ASHP planning the big turn on day

2

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  • We took advantage of the 11p per kWh tracker rate today and took the heat pump for a spin. So far used 9kwh for 13 hours use and to be honest that's not bad for first fire up when it has to heat up the cold underfloor slab and the main room temps set to 22oC.

    We had a high of 12oc and it was 5oC this morning at 6am.

    Predicted 3oC overnight and 10oC tomorrow.

    Tracker is 16p tomorrow so will just roll with this and going to leave it on 24/7 low and slow on the weather compensation curve unless a heatwave comes in again.
  • matt_drummer
    matt_drummer Posts: 1,341 Forumite
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    edited 14 October 2023 at 7:46PM
    I turned mine on for the first time in anger a couple of hours ago.

    I am trying to use pure weather compensation but it is still tied to the Madoka room thermostat for some reason.

    I don't want it to be so I will read the manual again tomorrow.

    Annoyingly one of the two radiators that was replaced by Octopus is not getting hot, can't really see why, need to investigate tomorrow.

    Currently about 7c outside and running around 400% efficient, I'm OK with that.

    My temperature inside is set at 22c also.

    And it's really good, just feels warm if I go outside and came back in, just what I was expecting and hoping for.
  • matt_drummer
    matt_drummer Posts: 1,341 Forumite
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    The heat pump is about half the price of gas for me today.

    If gas was 7p per kWh and my boiler was 90% efficient the my gas would have cost 7.8p per kWh.

    My heat pump is costing (at most) 16.89p per kWh so to generate the same amount of heat I would have used 7.8p x 4 which is 31.2p, nearly twice what the heat pump is costing.

    Not bad!
  • QrizB
    QrizB Posts: 13,822 Forumite
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    My heat pump is costing (at most) 16.89p per kWh so to generate the same amount of heat I would have used 7.8p x 4 which is 31.2p, nearly twice what the heat pump is costing.
    Is your COP of 4 assumed, or has it been measured by your fancy new instrumentation?
    Not trying to argue, just curious!

    N. Hampshire, he/him. Octopus Go elec & Tracker gas / Shell BB / Lyca mobi. Ripple Kirk Hill member.
    2.72kWp PV facing SSW installed Jan 2012. 11 x 247w panels, 3.6kw inverter. 30MWh generated, long-term average 2.6 Os.
    Taking a break, hope to be back eventually.
    Ofgem cap table, Ofgem cap explainer. Economy 7 cap explainer. Gas vs E7 vs peak elec heating costs.
  • matt_drummer
    matt_drummer Posts: 1,341 Forumite
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    It is measured by a billing quality heat meter and electricity meters.

    It is certified for billing use in circumstances such as communal heating.

    It wasn't cheap.

    I have gone so far with my solar and battery installation and have so much information available I just felt this completed it. Not really necessary as it agrees with my heat pump data from the controller, I just wanted the information at a more detailed level.

    The monitoring is really good and I can see much more than just COP.

    I may have some plans in the future to document what I have done with everything but I have a bit of a distraction in terms of a job!

  • matt_drummer
    matt_drummer Posts: 1,341 Forumite
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    I was going to extract the data from the heat pump directly but it involves Home Assistant.

    I still may do it but I have never found anything so difficult. I'm not stupid but the language used and the level of assumed knowledge just makes it really troublesome to setup.

    I have everything necessary but things like usb drives getting corrupted and needing hardware and specialist knowledge make it a painful process.

    Maybe I'm just a bit too old!
  • matt_drummer
    matt_drummer Posts: 1,341 Forumite
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    My wife just came home from work.

    She commented on how cold it was outside and noticed immediately that the heating was on.

    The radiators are luke warm and it feels no different in the house to when we had a gas boiler.

    It is exactly what I expected.

    I'm sitting in our conservatory and its nice and warm and no different to the gas heating in terms of how it feels.

    It's no different apart from the cost and I know I'm not burning anything, all our heat is coming from the sun at the moment.

    I am really pleased with our choices.
  • shinytop
    shinytop Posts: 2,097 Forumite
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    Glad you like it.  The novelty of the heating coming on will soon pass.  There is endless fun to be had fiddling around with the ASHP and the numbers you get from it, especially if you have proper monitoring. 

    I've never tried myself but you're not the first person I've seen having trouble integrating heat pumps with HA.
  • matt_drummer
    matt_drummer Posts: 1,341 Forumite
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    Yes, I just said to my wife that I will soon lose interest in the heating, just like I did with the solar panels and batteries which I was checking every few minutes for a while!

    It's going OK with the heat pump after 48 hours of heating.

    I have messed around a bit.

    I wanted to use pure weather compensation but I don't like it at the moment so I am on weather compensation with the thermostat as a top limit.

    The trouble with pure weather compensation on this Dakin heat pump is there is no scheduling available, so I can't turn it off or down at night without manual intervention.

    I don't want that as I want it to heat before we get up in the morning.

    But maybe I have missed something in the setup but yesterday was so cold I didn't want to mess about.

    My COP doesn't look so great at the moment but I am still playing.

    I am at about 3.0 today which is OK and I am happy with that but I think I can do better.

    I knocked back the weather curve by 3c this afternoon and since then I am closer to 4.0 as I was yesterday on pure weather compensation without the room stat.

    But I am also being a bit greedy with heat, I have whacked it up to 23c this evening as I like it and it's not costing very much!

    It has used 15kWh today including heating the tank twice as we had baths and the cost on Cosy Octopus was £2.50 although I don't know how much I actually paid for as some of it would have come from solar.

    I have charged my batteries on the afternoon Cosy slot between 13.00 and 16.00 but I didn't import the full 15 kWh used by the heat pump today.

    My real cost is hard to assess but it's not much and definately no more than I am happy to pay.


    Mainly just happy to be warm and not burning gas.






  • matt_drummer
    matt_drummer Posts: 1,341 Forumite
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    shinytop said:
    I've never tried myself but you're not the first person I've seen having trouble integrating heat pumps with HA.
    Maybe I'm just old, but I find HA a nightmare, not using it, just installing it.

    Even more so what to install it on.

    I know some stuff but not being able to just install a piece of software on you computer does my head in.

    Virtual machines (I understand this) docker (????) and all sorts of other stuff, why so difficult!
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