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JamesPa
@jamespa
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Joined: Apr 3, 2023
Last seen: Aug 17, 2025
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Topics: 17 / Replies: 2695
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RE: Ideal Logic ASHP - change from 55°C to 35°C Heating?

Ok on second thoughts scrub the questions. Id be tempted to optimise the rads as previously described. If you find that this results in a rad curve ...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Ideal Logic ASHP - change from 55°C to 35°C Heating?

Ok. When you say max 50 what changes it? Does it in practice run at 50 and if so does the zone valve switch it on and off? Basically I'm trying to...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Ecodan - is there actually such a thing as a 'minimum' flow temp to avoid cycling, and why if so?

@rhh2348 have you got graphs to illustrate this, if so can you post them please (or were you sitting and watching?)

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Ideal Logic ASHP - change from 55°C to 35°C Heating?

@tomdad How is it all connected/controlled. The heat pump can only produce water at one temperature at any one time, so either it's all running at...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Bathroom Radiator replacement

Yes. Just find any radiator catalogue eg myson or stelrad and look it up. This will give you W at a DT of 50C between flow temp and room. To conver...

4 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
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RE: Ecodan - is there actually such a thing as a 'minimum' flow temp to avoid cycling, and why if so?

The radiator output at any given ft will increase if the radiator is larger. So larger rads will translate to lower ft (for the same house temperatur...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Ideal Logic ASHP - change from 55°C to 35°C Heating?

@tomdad Here is some more detail. Firstly your heat pump is capable of operating at 55 or 35 or anywhere in between and indeed for a bit either si...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Bathroom Radiator replacement

Thats the main consideration. You need to calculate btu or kW at your design flow temperature and compare with the room heat loss. Towel rails emit...

4 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: Ecodan - is there actually such a thing as a 'minimum' flow temp to avoid cycling, and why if so?

The point to understand is that cycling basically occurs because the heat demand from the house is less than the minimum that the compressor can produ...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Ideal Logic ASHP - change from 55°C to 35°C Heating?

That's a bit of a red flag. I don't think your WC settings are correct. No panic because the heating season is more or less over but some tweaks dur...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Ideal Logic ASHP - change from 55°C to 35°C Heating?

A couple of things: 1. You should be running on weather compensation (WC) so that the FT reduces as the outdoor temp increases. Your installer shou...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Questions on my Hitachi Yutaki SCombi Heat Pump

OK, thats good and low. With low flow temperatures like this there is less to be gained by operating weather compensation than if you were operating ...

4 months ago
Forum
Air Source Heat Pumps (ASHPs)
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