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Last seen: Mar 20, 2026
@transparent Thanks, this is extremely helpful, especially the explanation about NHBC pre‑registration and older SAP/Building Regs potentially being ...
@johnnyb Thanks for all of that is really helpful context. I agree that if the house can’t get above 16°C in cold weather with a 7 kW unit, ...
@jamespa Thanks for the detailed thoughts, that all makes sense. I’m going down the formal route for now, but I’m trying to understand the system bet...
@jamespa Thanks, That’s really useful. I’ve got the Daikin MMI controller and will increase the WC curve to 55°C @ -3°C on the next cold spell. I’l...
@deltona I have raised it with their resolution service
@cathoderay I’m going down the formal route rather than trying to redesign the system myself. The house is too cold, it can’t reliably reach 21°C, an...
@transparent Thanks for the information — yes, this is definitely of interest. Just to give you a quick overview of where things currently stand with...
@jamespa Thanks for the detailed questions — here’s the extra information that might help clarify the situation. We don’t have any of the formal de...
@cathoderay Thanks, yes, it’s definitely a red flag that the developer won’t release the heat‑loss calculations or any of the design data. I’ll giv...
@cathoderay I don’t have an accurate heat‑loss figure yet because the housebuilder hasn’t provided any of the required design data (SAP, BREL, U‑valu...
@jamespa Thanks again for your help — here’s a clearer and more detailed breakdown of the situation, including the temperatures we’re seeing when the...
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Latest Posts
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RE: Adding additional Solar Panels to a DC coupled battery system
@old_scientist I got them from Tradesparky. In the end ...
By bontwoody , 1 hour ago
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RE: How Accurate Is My DIY Heat Loss Calculation?
@kilgorexv definitely a larger inverter will help and m...
By AndrewJ , 18 hours ago
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RE: Adventures in heat loss calculations
@rob-of-york — thanks for posting this, all very useful...
By cathodeRay , 21 hours ago
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RE: Surface mount or bury primaries for heat pump installation?
The installation is almost done! I've written up two ...
By tomasmcguinness , 1 day ago
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RE: Glass lined Cylinder for private water supply
This has turned into a fascinating little rabbit hole. ...
By Mars , 2 days ago
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RE: Switch suitable to change between two inverter CT's
Last winter my battery ,32KWh, could run the house com...
By Jancold , 2 days ago
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RE: HeatGeek vs Octopus surveys: puzzling disparity - any ideas why?
Agree with Major. And even if I was very happy with ...
By Batpred , 2 days ago
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RE: Is the "divide by 2900" rule still valid?
There is another estimator that you could use, a formul...
By Rob of York , 2 days ago
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RE: To re-pipe or not to re-pipe? Moving from oil boiler to air source heat pump.
@penval, really useful update. After all the discussion...
By Mars , 4 days ago
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RE: Who's your electricity provider and what's your tariff?
@papahuhu I prefer to look at it simplistically. We d...
By Old_Scientist , 5 days ago
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RE: Questions about A2A for heating as well as cooling
@rob-of-york I would concur with the underfloor insulat...
By Toodles , 5 days ago
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RE: New Vaillant Arotherm controls link to existing thermostats ; wired vs wireless
Nothing attached! I have rads but UFH makes the case ...
By JamesPa , 5 days ago
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RE: Cooling with air to water heat pumps
Passive cooling should always be the first call. Keep ...
By JamesPa , 5 days 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 , 6 days ago
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