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AllyFish
@allyfish
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Joined: Oct 31, 2022
Last seen: May 19, 2025
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Topics: 22 / Replies: 465
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RE: ASHP + UFH, no circulation pump

@pie_eater different manufacturers have differing accuracies of COP data, some are just considering the refrigeration compressor, some are total unit ...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: ASHP + UFH, no circulation pump

Beware the OEM COP 'vanity data' - most if not all heat pump controllers give very flattering [for flattering read exaggerated] COP data. True measure...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Bad COP? Long Pipe Run on Cosy6 Saga Continues.

With the ASHP installed in a neighbouring street it's going to struggle with heat loss & hydraulic resistance. Clearly no-one had done any proper ...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is the Grant controller a thermostat?

Hi there @bajj, you've cracked it I think with setting parameter 21 41 to 2degC. UFH will have a very slow hysteresis response as the mass of the floo...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Grant Aerona Cutting Out. Hot Water fine.

This is strange @martyj76, if the unit was installed by a Grant G1 installer, and has been annually serviced by a Grant G1 service engineer, it will b...

6 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Who's your electricity provider and what's your tariff?

E.ON has launched their Cosy Octopus copy tariff product, 'E.ON Next Pumped' with 2x3hr low rate periods, 4am-7am & 1pm-4pm, just like the origina...

6 months ago
Forum
Electricity, Tariffs, Monitoring & Providers
Reply
RE: How to make me regret installing a heat pump

@wanttobegreen sure, 2x6.5kW. Which gives a useable storage capacity of about 12kW. For the majority of the winter we can charge 9kW into the batterie...

6 months ago
Forum
Government Schemes, Regulations, Planning & Organisations
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RE: Oh Dear NESTA!

Andy's assertion that anyone with batteries can power their home in a storm [implying they can draw from the batteries when the grid is out] betrays h...

6 months ago
Forum
Government Schemes, Regulations, Planning & Organisations
Reply
RE: How to make me regret installing a heat pump

@wanttobegreen as per Toodles' advice. The Solar PV batteries in winter coupled with Cosy electricity tariff are a game changer. 85% of our electricit...

6 months ago
Forum
Government Schemes, Regulations, Planning & Organisations
Reply
RE: ASHP + UFH, no circulation pump

Some Daikin systems use PWM speed controlled pumps, I'm not that familiar with them, so the total system heating flow rate may vary according to heat ...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: ASHP + UFH, no circulation pump

Hi there @pie_eater, absolutely right to try it single zone 'open loop' first, and see if it's a success. Buy or borrow an infrared thermometer or, ...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Grant 13kW Aerona3 - issues getting zones to temp

Yup, must be the R32 model. The larger R290s are not available wholesale yet.../p> Trying to find out who the Chinese OEM is of the Grant badged R29...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
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