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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Sep 12, 2025
Profile Activity
Topics: 17 / Replies: 2837
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RE: Vaillant Arotherm ASHP gets noisier when it gets colder outside

@judith Thanks for posting these, I have skip read both and intend to read them fully. They both look to be interesting and have some useful insight.

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Mitsubishi Ecodan 8.5kW Monobloc (FTC5) Defrost Mode

Perhaps. My 200 sw m 1930s retrofit with fabric upgrades of various quality at various times has a measured loss (from gas consumption) of 7-7.5kW. ...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: What to Expect During Your First Winter with a Heat Pump

Just to put the other, more positive side of this argument, I have now had my heat pump for just over a month and, because the temperature has been al...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Mitsubishi Ecodan 8.5kW Monobloc (FTC5) Defrost Mode

Well in fairness it's his job! No need to answer the questions btw, you could as you say just leave it to the installer.

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Mitsubishi Ecodan 8.5kW Monobloc (FTC5) Defrost Mode

Worth measuring, some ashps have a temperature offset setting which could be fooling the app. Also worth measuring the other two ports on the llh. ...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Controversial opinions - pure weather compensation, buffer tank, heat loss, oversized heat pumps

I realise that maybe the case for your customers now but the statement that bigger is better (and more importantly that you don't have to change the f...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Mitsubishi Ecodan 8.5kW Monobloc (FTC5) Defrost Mode

How well balanced is the LLH . Unless perfectly balanced they have the potential to cost 15% or more in efficiency and 5C in flow temperature. If y...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Mitsubishi Ecodan 8.5kW Monobloc (FTC5) Defrost Mode

Have you got a buffer tank with 3 or 4 ports? Do you know what temp the flow gets down to during defrost?

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Mitsubishi Ecodan 8.5kW Monobloc (FTC5) Defrost Mode

@davidnolan22 Couple of questions/ideas Are you operating any kind of noise reduction mode Have you got all rads permanently on, no trvs ...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Mitsubishi Ecodan 8.5kW Monobloc (FTC5) Defrost Mode

@gary Thats really interesting. My Vaillant takes (I think) a different approach and whacks the compressor up to 100% modulation immediately after...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Mitsubishi Ecodan 8.5kW Monobloc (FTC5) Defrost Mode

Have you got any plots from melcloud showing how it works during recovery from defrost. I have heard an argument that, if you have lots of fancoils,...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Mitsubishi Ecodan 8.5kW Monobloc (FTC5) Defrost Mode

I would be careful with that presumption. Minimum volume is at least in significant part about defrost, and what matters is the minimum volume availa...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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