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2 bedroom bungalow with a Daikin ASHP

RE: 2 bedroom bungalow with a Daikin ASHP

LittleRed · 2021-11-28T23:23:10Z

Hi, just moved into a brand new 2 bedroom bungalow with a Daikin ASHP and am shocked at how expensive it has been costing so far. We have been in a month and today we used £12.50 in a single day and were not even warm. Each room is thermostatically controlled and it is all under floor. We do not know what temperature it is best to turn it all down to overnight or if we need to keep it a set temperature all the time so any advice appreciated. We are with Eon and the tariff is 21p per kw and according to moneysavingexpert this is the cheapest rate we can currently get. We have just retired and on a fixed budget so were not expecting such high fuel bills. So just looking for expertise on how best to use it most efficiently please.

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Air Source Heat Pumps (ASHPs)

Last Post by Derek M 4 years ago

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Kev M

(@kev-m)

Noble Member Member

Joined: 5 years ago

Posts: 1276

30/11/2021 7:20 pm

@littlered,

Although the ASHP will be less efficient at night when it's colder, you'll be using most of your electricity on daytime rates simply because daytime rates apply 71% of the time (17/24). You'd have to check Eon's rates but it's unlikely E7 will be cheaper overall because the daytime rate is always more expensive. E7 is really for the likes of those with storage heaters, where 80% or so of the electricity is used at night.

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Derek M

(@derek-m)

Illustrious Member Member

Joined: 5 years ago

Posts: 4425

30/11/2021 7:30 pm

@littlered

As a rough estimate, based on the size of your property and the type of system that you have, you are probably using 2 to 3 times the amount of energy than you should be.

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LittleRed

(@littlered)

Eminent Member Member

Joined: 4 years ago

Posts: 37

Topic starter 30/11/2021 7:33 pm

@derek-m Pleased to say after some adjustments we were down to £3.60 today. Phew. Power cut and snow added to the surge in energy use it seems.

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LittleRed

(@littlered)

Eminent Member Member

Joined: 4 years ago

Posts: 37

Topic starter 30/11/2021 7:35 pm

@kev-m Well, they kept transferring me from dept to dept and would not tell me the actual day time rate until I signed up for a dual meter, so I gave up on them and came to the same conclusion about economy 7. Thanks for confirming the detail though.

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Derek M

(@derek-m)

Illustrious Member Member

Joined: 5 years ago

Posts: 4425

30/11/2021 7:39 pm

Posted by: @littlered

@derek-m Pleased to say after some adjustments we were down to £3.60 today. Phew. Power cut and snow added to the surge in energy use it seems.

You will probably discover that the reduction in energy use is due to the fact that it is much warmer today.

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batalto

(@batalto)

Noble Member Member

Joined: 5 years ago

Posts: 1092

30/11/2021 7:43 pm

@derek-m absolutely. I've used 1/4 today of what I used yesterday

12kW Midea ASHP - 8.4kw solar - 29kWh batteries
262m2 house in Hampshire
Current weather compensation: 47@-2 and 31@17
My current performance can be found - HERE
Heat pump calculator spreadsheet - HERE

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LittleRed

(@littlered)

Eminent Member Member

Joined: 4 years ago

Posts: 37

Topic starter 30/11/2021 7:45 pm

@derek-m Yep, weather dependent heating system, something you don't really fully understand or appreciate until you get a freezing cold day.

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Derek M

(@derek-m)

Illustrious Member Member

Joined: 5 years ago

Posts: 4425

30/11/2021 7:53 pm

Posted by: @littlered

@derek-m Yep, weather dependent heating system, something you don't really fully understand or appreciate until you get a freezing cold day.

I think that you will find that all heating system are weather dependent, it is just that ASHP's are more weather dependent than the other types.

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LittleRed

(@littlered)

Eminent Member Member

Joined: 4 years ago

Posts: 37

Topic starter 30/11/2021 7:54 pm

@derek-m True

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LittleRed

(@littlered)

Eminent Member Member

Joined: 4 years ago

Posts: 37

Topic starter 04/12/2021 6:57 pm

A neighbour on this new development we had just moved into has told us and other neighbours that he has discovered that our back up system is kicking in all the time which may be what is contributing to our high costs. We are taking this up with the developer. But in the meantime can anyone explain in idiots (me) terms what the back up system is for, how it should be set up and how and if it should be altered if it is coming on? Our neighbour says it is set up to come on at 0 and he thinks it should be at least -5-10?

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Derek M

(@derek-m)

Illustrious Member Member

Joined: 5 years ago

Posts: 4425

05/12/2021 2:33 pm

Posted by: @littlered

A neighbour on this new development we had just moved into has told us and other neighbours that he has discovered that our back up system is kicking in all the time which may be what is contributing to our high costs. We are taking this up with the developer. But in the meantime can anyone explain in idiots (me) terms what the back up system is for, how it should be set up and how and if it should be altered if it is coming on? Our neighbour says it is set up to come on at 0 and he thinks it should be at least -5-10?

Hi LittleRed,

Some, but not all systems, may have a backup heater installed. As the name suggests, it is to backup the ASHP, when the heat pump can no longer supply enough heat energy to meet the heat demand. If your ASHP is correctly sized and installed, it should be capable of meeting the heat demand down to ambient air temperatures of -5C or even lower, so in normal operation the backup heater should only be required 'once a blue moon'.

If the backup heater is operating frequently, then it would indicate that there are problems with your system that need to be investigated.

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LittleRed

(@littlered)

Eminent Member Member

Joined: 4 years ago

Posts: 37

Topic starter 05/12/2021 2:54 pm

@derek-m Thanks to our neighbour who has been monitoring this for a few months, we think that is where the problem lies, as he said exactly what you said in this post. Trying to get the developer to come and change the settings is the issue and currently if we change them we jeopardise the warranty. Will keep you posted, but we are all hopeful that this is the cause of our excess costs.

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