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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: Accelerating the transition to heat pumps

@mike-patrick Is the 10,500kWh usage just for the heat pump, or for your whole house? To give a meaningful comparison it would need to be just the p...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Vaillant Arotherm Plus problem

@witchcraft You can always download the manuals, which is what I do. Just make certain that you have the correct one for your model. The installer...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Vaillant Arotherm Plus problem

Tut Tut Editor, are you saying that the forum members are not competent? 🤣 As I have been advising Junior Engineers for many years, 'If all else fa...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Vaillant Arotherm Plus problem

Looking at the manual it would appear that F.788 is in relation to the water pump external to the heat pump unit. Try carrying out the checks detailed...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Mitsubishi 8kW - strange energy use readings

@gfletcher I forgot that you mentioned that you have solar PV. Applying Kirchhoff's First Law, which states that the sum of the currents flowing i...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Mitsubishi 8kW - strange energy use readings

@gfletcher It will probably be measuring the electrical current flowing into the unit along with the supply voltage, and thereby calculating the pow...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Mitsubishi 8kW - strange energy use readings

@gfletcher 3kWh/day equates to 125W/hour, which isn't a great deal in the scheme of things, but of course adds up over time. If possible check the r...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Most efficient use of NIBE GSHP with Solar PV

@bob-grumble We still have a diesel, though don't do a vast amount of mileage. I haven't researched it, but I think that you will be okay with 10k...

3 years ago
Forum
Grounds Source Heat Pump (GSHPs)
Reply
RE: Most efficient use of NIBE GSHP with Solar PV

Hi Bob, Welcome to the forum and I am pleased to hear that you are very pleased with your Nibe heat pump. It is always difficult giving definitive...

3 years ago
Forum
Grounds Source Heat Pump (GSHPs)
Reply
RE: Weather compensation and air source heat pumps

@editor Apparently our present government don't think that it is important for people to reduce their energy consumption, just to use it at a differ...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: High air source heat pump running costs – Vaillant AroTherm Plus

It should be possible to roughly calculate the effect if you know the concentration of glycol. Glycol has a lower specific heat capacity than water,...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: High air source heat pump running costs – Vaillant AroTherm Plus

Hi Colin, Are you certain that you actually have dump valves installed? If so, where will they actually dump the water and glycol mixture should the...

3 years ago
Forum
Air Source Heat Pumps (ASHPs)
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