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[Sticky] Say hello and introduce yourself

Mars · 2021-03-02T10:01:30Z

If you're new to the forums, we'd like to take this opportunity to welcome you. Please introduce yourself by telling us a bit about yourself and where you're based.

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Introductions, Forum Rules & Updates

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Majordennisbloodnok

(@majordennisbloodnok)

Famed Member Moderator

Joined: 4 years ago

Posts: 1125

21/10/2025 4:04 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 weeks 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)

Illustrious Member Moderator

Joined: 4 years ago

Posts: 2701

21/10/2025 6:12 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.

Save energy... recycle electrons!

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paultheheating

(@paultheheating)

Eminent Member Member

Joined: 1 week ago

Posts: 10

02/11/2025 11:44 am

im paultheheating am rural landlord and have heating problems

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Transparent

(@transparent)

Illustrious Member Moderator

Joined: 4 years ago

Posts: 2701

02/11/2025 12:03 pm

Hello @paultheheating - I'm a rural Moderator!

What's the heating problem?

In your house or a tenant's?
(We understand that diagnosing issues in a house lived in by a tenant is more difficult as you may not have open access.)

Save energy... recycle electrons!

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