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AllyFish
@allyfish
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Noble Member
Joined: Oct 31, 2022
Last seen: Sep 10, 2025
Profile Activity
Topics: 23 / Replies: 471
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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...

8 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...

8 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...

8 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...

9 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...

9 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...

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Difficult positioning of air source heat pump

Good update 🙂 Cosy 6 aka 'The Maddy D's Bin' has a inclined fan outlet, but the fan outlet is not a freezing risk anyway, that risk is only from cond...

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Does turning down radiators preserve the heat in the water?

South facing rooms with large windows can experience high solar gain. Is this the case? Solar gain is one factor that external weather compensated con...

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Difficult positioning of air source heat pump

Hi @rikiarn, welcome here! Difficult one. A picture says 1000 words. There's some things jump out: The proximity of the neighbouring property. Posit...

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: What’s your ASHP delta T?

Around 5.5degK at design output. Narrows to about 2.4degK on WC low load. Constant flow system so variable deltaT.

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Samsung heat pump has arrived with damaged fins – do I accept it or send it back?

Damage is cosmetic is appears, but the result of poor handling, so there could be inner damage unseen. Send it back. I've noticed an increasing trend ...

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Most treasured kitchen gadget.

The wife (ouch...)

10 months ago
Forum
Well & Truly Off The Grid
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