(unitl recent unit prices) That's what, >70KwH electrical input - indicates something seriously wrong with the way it is set up or commissioned. As net input to a heatpump system, that order of magnitude should broil you. Whats the building like/ age etc?
I've posted regarding heat pumps on another old thread, I'll find it and copy/paste below - contains all my replies to multiple posts so may not make sense.
"In 2013 DGHP Housing association removed my open fire with back boiler and 6 radiators which gave enough heat to have windows open in winter whilst sitting in pants and fitted a Daikin altherma heat pump system and new radiators to my uninsulated and draughty late 80’s built 1 bed bungalow in Galloway, part of some bullshit government scheme to claim they were going green, there is no gas supply where I live. My electricity costs went from £10ish to £40+ per week in winter as the system doesn’t work in low temps nor with the build quality in the house. Two years ago they fitted a Tesla power wall battery to attempt to offset the running costs, saved a couple of £ but still bloody useless.
So I knocked back through the bricked up fireplace and fitted a wood burning stove/lined the chimney as I have access to unlimited seasoned logs from a friends farm/forest. This caused much upset from the housing association and they threatened me with eviction so I paid for an independent report regarding the fitting of such a heat pump to my poorly insulated house which showed that it was an unsuitable system to install and should not have been fitted.
In a new house built to modern insulation standards with underfloor heating I imagine they are a great choice but not in a 40yr old draughty poorly constructed and insulated bungalow, especially as I have secondary progressive MS and need heat & warmth
The housing partnership that took over dumfries & galloway council housing stock received a green initiative grant to remove coal/open fires from the houses that were not on mains gas, aka greenwashing. They claimed it would be cheaper to run and provide sustainable heating and hot water solutions. Utter ****ing bullshit dressed up as "look at how green and environmental our housing stock is"..............I'm convinced someone on the board of DGHP got backhanders to ensure the refit went ahead but im not allowed to repeat this otherwise ill be taken to court....a mate used to be in charge of housing repairs so im 100% convinced of what I was told.
But the claim made by "experts" was that you can't get water temperatures >50C from heat pumps or retrofit them to existing buildings, laws of physics etc. This is incorrect. Technology is advancing rapidly in this area, and what was true 5 or 10 years ago is not necessarily true any more.
No one was saying you can’t retrofit them to existing buildings at all, in fact they can perform very well on a £ vs kWh cost compared to gas or oil when retrofitted to buildings built before the revision of building insulation regulations 2010, on one provision that is stated time and time again in manufacturers guidelines and is a recognised industry standard, is insulate….insulate……insulate before consideration and ensure you are able to fit underfloor heating, the thermal efficiency of using heat pumps with existing type 22 steel radiators is very poor, aluminium radiators are slightly more efficient but to get the full benefit of such a system you should consider under floor heating laid on top of a well insulated floor.
A close friend recently built his (croation company built/designed, he just paid for it) dream forever modern home kinda similar to a huafhous but cheaper - no less quality though and the house is massive (compared to mine anyway) at 350 square meters compared to my paltry 50 square meters. Super insulated with special triple glazing and polished concrete underfloor heating throughout and he’s using a heat pump system not much larger than what I have fitted yet his heating/electrical costs are a less than 50% of what I spend, despite myself also having a Tesla power wall battery fitted to offset my running costs as it stores cheaper off peak electricity to feed into my daily running costs.
The Tesla battery has saved me a few ££ but the money spent on buying and fitting it would have been better spent by the housing association on replacing the thin air gap 40yr old double glazing and lifting the suspended wooden floors and insulating underneath, also fitting more insulation in the attic, perhaps even fitting solar panels to the roof as the pitch and location of the house is ideal to take advantage of the sun all day but that’s not sexy enough nor as headline grabbing as the housing association proclaiming that “we’re bringing our housing stock up to modern environmental standards by fitting TESLA batteries”. I imagine this was done through the use of environmental grants that ultimately every single householder are subsidising through their electrical bills - the opportunity for grand kickback scams given to “independent companies” are wide open and I’m sure they are being exploited to our detriment.
Quite a rant but it really pisses me off how much an ill thought out improvement for environmental reasons has ended up costing me over 200% more in electricity costs per year and using far more electricity to rub salt into my wounds. Previously I used approx 1500kwh of electricity a year in my tiny 1bed bungalow when I had an open fire/back boiler, last year I used 4600kwh. "
As an aside I see PsB in the other thread regarding heat pumps asked pretty much the exact same questions as he asked in this thread (see below), Just trolling?, or genuinely interested but not listening to replies?.
https://pinkfishmedia.net/forum/threads/domestic-heat-pumps.256192/