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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Sep 22, 2025
Profile Activity
Topics: 17 / Replies: 2890
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RE: What do we need to know before installing a heat pump?

According to the databook the minimum output of the Midea unit at LWT55 OAT 7C is 9kW. So its cycling much of the time even if the 12.6kW calculated ...

2 years ago
Forum
Government Schemes, Regulations, Planning & Organisations
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RE: What do we need to know before installing a heat pump?

Its easily done, I had to edit my response to get everything right. Yes if you have 12kW heat loss at -2 then you will need to inject 12kWh into the ...

2 years ago
Forum
Government Schemes, Regulations, Planning & Organisations
Reply
RE: What do we need to know before installing a heat pump?

Its easily done, I had to edit my response to get everything right. Yes if you have 12kW heat loss at -2 then you will need to inject 12kWh into the ...

2 years ago
Forum
Government Schemes, Regulations, Planning & Organisations
Reply
RE: What do we need to know before installing a heat pump?

I assume that the vertical axis is kWh/week (ie energy consumed/delivered in any one week), consistent with the title, can you confirm. If so oil pea...

2 years ago
Forum
Government Schemes, Regulations, Planning & Organisations
Reply
RE: What do we need to know before installing a heat pump?

As I said it depends on what you are trying to calculate. If you are trying to calculate heating load (ie what the house needs) then degree-days are ...

2 years ago
Forum
Government Schemes, Regulations, Planning & Organisations
Reply
RE: What do we need to know before installing a heat pump?

Be careful not to confuse kW (power) and kWh (energy). 12.3kW is the (calculated) peak power demand at the design temperature. To get to kWh/year yo...

2 years ago
Forum
Government Schemes, Regulations, Planning & Organisations
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RE: What do we need to know before installing a heat pump?

@cathoderay Thanks The first observation I would make is this: 1100l oil per year is 11.4MWh. Even if your oil is 100% efficient that would sug...

2 years ago
Forum
Government Schemes, Regulations, Planning & Organisations
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RE: What do we need to know before installing a heat pump?

@derek-m Surely that depends on what you are trying to calculate. Degree days will tell you about demand (load) profile whatever the heating technolo...

2 years ago
Forum
Government Schemes, Regulations, Planning & Organisations
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RE: What do we need to know before installing a heat pump?

It deserves an explanation if collectively we can find one. You seem to have done many of the obvious things right, and it would be instructive to fi...

2 years ago
Forum
Government Schemes, Regulations, Planning & Organisations
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RE: What do we need to know before installing a heat pump?

I havent found a source of hourly data over an extended period of time which is available for free (you can get about a months worth at a time here:/p...

2 years ago
Forum
Government Schemes, Regulations, Planning & Organisations
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RE: What do we need to know before installing a heat pump?

My answers in short to the questions asked (I can provide more detail on request): 1. No, I would trust this and other forums. Government/Industry ...

2 years ago
Forum
Government Schemes, Regulations, Planning & Organisations
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RE: What do we need to know before installing a heat pump?

If that is the case (which I can, sadly, easily believe) then its very badly set up indeed. The energy used should be about one third. Running costs...

2 years ago
Forum
Government Schemes, Regulations, Planning & Organisations
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