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iancalderbank
@iancalderbank
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Noble Member
Joined: Oct 17, 2022
Last seen: Jan 14, 2025
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Topics: 0 / Replies: 643
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RE: Performance in the current cold snap…

this needs qualifying. The "install a system that won't get any complaints or callbacks but we don't care about efficiency" approach installs an LL...

1 year ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Heat pump size advice – is 16kW overkill for this property?

@bontwoody no (as per previous post) I optimise for lowest cost at "decent but not best" efficiency by doing 1 full reheat a day, during the night. Bu...

1 year ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Heat pump size advice – is 16kW overkill for this property?

@bontwoody if you''re on a cheap night tariff the cheapest time to fully heat DHW is at night (less efficient but costs less). If no cheap tariff then...

1 year ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Secondary pump speed - how much slower should it be?

the smallest amount slower that you can reliably engineer. The thing you are trying to tune out is mixing of hot and cold flows within the LLH, which ...

1 year ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Heat pump size advice – is 16kW overkill for this property?

kudos to yourself for helping your neighbour this way. on DHW, I do the exact opposite of what your chap said. I let the cylinder get as cold as I c...

1 year ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Ecodan 11.2kW with low 5 litre per minute flow rate leading to L9 error

@paulrlondon did they flush the system round after the last piece of major radiator / pipework? good practice would be to push a load of water through...

1 year ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Performance in the current cold snap…

@cathoderay flow rate tweak - yes my bad, I had it in my head we were balancing flow rates with an LLH. It hadn't occurred to me that it wouldn't make...

1 year ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Performance in the current cold snap…

@cathoderay I thought a bit more about the flow rates thing. with a Buffer / LLH it matters to get them balanced, as that minimises the effect of mixi...

1 year ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Grant 13kW Aerona3 - issues getting zones to temp

@crimson the only places for TRV's in an ASHP system are a) a room with large solar gain b) bedrooms, you may want them to run cooler than the rest o...

1 year ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Grant 13kW Aerona3 - issues getting zones to temp

@crimson one little known fact , particularly by "ex gas fitter" plumbers, is that zone valves themselves slow the flow down. A "typical boiler style"...

1 year ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Updates and announcements

I'm not sure if its me and I'm going mad, but the "preview" button at the bottom of the compose box seems to have disappeared since the move to the ne...

1 year ago
Forum
Introductions, Forum Rules & Updates
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RE: 12kW Samsung ASHP set up help needed

<spits blood> even grahamh the man who was freedom, advocates bufferless now. oh B411s, thanks, missed that. In that case @swanny we need t...

1 year ago
Forum
Air Source Heat Pumps (ASHPs)
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