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Heat Pump Running Costs
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@feelings There are some high readings there I would have thought, especially when they are running UFH. There is a bit of a learning curve with them so worth the time getting to understand the settings and how they affect your home. Also worth checking out the 'Air to Water Heat Pumps Ireland' group on FB.
When changing settings it can take a day or two to see how they affect things.
We are a 165m2 2006 built bungalow, upgraded doors, windows and walls pumped with walltite and all rads. Two rads changed for larger doubles and one triple, all other doubles remained. Heat Loss at about 6900 with a 8kW Viessmann heat pump with 250L cylinder, HLI 1.78. We are now A1 rated with a sizeable reason for that being the Solar PV.
We only have 1 zone and run purely on Weather Comp at 19° with a setback between 22:00-04:00 to 17° and a boost between 04:00 - 06:00 to 21°. We may remove the 21° timeslot which would probably improve things slightly more, but we are on a cheap EV rate then so not the end of the world. DHW heated once overnight to 47° and again we may tweak this and just have it topping up using a hysteresis of 3-5° to see what energy this uses in comparison.
We had a great installer but even at that we have tweaked a few things.
Check your electrical backup. We originally had our DWH set in 'comfort' mode and the installer told us to change this to 'Eco' mode as it was using too much energy. The reason for this was that in 'comfort' it heats up quicker but using the back up heater to achieve this. Not sure what the setting is for your ASHP.
Here are our readings for Jan with the most used being just below 33kWh on Wednesday when outside temp didn't go above 0°.
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Well its good to get back to normal miserable weather… I have now had a bit of time to look at how well my heating strategy worked for the artic weather we had last week. On Thursday I maxed out at 38kWh for that that day, up until this week I was averaging about 20kWh/day at most. (This is including DHW)
I think my strategy of heating in the middle of the night for two hours to get thermal mass into the house and then for 2 hours only in the afternoon works only in a "normal" Irish winters day. I'm saying a normal Irish winters day would be mid to high single digits and up to low teens with the occasional frost.
Heating the house with the weather we had last week worked up to a point but I did feel some of the rooms got a bit lower than I would have liked, bedrooms got to 17 and living areas got nearly to 18 once or twice before I had to go all out. I didnt get any complaints off the Fam but if I lived in Norway and got this weather all the time then I think I would do it differently, eg have the heating on all day and I now know why they do that in Scandinavia. I live south of Cork city and only got a slight dusting of snow and it didn't get as low as up the country but I think it got down to around -5c on the Wednesday night.
All in all I think everybody's situation is different and you have to find the best solution for your house for the average winters day and exceptional week we just had then those rules go out the door.
For me I think it will be a waste having the heating on all day there is not need for it for 90%+ of winters days. What I found out that trying to catch back up was difficult enough when its deep in the negative numbers with the low flow temps of UFH.
That saying I did look back to last January and I did some days in the mid to high 40s kWh and a max of 49kWh so something is working. Last year I was heating room by room…now if I am heating I am heating the entire house eg one or two zones.
6.1kWp south facing, South of Cork City
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At the moment I am just using the timer schedule on my Joule thermostats (below) which are in every room. They do have a setback temp but I have set this to 15degs so as not for any of my 12 zones to come on when not needed. What I do then is artificially set the temp high when I want the heating to come on so all the zones are open and it heats the entire house for the set period I want it on. In the EV tariff I have them all set to 23degs and let it go mad..
For the evening I have them set at a more realistic temp 21 or even less as if its warm enough I want them to go off as soon as possible, but I do and try keep as many zones open as possible.
I think in another cold snap I will just go back to manual mode and set them at what ever temp is required and it will call when needed to keep it up but try and keep as many open as possible.
6.1kWp south facing, South of Cork City
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HA aggregates the data hourly in the Energy dashboard, but all of the back-end data is saved in HA.
In HA, go to Settings, Devices & Services, Shelly, and then to the EM device and you'll see all the data sources.
You can create a new view, card or entity on the main one to show any of those Sensors above.
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