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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Dec 17, 2025
Profile Activity
Topics: 19 / Replies: 3693
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RE: Replacing my 18 month old Hitachi Yutaki ASHP

It will be good then to see some plots tomorrow morning to compare! I'm beginning to wonder from your description if it's delaying starting defrost...

2 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: A2A vs A2W: Which Heat Pump Would You Pick?

I have one fancoil in an otherwise all radiator system. I am working on adding diy fan assistance to another radiator. The latter is for cooling onl...

2 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Replacing my 18 month old Hitachi Yutaki ASHP

I can't comment on the defrost algorithm or numbers. If the heat pump is not recovering temperature after defrost, I would turn off night shift. Be...

2 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: How good is the app support for your heat pump?

I would describe the Vaillant app as pretty reasonable-good. You can change set temperature (which actually shifts the WC curve), change the wc curve...

2 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Electricity price predictions

I apologise if I have contributed to that, it certainly was not my intention.

2 weeks ago
Forum
Electricity, Tariffs, Monitoring & Providers
Reply
RE: Replacing my 18 month old Hitachi Yutaki ASHP

No. Obviously it cant do anything at all when there is a power cut! Otherwise I would hope it prioritizes defrost over absolutely everything else...

2 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Electricity price predictions

So you make it in the West Country and transport it elsewhere for applications that can stand the cost, which some can becasue the alternatives are as...

2 weeks ago
Forum
Electricity, Tariffs, Monitoring & Providers
Reply
RE: Electricity price predictions

In fairness we did something like that in the 1970s when we moved from coal gas to North Sea gas. I have hear it said that, because hydrogen is so s...

2 weeks ago
Forum
Electricity, Tariffs, Monitoring & Providers
Reply
RE: Replacing my 18 month old Hitachi Yutaki ASHP

Congratulations. I know myself how nerve racking it is the first time you take the top off of something like this. I added the 'cooling coding plu...

2 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: One Year Review: Grant 13kW ASHP - A Catalogue of Errors

@solenoid Its probably worth adding that, done well, going through this process is likely to offer a noticeable improvement in comfort relative to sy...

2 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Electricity price predictions

Which is the sort of thing that scares me. How can this ever be sensible/cost effective by comparison to fitting heat pumps, for the reasons set out ...

2 weeks ago
Forum
Electricity, Tariffs, Monitoring & Providers
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