Air source heat pump electricity consumption in November

by Mars
Home farm

As temperatures outside drop, our air source heat pump has had to kick into higher gear. As part of our ongoing series to share the efficiency and performance of our pump in a period property, we’ve shared our November numbers in this post.

The data for November is not 100% accurate because the electric meter counter stopped recording midway through November 27, 2020. Global Energy Systems rebooted the logging equipment remotely, so we’ve taken an average of the figures from November 27-December 1, 2020, to complete the picture.

If you’d like to see what our numbers were like last month, please refer to our October figures.

Our overall compressor consumption for November was 1,161.24 kWh which was up from October’s 1,031.50 kWh. This makes sense because the average outdoor ambient temperature dropped from 9.32C in October to 8.04 in November.

Based on our current electricity tariff of £0.165 that means we paid £191.60 to heat the entire house and hot water demand last month. The house, with the continued exception of the TV room, has remained at temperature (21C) in most areas, 24 hours a day, which we feel is reasonable.

The test, as it was last year, will be December, January and February. We have done a lot of work around the house to better insulate it, so it’ll be interesting to see if it reduces compressor consumption. Rooms do feel warmer, and stay warmer for longer.

We are still looking at new ways to improve the efficiency of our heating throughout the property. Watch this space.

Subscribe
Notify of
guest
23 Comments
Oldest
Newest Most Voted
Inline Feedbacks
View all comments
Andras Meszaros
Andras Meszaros
1 year ago

What is the total floor area of your house?

Andras Meszaros
Andras Meszaros
Reply to  Mars
1 year ago

I would say that is very inpresive for such large old house!

guy
guy
Reply to  Andras Meszaros
1 month ago

I was going to ask if you have floor plans of your house.

Andras Meszaros
Andras Meszaros
1 year ago

Sorry forgot to ask how many sqvered meter is heated with underfloor heating and how many is with radiators? U mentioned that your flow temperature is 45 degrees. Is 45 goes through your underfloor as well or does it get rudiced ? Does your system not reduce flow temperature acording to outside ambian temperature? I have a Samsung system and it rekons it saves me 25% if i set it to weather dependent mode insted of constan temperature.

Andras Meszaros
Andras Meszaros
1 year ago

Yes it does. It is a great feature. https://youtu.be/qR0uGJDbuIE
In this link if u go to 4:45 they are atchally showing how to set it up in a Samsung heat pump. Have great day!

George
George
1 year ago

For November our 14kw ecodan and 500l cylinder total consumption was 1350.6kWh up from 1164.6 from October. Its running on a weather compensation setting so the flow temp is higher than October.

Is there a particular reason for the current electricity supplier as your unit rate is quite high. Providers are currently offering 10.8p if you shop around which makes quite a difference when running a heat pump over winter. Our costs for November were £160.72

Do you run the log burner(s) every day? We have ours on every night and if its a windy day we start it up around lunch time.

George
George
1 year ago

We currently use Symbio and they are offering a variable contract or fixed 12 month term for 10.8p

The customer support is non existent but if you always remember to submit your reading each month you shouldn’t have a problem.

They also offer variable direct debit billing which I prefer as we pay for exactly what we use each month and they adjust your direct debit each month after you submit a meter reading instead of being charged £200 a month every month and waiting ages for it to balance out.

Sue Charter
Sue Charter
1 year ago

Hi we had a 12kW NIBE ASHP installed in Oct 2020 to 4 bed barn conversion 150sqm in Ripley, Surrey. I started by setting the system to drop back to 16 degrees overnight then up to 20 in main living area, 18 in bedrooms, it’s now just drops by a degree overnight but struggles to hit 20 by midday on the cold days. I wasn’t convinced to run the system at our top temp for 24 hours a day as the nights are much colder and therefore require more work to maintain but I was told by the installer it’s still more efficient to keep to a set temperature all day. It sounds like this is what you do but I wondered if you had arrived at that decision by trying different options and looking at cost? Great site by the way, try interesting read.

Sue Charter
Sue Charter
Reply to  Mars
1 year ago

Thank you Mars. We have also installed 6KW of solar panels with Solar Edge so, like you, I have a handy display which shows all consumption. The spikes have definitely dropped over the last two days as I’m now only running with a 1 degree difference between night and day. I’ll give it a week and then try constant temp.

