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JamesPa
@jamespa
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Joined: Apr 3, 2023
Last seen: Jan 14, 2026
Profile Activity
Topics: 20 / Replies: 3933
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RE: Confused by Flow Rates

Cycling will always occur if the demand from the house (essentially the heat loss at the current OAT) is less than the minimum steady state output of ...

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

Only to the same extent that outside temperature, or room temperature 'controls' dT. Its certainly true to say that dT may vary as a result of changi...

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

Heat pumps cant do the first directly because its not something they directly control. DT is determined by the loss from the emitters (which is in tu...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Maximising Home Automation: Integrating Octopus Energy & More

I thought I has answered this; I think the answer is NO because of the bits in italics.    

2 months ago
Forum
Your Home
Reply
RE: Grant 13kW Aerona3 - issues getting zones to temp

This problem occurs, to a greater or lesser extent, with any heating system really whether ASHP. Oil or Gas and isnt special to Grant in the ASHP worl...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Maximising Home Automation: Integrating Octopus Energy & More

Ah, this is a bit of a mess. The interface from the smart meter to HA depends on the HID (home interface device - the little display you get). Some ...

2 months ago
Forum
Your Home
Reply
RE: Grant 13kW Aerona3 - issues getting zones to temp

The Samsung app is pretty user friendly, but has some limitations in its capabilities unfortunately. At installer show the Samsung rep proudly showed...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Mixture of copper and plastic CH pipework. Will it be ok, or need changing?

In principle yes. Some heat pumps (I think including Daikin) appear to modulate the water pump to achieve a quasi fixed DT. So if you set it at 6 fo...

2 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: Grant 13kW Aerona3 - issues getting zones to temp

That all sounds promising, the right people, who hopefully understand what they are looking at, are finally on the case. Just one thought, if you are...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Mixture of copper and plastic CH pipework. Will it be ok, or need changing?

According to the Heat Geek cheat pipe sizing sheet (which seems to have disappeared form the heat geek site but is reproduced here 22mm copper is good...

2 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: Extend the colder range of the weather compensation curve?

No issues at all in extending it so far as I can see, certainly until the point where you are asking it to exceed it's max flow temperature Obvio...

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Installer Fitted 9kW Instead of 11kW Heat Pump and Changed MCS Paperwork - What do I do?

So here is the basic spec sheet showing SCOPs. In an 'average climate' - is I think an EU definition) SCOP is quoted at 3.39 at 55FT and 4.72 @ 35FT....

2 months ago
Forum
Air Source Heat Pumps (ASHPs)
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