Heat Pumps - post here.

Had I known the chill would be an issue I'd have chosen it in the original renovation but now that I haven't I'm looking first it what I can do with what I have.

I might go back and do it at some stage, I had assumed it would be a invasive job so hadn't given it serious thought...yet

MOst of us on here that show energy usage graphs use Home Assistant Home Assistant (home-assistant.io) as a system to manage energy and home automations. I use this and then I use a ShellyEM Shelly EM + 50A Clamp - Shelly EM + 120A Clamp - All Product - Products - Shelly to actually log the HP circuit.

Going back to your energy usage my Heat Pump used in November 461kWh and October only 192 kWh.... BUT so far in December its 513 kWh and we only half way through!!. This includes all hot water etc

My thoughts are that your room temps might be a bit high, I have nothing set to 22deg, if I did my HP would be on all the time and I live in a very well insulated airtight house (A1 BER) Bedrooms should be 18-19 degs, all other living rooms 20-21 degs. That should make a big difference. In fact I have nothing set over 20 deg. I might set the living room to 21-21.5 in a evening if I wanted it to be toasty.

Another thing is this weather at the moment I wouldn't be too overly concerned as this is exceptional cold weather we are having.

Thanks appreciate the comments.

Water setting = Flow temp here I'm assuming. Set this to 30c...or even lower than 40c?

Where are you based? There are loads of different companies with engineers that can check them over and sort most issues. They’re basically air conditioning units so refrigeration companies are good too

I can pm you a lad that looks after my heatpump he’s based in oldcastle ir athboy area used to work for midland?

I have a Bosch/IVT heatpump installed for about five years but have only recently started tracking usage using a Husdata H66 https://husdata.se/produkter.asp?prodid=18

It works very well with HA and allows full control with various heatpump makes and you can view the sensor values.

I've noticed the real issue with power usage is when the auxiliary heater kicks in, below about - 4 for me. It has a staged capacity of up 9kw, and used 80kwh one day last week by itself! For comparison, the compressor capacity is only 2kw. It is basically an immersion heater.

Hmmm, the most we used was 18kWh when the high was -2 and low was -8 here. we used 18kWh 2 days in a row, about 10-12kWh a day during the bitter cold spell just there. Thats just underfloor heating not hotwater.

Can't you turn off the auxiliary heater in the settings? One of the first things I did, not a Bosch/IVT though.

I would take much from the last 10 or so days that weather was exceptional....my daily consumption is now back down to under 20 kWh/day. As you can see from the graph I nearly touched 60 kWh/day a couple of days last week and consistently between 30-40 kWh/day. This includes all hot water as well.

I don't mind the expectational cold weather because that's rare and dont read too much into that. You need to keep an eye on normal days and are you using too much or is your HP on all the time.

The second graph below also is showing even though the heating was coming on it was only using about 1.5 kW and only for a half hour or so each time so only actually consuming 0.75 kWh. During the really cold nights (-4 to -5) the HP was up at 4.5kW so it was working a lot harder.

Currently renting a new build mid floor A2 apartment with HP (rads no UF) and MHRV, honestly not convinced by the HP tech at this stage at all. Cost isnt cheap to run at all and when things go wrong ie auxillary kicks in bills skyrocket also the heat can feel sometimes not adequate.

Would definetely make me reconsider if carrying out a renovation project (its fine now as the landlord is on the hook for all the callouts), this is coming from someone who thought the tech was the best thing since sliced bread a year ago.

Another thing i've noticed from the contractors who visited, they all seemed to have different ideas of what the ideal settings were.

I had no issue with reaching the set temps inside recently with it turned off. But obviously will vary by HP, house etc.

The COP of mine is rated at 2.68 for -7°C outside and a flow temp of 35°C, so it is still a lot better than an electrical element coming on.

All of what you said may have merit but I’ve had one for 10 years and yes you have to educate yourself and work out what’s best for your house as regards settings but I know for sure they work.

as for oil and gas yes the tech is there and we are used to it but you can’t make oil or at least not cost effectively and it’s running out. You can make electricity. Set the whole think up so that it runs from the sun and you become close to energy independent.

of course you require battery storage but that’s for a different thread. Oil is going and Russia have gone a long way in terms of wiping out gas in the medium term. Electricity, more especially green electricity would seem to be an easy win.

To me it really highlights the need / practice of having all of your home heated all of the time versus a modern gas system where you can modulate individual rooms regularly, particularly in retrofits where non-optimal airtightness and insulation may be present

Thankfully for us with A2W heatpumps in Ireland -20c has never been recorded here.

For me there is a noticeable increase in energy usage at about -3c or -4c. But still much cheaper and better than burning things for heat.

Hi crew - a quick question that might fit in here. I have a Nibe ERS 10-400 extractor to go along with my heat pump in my new house and last week I got a quote of roughly €200 for two new filters for it.

I see there are third party filters going for dramatically cheaper - in the range of €20-€40. Does anybody have recommendations for high quality filters that are cheaper than the Nibe ones? Or are the big bucks worth it for the originals?