Heat Pumps - post here.

What’s a split system

How long is a piece of string maybe I just want to get a handle on how efficient or inefficient my geothermal system is. Is there a go to guide to work it out? I've looked at a few guides/methods but tbh at first glance it's complicated.

3000 square foot. B rated. 2009 built and the pump dates from that year too. Detached. Target temp is 22 overnight. I'd like to get to grips with what I should expect to see in terms of kWh per day (with respect to outside temp I know). But average during winter. The geothermal pump has a separate meter so I know exactly what it uses.

Thanks.

So I have a b2 rated house about 325 sq metre. So I should work off around 32500kw required.

Assuming around 26% of energy usage is in November and December combined, that would be about 8300kw, and a bill of 2300kw with COP of 3.5. So about 430 quid, or 7euro a day in winter.

mine was double that unfortunately 😟 still trying to isolate issue

kcross is your house b2? Your usage does seem fairly close to mine to be fair to my pump!

it’s possible I have got a bit shafted by electric provider too. I need to review the package I have. The standing charge doesn’t look special and I’d say I am average 16cents per kw, with a day night meter.

last bill, 2 months, was more than the 850 you quote for the year though!

out of interest, do you have many room stats? Do you try to shift usage to night time?

Im interested to hear if anyone with a heat pump compliments their electricty with Solar PV

We are installing a heat pump and UFH while retrofitting/refurbishing a 1980's house. Some of the bills are starting to give me the heebee geebees!

Orientation and roof size are favourable for a 6KWH system so I'm wondering is it worth the outlay

As mr Q

how much floor insulation are u putting in?

Something not right there! Thats well beyond what it should be. I misread your figures above, your figures were for 2 months, not a year! 😲

Have you had it serviced or anyone out to look at it? There could be any number of things wrong. Sounds like it needs a good set of diagnostics run on it (pressures, valves, pumps, brine etc). Tweaking schedules isnt going to bring it down from 75kWh's... something more fundamental is wrong. Get someone out asap.

excuse my ignorance but what is 'HLI' and 'COP'

Thanks M for this Heat Loss Indicator and Coefficient of Performance

The key point here is that if the criteria are not met post install no grant gets paid. its a very common problem, the former is a design problem, the latter is a heat pump section issue, so the one out of the back of the van just wont do

I have an owl energy meter, not a separate meter but I can see what’s going on with updates every 5 or 10 seconds.

When heat pump is on it adds about 4.5-5kw to the reading. My base load is about 500w per hour, so 12kw, add a bit for water and cooker. So about 48-50kw per day is linked to the pump.

i did think it could be an element, but I believe I have all elements off.

14kw pump, Dimplex. Yes can hear the compressor. I believe it should be 3.7kw under normal circumstances, plus a circulation pump or two, plus the base load of 500w, 5kw, more under pressure. Someone due next week for a proper look.

Just moved into my new house I built its A2 rated (prelim BER) 2.4 air tightness and hopefully pushing A1 as I didnt have the Solar PV accounted for in the Part L pre BER.

Anyway I have an Joule Samsung A2W and this is a typical day for me. My heat pump is accounting for half if not more of my total energy use. I put a ShellyEM on the heat pump circuit to be able to see when its coming on and for what reason. Also I just checked the unit and in January is says I used 750 kWh....

I know why its that high now... it the bloody half hour showers my two teenage kids have 😡 The yellow line below is when the HP is kicking in and as you can see over night last night the house held its temp so ne need for heating, but then in the morning they hit the showers. Then when they come back from school and training they are back in the shower 😨 Its a political thing here at the moment in that this is our dream house and our showers are fancy 3bar 300 liter tanks so they never run dry and I don't want to and my missus gives out to me if I tell them to get out. The two lads try their best to run it dry but fair play my system can take it unfortunately (they are fantastic showers though!!) But you cant avoid physics and to heat 300 liters of water by 30degs in one hour can take about 10kWh (according to the google machine)

Anyway I am hoping come the longer days my PV system will take some of the punishment.

2.4 on a new build??

For comparisons last month (Jan) we used 82 kWh for hot water and 181 kWh for heat.

What do you have your hot water temp set at?

8kw Mitsubishi Ecodan A2W

I imagine I’m not the only person wandering into this sub-forum after today’s announcements.

I’m finding it hard to get an estimate of how much it would cost to retrofit an air to water pump. My house is 2,750 square foot, built in 09, well insulated. We installed oil powered underfloor downstairs and rads upstairs. I suppose the first step is getting a registered contractor and a BER to ensure we’d be eligible for the grant. I don’t think I can stand another year of oil prices hitting near €1,500 for the year!