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Majordennisbloodnok
 Majordennisbloodnok
(@majordennisbloodnok)
Famed Member Moderator
Joined: 4 years ago
Posts: 1011
21/10/2025 5:04 pm  

Posted by: @scalextrix
↑

it's a question of the right tool for the right job.

Bog standard house (for it's era) with a few well documented changes = the standard heat loss measurement should be fine. The Elmhurst training does talk about alternatives for more complex scenarios

In a way, @scalextrix, you and @jamespa are talking about different points.

You’re quite right that one needs the right tool for the job. However, even the right tool needs to be used correctly.

Is there anything inherently wrong with the maths behind the heat loss survey process? Not as far as I’m aware. That means it could be one right tool for the job.

Is the heat loss survey “tool” used properly? De facto evidence is “no”; countless customers finding after the fact that their home was given a significantly pessimistic estimate demonstrates this.

How is the tool being used incorrectly? There are two gotchas. Firstly, surveyors make assumptions that have a large material effect on the outcome. That doesn’t mean the model is bad; merely that it can’t work with bad data. Secondly, the outcome - the estimated heat loss - isn’t routinely tested against the real world. Sometimes assumptions have to be made but that’s why you test where you can, and the industry standard is not to verify.

So your assertion is that the heat loss survey is a reasonable model. I agree.

@jamespa’s assertion is that the heat loss survey isn’t used properly. I agree.

It’s not the model that’s flawed; it’s the implementation. And until the survey process includes a bit that says to the surveyor “now cross-check your estimate”, it will remain flawed.

 


This post was modified 3 hours ago by Majordennisbloodnok

105 m2 bungalow in South East England
Mitsubishi Ecodan 8.5 kW air source heat pump
18 x 360W solar panels
1 x 6 kW GroWatt battery and SPH5000 inverter
1 x Myenergi Zappi
1 x VW ID3
Raised beds for home-grown veg and chickens for eggs

"Semper in excretia; sumus solum profundum variat"


   
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Transparent
 Transparent
(@transparent)
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Joined: 4 years ago
Posts: 2632
21/10/2025 7:12 pm  

This discussion has gone quite deep for our Hello & Welcome topic.

If you're new here, and still wondering whether to introduce yourself, then please do so.

There aren't that many problems we haven't been able to resolve one way or another
even if it's just a shoulder to cry on.

KleenexSsm

 


Save energy... recycle electrons!


   
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