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Scalextrix
@scalextrix
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Joined: Sep 26, 2024
Last seen: Dec 5, 2025
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Topics: 6 / Replies: 114
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RE: Simulation of ASHP with Gas boiler as part of decision process

The current boiler has a single 22mm pipe, but as you suggest that splits into a 22mm feed for upstairs and a 22mm feed for downstairs. That split oc...

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

Exactly, they said 8kW for us, I need to try and see if that's legit. I think it probably is, but it's getting that emitted into the places we need i...

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

This is exactly why I'm trying to do a real world test simulation. Our 1960s house has construction of different types in different places and it's i...

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

Yeah, this isn't roof or wall insulation, bit hard to explain. Imagine the joists that separate the ground floor ceiling from the upper storey floor, ...

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

Yeah I tried running 24/7 last year and it was very expensive, seemed to use a lot more gas, probably because we have no weather compared, causing sho...

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

It was installed 18 years ago, plumber just used his thumb-ruler, not calculations. Though back then the house had draughts under doors, poor windows...

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

@johnmo understand, but I don't have a heat pump yet or weather compensation, all I can do is hard set flow rate to 50C. If there is a better way to...

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

@cathoderay in fact I think most of our current radiators are oversized for 70C flow. Most of the house was actually acceptable last winter at 50C flo...

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

@johnmo we could but I think they look a bit ugly

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

We tried the retrofit fans that stick with magnets to the rads a few years ago just for fun. While they were silent before putting on the rad, once t...

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

@jamespa thanks for the reply, we tried this last year and we couldn't keep the living room to the tropical temperature required, which actually led m...

1 year ago
Forum
Air Source Heat Pumps (ASHPs)
Topic
Simulation of ASHP with Gas boiler as part of decision process
1 year ago
Forum
Air Source Heat Pumps (ASHPs)
Replies: 136
Views: 17336
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