Heat Pump Running Costs

Yep. And if you have an SD card, you can log all that data. Very handy system in fairness

What brand heat pump?

A Shelly EM or similar monitor would do the job for consumption but energy output would likely need to be gotten from the heat pump unit itself.

The Mitsubishi WiFi connection module was thrown in for free by my installer (after a bit of moaning). They are sub 200 to buy from memory.

Ecodan unit.

Installed the wifi unit but the app isn't reporting the daily useage.

Have the home assistant component installed but there's 0 coming back for daily usage.

Im convinced daily data is there but you need to learn how to run a report on the app?

220m2 renovated A3. Airtight and hrv ufh though out-1 zone. For the last year I have been running it on room temp mode cause that what installer advised. He also advised against multiple zones and instead said to play around with the valves on the manifold to control heat in the different rooms.

In room temp mode I was getting a cop of ~ 1:4 fairly consistently, but last few weeks I have tried weather comp and am now over the last week getting 1:6 COP(sometimes more).

Attached is my usage and delivered energy for December so far. This has temps comfortable for us 20/21 degree.

My WC curve isnt actually much of a curve. 25 degrees @ -4 to 22 degrees @-15

Yes flow temp is low. Although house has BER rating of A3, I think it is actually higher than that becuase BER assessor didnt include the HRV becuase I commisioned it myself. Also an area of the building was renovated prior to him coming to assess it so he had to put it down as default to some other time I think. I didnt much care him underestimating the BER because it was still over what was requirted for heatpump grant.

Also im not sure im quite following you. . surly 6 units generating 30 is a COP of 5? Whats the COP on atatched then? this seems to be the strongest day I had on the 8th.

Can you take a screenshot of your whole year view inc hot water? just interested as im ecodan with A2.

D'oh, brain can't multiple in the morning. Yes, 6 units generating 30 is a COP of 5. Which is still a great COP

What has this got to do with Heat Pump running costs ?????

here you go,

What temp are your bedrooms at night? No heat source is not sustainable if you want rooms to be 19/20 Degrees in December,

Real world data, go here and you can see installs by location. UK, but weather will be similar and can go further north to get a colder example: HeatpumpMonitor.org

Click into the 'summary' on the right, and can then click on ‘Open Emoncms Heat Pump Dashboard’ on top right to get more detailed data. And can then get a 3 month view showing data energy usage, daily temp, COP….

If you want to dive more into it, look at the Glyn Hudson punter. He’s brill. Has 2 self install videos on YouTube for his own (Samsung) and more recently his parents (Vaillant). His house is small but old and not insulated or airtight. In his home he's running 30C flow temp but he’s added 3 rads in the sitting room to produce the heat (which won’t work for most people of course). But he’s into a very good COP so willing to trade space in the house (in extra rads) for that. His folks are older with a larger home so you'd expect it's running a higher temp so using more energy than his home. either home have UFH. Glyn Hudson - YouTube. One of his vids covers stats on the winter just gone (which had the long cold snap in Dec). Playlist: Heat Pump - YouTube

Yes it's milder than normal but I'm still surprised you at zero heating. It has still been sub 10 degrees for long periods. For you to not need heat at all your house must be passive or have an alternative heat source. Certainly not enough solar gain this weather. Is it detached? Do you have a stove? Simply HAS to be an alternative heat source your not mentioning. Surly science means this is the case.

Maybe I'm wrong but I honestly don't think we are getting the full context of your set up, which I don't think is helpful in this thread.

I’m on the same plan as yourself, but not sure in winter months that you could run entire house inc heat pump on batteries. What size battery setup? I would want 20/25kw to achieve that. Not counting Sub zero temps

ah nice, DIY or off the shelf? Have TAMS in at the moment for 50 panels any advice greatly appreciated.

Hi there,

Cool graph. Would you mind explaining it to me please.

Hot water load looks consistent over the year, which makes sense as we generally use same amounts of water over the year, but the COP of the heat pump will change according to outside temperature- more efficient on hot days. I would have expected more of a drop off in energy for hot water generation in summer compared to winter, due to the cop increasing

When heat pumps are turned on for the first time and it's during winter they will use alot at first to get the fabric of the building up to temps. After that they take much less to keep it there. Especially if you have good insulation.

2nd week should have more accurate results. Doesn't your heat pump and in a built in energy monitor?

The heat pump only registers energy consumed by the compressor. It does not account for electricity used for fan, water pump and electronics.

It is intended design, to fairly compare this energy source to other. Oil, coal, pellet etc. These do not account for electricity used for fans, pumps and electronics either.

I don't think you should guestimate a years heating to be €1000 from one month measured in Nov. There is plenty better info on this thread if you read back. I have a 220m2 house A3 and I used 1150 units (heating only) in a year which is approx €350

Every house is different and personally I don't think BER is very accurate. I'd put more emphasis on actual build quality/design and attention to detail when insulating. BER doesn't measure this.

Also airtightness in combination with heat recovery ventilation makes a massive difference to actual heat retention but makes little difference to BER rating.