid?
Really flow rate is a pipework limitation not a water p...
By JamesPa , 3 days ago
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RE: The good, the bad and the not that great – my heat pump installation
@burtis, I’ve followed this thread pretty much from the...
By Mars , 6 days ago
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