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bontwoody
bontwoody
@bontwoody
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Noble Member
Joined: Mar 5, 2022
Last seen: Jun 20, 2025
Profile Activity
Topics: 28 / Replies: 804
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RE: UFH and ASHPs

@guydeb I'm just in the middle of constructing a 40m2 extention myself and looking at the amount of insulation required now I expect the heat loss to ...

1 month ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: UFH and ASHPs

@guydeb Yes. No problem running just UFH from an ashp. The issue I think would be the very low heat loss in a 40m2 new extension. How sure are you tha...

1 month ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Say hello and introduce yourself

@matwin I believe the degree days calculation is an accurate method of assessing heat pump size. Im not sure how much detail the YouTube video goes i...

1 month ago
Forum
Introductions, Forum Rules & Updates
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RE: Plate heat exchanger considerations

@scalextrix As @JohnMo says though at lower temperatures they need to be bigger so that will probably be the worse performing one in the CH. Also they...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Plate heat exchanger considerations

@scalextrix I cant help with the CH side but you might look at the plate heat exchanger used with a mixergy cylinder to get a handle on the DHW. By al...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Battery sizing - How low can you go!

@chandykris Thats a fair point and something Ive considered. I do keep one eye on ebay for any reduced price battery packs 🙂 Can you post the figu...

2 months ago
Forum
Energy Storage
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RE: Battery sizing - How low can you go!

@chandykris We seem to have similarly sized systems and yes I found Go to be a better choice than cosy with a couple of minor months difference. I r...

2 months ago
Forum
Energy Storage
Reply
RE: What happens when the outside temperature exceeds the upper WC point?

@editor not via the WC curve but as @old_scientist mentioned the setting is in the FSV menu so I was able to set that to 19C rather than it’s default ...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: What happens when the outside temperature exceeds the upper WC point?

@editor Thanks Mars. Interesting talk. I will just point out however I don’t actually run my heat pump at 40C when it’s 17C outside! Don’t know why I ...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Efficiency Concerns on newly installed Mitsubishi Ecodan 8.5kW

@cbrenewable Your COP does appear very low and if you don’t have a buffer that rules out one possible cause. The only thing that stands out as unusual...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: How hard and expensive would it be to change panel and add battery?

@judith that’s interesting as my calculations suggested a smaller battery that didn’t last the day was more cost effective for me. I couldn’t even mak...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: How hard and expensive would it be to change panel and add battery?

Hi. You would probably need to swap the inverter for a hybrid inverter. That would support battery charging. However I would look into the cost v payb...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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