We even got to see a defrost cycle! Mrs was wondering over breakfast what's that smoke coming out of the heat pump, and she was worried something was going wrong. Had to explain what and why. I think she is starting to take more interest, now that most of the rooms are nice and toasty. Couple of rads are a bit cold, I assume they need balancing as it was quite late when the commissioning was complete.

The insights tab suggests a COP of 3.16, not bad given it was a cold start and lot of heating to do to get the house upto temperature.

@chandykris agreed! Several times the cloud triggered our door camera. Glad to hear that you’re getting up to temp.

@chandykris All sounds good and I daresay they'll sort out the balancing etc.  At least you'll be able to get over the installation problems: I can imagine the frosty air in our house if that happens on our install!!

@mikeh Watched your latest YouTube video today. Thanks for the good work.

In the video you talk about the hot water schedule during off-peak hours. I wanted to do the same as we have an EV tariff. However, the installer mentioned that if you run hot water only once a day, the heat pump has to work extra hard, and any savings I get from off-peak reduced rates will even out. How is the off-peak schedule working for you? Do you see any impact on heating after the hot water cycle ends, as in does the consumption spike as heating hasn't run for how much ever longer it took for hot water. I wonder whether I should set the same and check for a few days. We did get a COP of 4.25 yesterday, but whether that's only heating or includes DHW, not sure 

@chandykris I'm pleased you liked the video. That's an interesting point. The heatpump has to work longer but it's still bringing the hot water to the same temperature so im bot sure. I guess the cylinder will be cooler so its possible. Before we switched to a schedul and time of use tariff, the heatpump would kick in to warm the water after one shower or even after running a large sink or water. These heated the cylinder back up quite quickly at times, which I'd have thought would be like short cycling which isn't good efficiency wise. The night tariff is 7p so I can't see the efficiency drop to the point it works out more expensive to run. The new heat output figures show data from August when we only had hot water so the figure must include both hot water and home heating. I'd be interested to hear if you see any efficiency change if you switch. Otherwise that's a great idea for a video in summer when the data is only hot water.

@mikeh I thought so too, the efficiency can't be that bad if you run the hot water once at night. Yes, maybe when you have visitors and during Christmas time when more hot water is used up. But, that can be easily changed on the app.

Thanks for the note on the app showing data from August, that makes sense. I wonder whether Aira are able to split the data by heating and hot water in the future iteration of their app, one for their product team to consider.

I have set the hot water schedule during off peak times now, will monitor COP over the next few days and post here.

@mikeh It's running on an off peak schedule now. To be honest, I don't see a drop in COP. There was only 10 minutes of hot water left yesterday night, and it topped up fully today morning. But, still the COP is more than 3.25, not bad for a very cold day here. I think, by end of the day it should go back to around 3.6 to 4 COP. So, I am going to keep it on schedule now. Maybe, tweak that from March onwards when we get excess solar and days will be warmer, then I can schedule it during the daytime. Even then, the cost of export at 15 p exceeds import at 8 p, so not sure whether it makes economic sense, other than just the joy of using the electricity you produce for hot water.

Aira continues to  improve features in its App. Now I can see Under Efficiency the CoP for the previous month for both heating and hot water, as well as, Savings.

I have to say that the Savings are rather generic for both CO2 and Cost Savings. They seem to based on some Electricity and Gas prices. It'd be nice if we could manually enter our prices or even link to a Tariff. 

So here's a question: how does a CoP for Heating of 4.1 and 2.6 for Hot Water sound? 

Also I still want to have a data download from Aira. I have continued to ask them.

@vsmith1 Thos COPs sound quite respectable, the lower one illustrates how flow temperatures influences efficiency, those extra~20 degrees required to heat the water take their toll. But yes, quite respectable. Mine (Daikin) which provides heating but not hot water shows a COP of ~4 - 4.5 a lot of the time, but, in Jan. and so far this month, the figure is more like 2.75. Regards, Toodles.

Just to close this one out.  The relaxation of the planning regs meant I could move closer to the boundary. This put it closer to the fence blocking line of sight which changes the noise calls and brought it within requirements for noise too…

therefore the unit was installed with no planning permission.  

the unit has been in now for 4 weeks. Octopus team were fantastic and got the unit in tank in the loft and all 13 rads changed for under £1400! While they took me to the cleaners with regards to tea bags and biscuits they were brilliant.  2 weeks on I lost a bit of pressure and the engineer was out within hours stayed until the issue was found and fixed then stayed on to take me back through everything in detail. Cannot speak highly enough about the service provided.

Also pleased to say the unit a 4kw Daikin is not noisy.

@vsmith1 I too took saw that today. Pretty chuffed with heating CoP of 4.2 and hot water CoP of 3. Especially, when the weather was particularly cold.

Just to add some Hot Water details:

We are set on Eco Saver which is 55degC and our tank (100l) will last 14-18 minutes. We are letting Aira choose when to heat the water. 

I read, elsewhere, that changing to a manual schedule to use our cheap rate (23:30-05:30) may not save us any more electricity. There are just the two of us, with only hot water for limited kitchen use and showers.