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RadWhisperer
@radwhisperer
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Joined: Oct 19, 2025
Last seen: Dec 20, 2025
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Topics: 0 / Replies: 29
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RE: Advice on internal circulation pump noise

Three things that caused noise in my system after commissioning. Volumiser was gurgling which just turned out to be the air bleed valve not open. ...

3 days ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Defrost behaviours

@georgea You system isn't too different from mine. I don't have UFH and my house is a 2 bed mid-terrace so maybe a bit smaller. Heat loss 3.3 @ -3C...

3 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Defrost behaviours

Slight correct to the above defrost behaviour as the fan only ramps at the beginning and end of the cycle. The bit in the middle is when both the wate...

4 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Defrost behaviours

ASHP Model: Daikin Altherma 3M 4KW House loss: Calculated 3.3 at -3C, definitely overestimated though. Control mode: Weather Comp + Thermostat wit...

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

With existing rads it seems easier to just install A2W. I've seen some larger houses with multiple internal A2A units have pipework running all over t...

4 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Maintaining temperature on windy day

Valiant & Daikin have a form of load compensation or room influence which can dynamically adjust the WDC by a few degrees based on what thermostat...

4 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Extend the colder range of the weather compensation curve?

Daikin has a slope WDC which changes per degree of temp change I think. Never used that one myself. The more commonly used one has the two points at e...

4 weeks ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Confused by Flow Rates

I was thinking something similar to the OP half way through the episode still worth a watch of course. Emitter type, delta-T & WDC steepness are...

1 month ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Daikin Short Cycle Query

Just a suggestion but upload your images to an AI agent such as Grok with a full description of your installation and you will get a good description ...

1 month ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Daikin Wireless Thermostat

The switch from WDC to LWT i.e. pure WC is fairly straight forward. Your current WDC will apply to the LWT mode except now your thermostat is a read o...

1 month ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is it mad to think there should be a minimum SCOP for UK heat pump installs?

Or a minimum standard for data collection. The Daikin MMI gives unusable graphs on the tiny MMI interface. There are sums for input and output on diff...

2 months ago
Forum
Government Schemes, Regulations, Training, Planning & Organisations
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RE: Daikin Octopus installation update - I saw my first defrost. 😍😂

My MMI is in the loft but I checked the pump flow rate when running the DHW cycle and it was 25 l/h and I could hardly tell it was running. So now I k...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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