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Missing flow temperature in Heat Geek proposal

sttpd1917 · 2026-07-23T18:40:40Z

Hi, I have 3 air source heat pump proposals. 2 of them give a flow temperatures, the Heat Geek one doesn't. I watched the HG video on flow temperature, but that didn't answer my question (or I didn't understand it....) Can someone tell me why HG doesn't give this number? Thanks

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Air Source Heat Pumps (ASHPs)

Last Post by Majordennisbloodnok 50 minutes ago

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Majordennisbloodnok

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09/10/2026 12:26 pm

Posted by: @singlespeed

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If your calculation is actually based on a survey of the property, you should be able to gauge how accurate its going to be, by how much needed to be guesstimated due to hidden features.

...

Not sure I agree entirely with that, @singlespeed.

From all we've seen on this forum, the heat loss survey of most houses appears to involve about the same amount of guesstimating since the number of unknowns usually turns out to be about the same. What varies far more is now close each of the estimates are to reality. For example, almost all surveys will have to estimate the air changes but some will get it close and some will get it wildly wrong. As a result, knowing the air changes are being estimated doesn't give us much of a clue about how accurate the survey will be.

To put it another way, one would expect a survey based on ten estimates to be far less reliable than one only relying on five, but if all of the ten are pretty good guesses and one of the five is way out then we're already in trouble. As has been highlighted in many other threads over the years, I would suggest the only way of gauging how accurate the survey is would be to cross check it with known good historical data like gas consumption figures and so on.

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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