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Derek M
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Derek M
@derek-m
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Illustrious Member
Joined: Mar 4, 2021
Last seen: Sep 19, 2024
Profile Activity
Topics: 7 / Replies: 4405
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RE: Altherma 3 4kw - Overshoot

During this cold weather I suspect the cycling will invariably be due to the heat pump defrosting. This is perfectly normal, and whilst undesirable, i...

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

Setting the WC curve at 50C LWT @ 0C OAT, could produce the same slope as 55C LWT @ -5C OAT, the difference being that in the first instance the LWT w...

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

The WC curve needs to match the heat loss of your home, so if you find that your home is not achieving the desired temperature with the curve set at s...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Altherma 3 4kw - Overshoot

All forms of heating systems are going to have to work harder and use more energy when the weather is cold. Because heat pumps get most of there ene...

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

To help with your understanding. The LWT dictates how much thermal energy it will be possible for the heat emitters to emit. If your radiators or UF...

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

Theory would suggest fewer defrost cycles at OAT's below -3C. Where do you live and do you suffer high humidity levels?

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Do setbacks save energy without compromising comfort?

I would suspect that it would be very difficult if not impossible to fully explain the difference without looking closely at the underlying raw data, ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Solar battery size- advice please!

I don't disagree with what you are saying, but when I talk about large scale energy storage, I am thinking more along the lines of GWh size systems, w...

2 years ago
Forum
Energy Storage
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RE: Icy cold weather, weather compensation and consumption

You are in the fortunate position of having an Ecodan and a well insulated home. Looking at the manufacturer's data tables, a 14kW Ecodan should sti...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Icy cold weather, weather compensation and consumption

Thank you Dunlorn, you appear to have answered the question I was going to pose to forum members. "Does the defrost frequency reduce at OAT's below -3...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Really weird behaviour, random heat spikes with Heatmiser!

There appears to be some confusion. My post was a reply to the question set by Andehh, who appears to experiencing spikes in temperature as shown in t...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Altherma 3 4kw - Overshoot

The problems you are experiencing are because you have an on - off type room thermostat controlling how the heat pump operates. If you wish to have th...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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