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Judith
@judith
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Prominent Member
Joined: Nov 28, 2023
Last seen: Jul 7, 2025
Profile Activity
Topics: 2 / Replies: 366
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Reply
RE: Simulation of ASHP with Gas boiler as part of decision process

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 ...

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Simulation of ASHP with Gas boiler as part of decision process

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...

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Simulation of ASHP with Gas boiler as part of decision process

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...

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Simulation of ASHP with Gas boiler as part of decision process

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...

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Low shower pressure after ASHP retrofit

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...

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Heat loss calculations and how they work in conjunction with heat pump sizing

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...

9 months ago
Forum
Safety, Regulations, Tools, Plumbing & DIY Installations
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RE: Choice of heat pump - Help needed - Vaillant Arotherm versus Samsung versus Logic Air versus Grant Aerona

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...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Heat loss calculations and how they work in conjunction with heat pump sizing

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...

10 months ago
Forum
Safety, Regulations, Tools, Plumbing & DIY Installations
Reply
RE: ASHP - a few (probably dumb) questions about the lived experience

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...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Choice of heat pump - Help needed - Vaillant Arotherm versus Samsung versus Logic Air versus Grant Aerona

We’ve just had a Vaillant installed (literally finished today) and the installer (Heatgeek elite) and Vaillant support has been excellent. So personal...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: ASHP - a few (probably dumb) questions about the lived experience

A separate reply about ventilation. The heat loss survey method includes heat loss through ventilation both deliberate and unplanned (otherwise know...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: ASHP - a few (probably dumb) questions about the lived experience

I totally agree with James’ approach of keep the heat pump running continuously during the coldest periods and use set back for overnight lower temper...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
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