Assuming yours is the same as mine, if you wake up the control panel and press the top right button you should see power delivered and consumed. Pressing it again access HW and heating separately. delivered/consumed =COP. This updates every day then stores the whole month.
Yes it is, all in kWh, my install date was mid Feb 2022, kept the temp turned down until we moved in at the end of March, I can't remember exactly when I changed the DHW from topping up every 5 degree drop, maybe April or May.
Delivered Consumed COP
Nov 22 1443 368 3.9
Dec 22 2200 670 3.3
Jan 23 104 26 4
2022 8949 2670 3.35
That looks good to me. It's a little better than mine (my December is consumed 972 COP 3.03). The caveat is that the numbers from the FTC are estimates but still looking good.
Assuming yours is the same as mine, if you wake up the control panel and press the top right button you should see power delivered and consumed. Pressing it again access HW and heating separately. delivered/consumed =COP. This updates every day then stores the whole month.
Yes it is, all in kWh, my install date was mid Feb 2022, kept the temp turned down until we moved in at the end of March, I can't remember exactly when I changed the DHW from topping up every 5 degree drop, maybe April or May.
Delivered Consumed COP
Nov 22 1443 368 3.9
Dec 22 2200 670 3.3
Jan 23 104 26 4
2022 8949 2670 3.35
Coincidentally ours was commissioned mid-Feb, and we ran it at 16-18C until we moved in early April. Not strictly comparable as ours is new build, but FWIW I'll tabulate the numbers in the format you have used -
Delivered Consumed COP
(FTC6) (HP Meter)
Nov 22 499 250 2.0 (BROKEN DOWN FOR 9 DAYS)
Dec 22 1208 734 1.5
Jan 23 72 33 2.0
2022 4728 2520 1.9
Includes hot water. The power consumed is uncannily close to yours but of course we don't really know how heat loss, ambient temps and commanded temperatures differ.
Our design energy requirements are as shown here - kWh delivered 9627/5822 (heating/DHW) 15449 (Total). kWh consumed 2623/1586, total 4391. The quoted COP is 3.67
We keep the house warm - about 21, with unused rooms (about 1/3 of the heated area) maybe 3 degrees lower.
Initially I queried the COP. Having got through December, I suspect the FTC6 "heat delivered" is the dodgy number as we aren't going to be ridiculously over on the energy consumed. I will try to find out why this delivered estimate is so understated, assuming it is.
My own forecast, based on bills so far and applying seasonality etc is that the HP will use about 4,300kWh. December was about 34% over forecast, maybe not surpising.
Both heating and DHW are 'always on'. Heating is controlled by individual room stats. All heating is UFH, flow temps on curve.
Assuming yours is the same as mine, if you wake up the control panel and press the top right button you should see power delivered and consumed. Pressing it again access HW and heating separately. delivered/consumed =COP. This updates every day then stores the whole month.
Yes it is, all in kWh, my install date was mid Feb 2022, kept the temp turned down until we moved in at the end of March, I can't remember exactly when I changed the DHW from topping up every 5 degree drop, maybe April or May.
Delivered Consumed COP
Nov 22 1443 368 3.9
Dec 22 2200 670 3.3
Jan 23 104 26 4
2022 8949 2670 3.35
Coincidentally ours was commissioned mid-Feb, and we ran it at 16-18C until we moved in early April. Not strictly comparable as ours is new build, but FWIW I'll tabulate the numbers in the format you have used -
Delivered Consumed COP
(FTC6) (HP Meter)
Nov 22 499 250 2.0 (BROKEN DOWN FOR 9 DAYS)
Dec 22 1208 734 1.5
Jan 23 72 33 2.0
2022 4728 2520 1.9
Includes hot water. The power consumed is uncannily close to yours but of course we don't really know how heat loss, ambient temps and commanded temperatures differ.
Our design energy requirements are as shown here - kWh delivered 9627/5822 (heating/DHW) 15449 (Total). kWh consumed 2623/1586, total 4391. The quoted COP is 3.67
We keep the house warm - about 21, with unused rooms (about 1/3 of the heated area) maybe 3 degrees lower.
Initially I queried the COP. Having got through December, I suspect the FTC6 "heat delivered" is the dodgy number as we aren't going to be ridiculously over on the energy consumed. I will try to find out why this delivered estimate is so understated, assuming it is.
My own forecast, based on bills so far and applying seasonality etc is that the HP will use about 4,300kWh. December was about 34% over forecast, maybe not surpising.
Both heating and DHW are 'always on'. Heating is controlled by individual room stats. All heating is UFH, flow temps on curve.
If your system is full UFH, why would you have a design flow temperature of 50C?
When you state that the 'flow temps on curve', do you mean weather compensation?
Assuming yours is the same as mine, if you wake up the control panel and press the top right button you should see power delivered and consumed. Pressing it again access HW and heating separately. delivered/consumed =COP. This updates every day then stores the whole month.
Yes it is, all in kWh, my install date was mid Feb 2022, kept the temp turned down until we moved in at the end of March, I can't remember exactly when I changed the DHW from topping up every 5 degree drop, maybe April or May.
Delivered Consumed COP
Nov 22 1443 368 3.9
Dec 22 2200 670 3.3
Jan 23 104 26 4
2022 8949 2670 3.35
Coincidentally ours was commissioned mid-Feb, and we ran it at 16-18C until we moved in early April. Not strictly comparable as ours is new build, but FWIW I'll tabulate the numbers in the format you have used -
Delivered Consumed COP
(FTC6) (HP Meter)
Nov 22 499 250 2.0 (BROKEN DOWN FOR 9 DAYS)
Dec 22 1208 734 1.5
Jan 23 72 33 2.0
2022 4728 2520 1.9
Includes hot water. The power consumed is uncannily close to yours but of course we don't really know how heat loss, ambient temps and commanded temperatures differ.
Our design energy requirements are as shown here - kWh delivered 9627/5822 (heating/DHW) 15449 (Total). kWh consumed 2623/1586, total 4391. The quoted COP is 3.67
We keep the house warm - about 21, with unused rooms (about 1/3 of the heated area) maybe 3 degrees lower.
Initially I queried the COP. Having got through December, I suspect the FTC6 "heat delivered" is the dodgy number as we aren't going to be ridiculously over on the energy consumed. I will try to find out why this delivered estimate is so understated, assuming it is.
My own forecast, based on bills so far and applying seasonality etc is that the HP will use about 4,300kWh. December was about 34% over forecast, maybe not surpising.
Both heating and DHW are 'always on'. Heating is controlled by individual room stats. All heating is UFH, flow temps on curve.
If your system is full UFH, why would you have a design flow temperature of 50C?
When you state that the 'flow temps on curve', do you mean weather compensation?
I don't know why they have populated that with 50 for heating. It certainly doesn't need to be at 50 and it isn't. Yes it derives flow temp from the compensation/weather curve. Flow temps max out at 40C IIRC and are typically low 30's.
Thank you everyone, is there a way to get daily readings of consumed/delivered in a spreadsheet or easy to transfer to a spreadsheet format? I've had a look in the MELCloud and there are some nice graphs that break it down into DHW and heating but it's difficult to discern absolute values. I'm a bit of a data geek and have made a spreadsheet for my solar and battery and would like to add the HP into the mix.
Thank you everyone, is there a way to get daily readings of consumed/delivered in a spreadsheet or easy to transfer to a spreadsheet format? I've had a look in the MELCloud and there are some nice graphs that break it down into DHW and heating but it's difficult to discern absolute values. I'm a bit of a data geek and have made a spreadsheet for my solar and battery and would like to add the HP into the mix.
I can get a csv file of data from Melcloud but I have the MMSP monitoring. I use this to do analysis and graphs in google sheets or (with a bit of help) in Python.
Thank you Kev, is it only possible to have MMSP if it was done at the time of the RHI application, so I couldn't get it now? I had a google, would you need extra hardware, i.e. another meter? You get paid extra for it?
Thank you Kev, is it only possible to have MMSP if it was done at the time of the RHI application, so I couldn't get it now? I had a google, would you need extra hardware, i.e. another meter? You get paid extra for it?
I get paid extra via RHI; about enough to recover what it cost. You couldn't get it paid for via RHI now. You could pay for the meters (power meter and electricity meter) yourself and I assume (although I don't know for sure, you would have to ask Mitsubishi) you could send the data to Melcloud.
Thank you Kev, is it only possible to have MMSP if it was done at the time of the RHI application, so I couldn't get it now? I had a google, would you need extra hardware, i.e. another meter? You get paid extra for it?
I get paid extra via RHI; about enough to recover what it cost. You couldn't get it paid for via RHI now. You could pay for the meters (power meter and electricity meter) yourself and I assume (although I don't know for sure, you would have to ask Mitsubishi) you could send the data to Melcloud.
Thanks, probably not worth it at this point. I've worked out roughly what I would have spent in Gas using my figures from above 8949 kWh / 0.82 = 10913 kWh @ £0.1024 = £1117 Where 0.82 is the efficiency of the boiler that was taken out given in the HP calculation.
2670 kWh x 0.33 = £881 cost of electricity to run the HP.
Caveats: The cost of electric and gas has not been this high for the full duration, I can't remember the amounts and the dates that they increased. I think that the boiler that we took out was more efficient than 82%, it was an Ideal Logic, but not sure which size, so either 89 or 94% efficient. Even if it was 94% efficient it's still a saving of just under £100 without the carbon emissions. Also a lot of the consumed electricity came from my solar PV during the sunnier months.
Today it's 6 - 7 degrees outside, the HP has been on most of the morning with a set point of 19 in the lounge and the temperature has only gotten to 19.5, not 20 as it does on warmer days such as yesterday when it will go then go off at 20. Does this make it necessary to adjust the WC at all? I'm just thinking with my COP been pretty decent, is there much to gain?
It sounds like you're close enough. It's impossible to use WC alone to control room temperature and be 100% right in all weather conditions. You're down to 0.5 degrees discrepancy now and that's very good.
It sounds like you're close enough. It's impossible to use WC alone to control room temperature and be 100% right in all weather conditions. You're down to 0.5 degrees discrepancy now and that's very good.
