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AllyFish
@allyfish
Contributor
Noble Member
4175 kWhs
Joined: Oct 31, 2022
Last seen: Mar 3, 2025
Profile Activity
Topics: 22 / Replies: 455
AllTopicsReplies
Reply
RE: Widespread failure of insulation installation

@jamespa it's seldom adequately understood even by us [so-called] engineering professionals. There was an excellent series of articles published in th...

1 month ago
Forum
Insulation
Reply
RE: Widespread failure of insulation installation

I think there's a sector of the energy efficiency retrofit industry that is well meaning, but simply incompetent. There are two passive retrofit measu...

2 months ago
Forum
Insulation
Reply
RE: Antifreeze corrosive to copper pipe rubber rings?

Hi there, and welcome @wyf. Glycol might not be compatible with all compression fittings that use rubber or neoprene sealing systems. Needs checking. ...

2 months ago
Forum
Safety, Regulations, Tools, Plumbing & DIY Installations
Reply
RE: Insulating brass fittings in Loft

I would insulate them, and any other valves bodies and buffer thank bulkhead fittings, etc. not currently insulated. You can't really over-insulate pi...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Grant Aerona3 R32 HPIDI17 performance in low temperatures

Hello @davidm06, Grant 10kW owner here. We experience the same, the Grant Aerona R32 is a defrost-happy unit, one which will defrost every 40-50 minut...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Vaillant Arotherm ASHP gets noisier when it gets colder outside

@jamespa it's a good find, thank you. Some inaccuracies however, including the assumption that split air source heat pumps have the compressor inside ...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Vaillant Arotherm ASHP gets noisier when it gets colder outside

Our 10kW Grant Aerona also gets noticeably louder when cold. There's a few reasons why: 1. The ASHP is working very hard, the compressor frequency i...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Advice please on optimising Grant Aerona R32 17 kW

Hi @steam-powered, @mikefl makes good points above, especially balancing the low loss header if you have one. If you don't have any flow setting or mo...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Outcome for 2024 - with Agile, ASHP, PV, Batteries, EV

Our 2024 year end summary: 1992 EPC C house (76%) 155m2. 10kW ASHP primary CH & DHW, 5kW wood stove secondary heating for colder winter evening us...

2 months ago
Forum
Electricity, Tariffs, Monitoring & Providers
Reply
RE: MCS heat pump pre-sale information and performance calculation

Rubbish in = rubbish out.EPCs are not reliable with too many assumptions at the discretion of the energy assessor. I downloaded the MCS 031 system p...

3 months ago
Forum
Government Schemes, Regulations, Planning & Organisations
Reply
RE: Raising product standards for space heating

A big 'hmmm' from me. 😉 The elephant in the sitting room is not the efficiency and rated performance of heat pumps when tested to BS EN 14511 or BS...

3 months ago
Forum
Government Schemes, Regulations, Planning & Organisations
Reply
RE: Has anyone replaced an old ASHP with a new one?

Just be mindful of installation restrictions on newer A3 class R290 refrigerant (Propane) ASHP monobloc units. There are rules to follow concerning lo...

3 months ago
Forum
Air Source Heat Pumps (ASHPs)
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