I can see how much we are consuming and assume this relates to what we are using to power everything including the air source but I don’t have any means of seeing what I’m really needing as you do. So I can’t calculate a coefficient or have I got that wrong?

My other thought is that I want to make sure that all excess solar power goes to heat water and not have the ASHP jump in. In winter there’s little or no excess but as we get into warmer months I want to restrict the ASHP from heating water in daylight hours and only top up at night. Is this something you have satisfactorily configured?

Thanks again.

Sue Charter
Sue Charter
Reply to  Mars
1 year ago

Hi Mars,

Our supplier/installer GreenSquare in Bramley are managing the RHI application currently. I’ve raised the meter question with them but looking at the Ofgem site it suggests your payment meter is needed because you have the back up oil boiler and we don’t have that. Ours was removed because it needed replacing. The performance meter is the one I’m not sure about, hopefully I’ll get a response soon. https://www.ofgem.gov.uk/environmental-programmes/domestic-rhi/applicants/eligible-heating-systems/do-i-need-metering is the page I found.

We have a NIBE 12kw system. I’ve also asked our supplier about calculations the COP.

On hot water, we have an eddi which is the same as an iBoost I believe. However, today I noticed we exported a very small amount of energy and I don’t want to export anything in winter. You seem to be sure that iBoost doesn’t get beaten to your hot water tank by the air source. With the old oil boiler I can just switch the hot water off in the day and get it to come on early evening to top up. With the air source I haven’t yet discovered how to do this or even if I need to do this. Again, I’ve contacted both my solar supplier and GreenSquare for best solution today. The tank must be hot to capacity if I am exporting so I’m thinking the air source programmed to heat hot water full time – I’ll do a bit more research!

Sue Charter
Sue Charter
Reply to  Mars
1 year ago

Hi Mars,

Yes the meter is a 2nd generation one and does give KwH. Since your last message I’ve talked to all parties and we are now upgrading some radiators as they recommended, installing a new one on a mezzanine floor and had confirmation that we are fully compliant with RHI. The installers have raised the tank temp by another degree which will get tested on Xmas day when the outdoor temp drops but we are running comfortably at the moment. From your advise on the 10th on keeping temps constant we have used considerably less energy so thank you.

On the water front, it’s been suggested that I can schedule the air source hot water to give the solar full control over daylight hours. Our system blasts the temp to 60 degrees once a week overnight so I’m pondering your suggestion vs just switching off the hot water element during the day. It’s not an issue at the moment but maybe I’ll try a few variants and see how it works out.

I hope that you and your family have a lovely Xmas and thank you again for your responses and advice.

Sue+Charter
Sue+Charter
Reply to  Mars
1 year ago

Hi Mars, you asked me to let you know about the hot water – I asked some questions and checked the wiring options with the Eddi and what seems to make sense to me, but yet to be proven, is to schedule the heat pump for hot water to be on only when the solar panels are normally active i.e 830am to 630pm. My logic is that any excess power during the day (and we did have plenty on the warmer sunnier days recently) should power the heat pump to heat the water as it is a far more efficient way to heat water than the immersion, any further excess should then increase the water temp of the hot water using the immersion over and above the temp reached by the heat pump towards 60C max. Any further excess will be exported. My reason for disabling the heat pump hot water overnight means that our small use in the evening will not be recovered until the following day when the panels activate again. This latter part is geared at warmer months as a way of limiting the heat pumps use of mains electric as far as hot water is concerned.

The Eddi is wired to give the heat pump priority – Option 13 in this manual https://myenergi.com/wp-content/uploads/2019/04/eddi_manual_v2.3_english.pdf.

I think adjustment on scheduling over the year will happen especially if we don’t have enough hot water in the mornings or I’ll just not close down at night to see if there’s any real difference – possibly not. The key fact I hadn’t twigged when we last spoke is that the heat pump makes more efficient use of the excess than the immersion so I just need to let it sort itself out and monitor.

Kind regards,

Sue

You may also like

23
0
Please leave a comment – we'd love to hear what you thinkx
()
x
%d bloggers like this: