Spoogster

I suppose in the worst case, if we had to endure a year of poor ASHP performance we could either a) sort it out at our own cost or b) rip it out and put the old gas boiler back, and flog the kit on eBay! Might break even. Requirement to keep the installation is until end March 2022. Includes remote monitoring and control over that period (eek!) I would be happy to keep it running 24hr through autumn/winter/spring to keep the COP high, so mitigating Zoot's issues. Definitely looking at 12kW pump though

Is there much of a price difference between a 8.5 and 12kW ASHP? Govt are paying so I just need to be pushy I assume. Thanks re size of tank. The Megaflo is 21 years old now so claim unlikely. Costs I got off that wonderful internet thing..... lol.

Govt are funding the trial direct. OVO are just doing the leg work alongside a number of named manufacturers (Mitsubishi, Sunamp, Daikin etc.). Google OVO Heat Trial and you will see the rub. Good blog site by the way - I grew up near Ash (my friend lived there) so know it very well

Not sure I would have the time!!!

Come on @PeterStarck the genie is out of the bottle now!!!

Please enlighten me?

Or put it another way, cost benefit of future proofing your DHW and heat installation? An intangible benefit?

Thanks for the advice re min energy requirement. There is no requirement to switch to OVO with this Govt install

I agree! I just wanted an untainted view on my question, but I appreciate getting all the kit for nothing changes the dynamics.! Question revised then: would you go ahead if Govt was paying for it, even if the running costs are higher?

Reason for ASHP is that we have been selected to join the OVO Govt heat trial so all the kit and install are free

Good idea

Very hard water area - wreaks havoc with everything wet in the home

Something fairly key I missed on saying is that we are near joining the OVO Heat Trial where we will be getting all this kit fitted FOC. Makes a difference to the man maths.

We are on Octpus Agile tariff which over the year is giving as 5p/kWh for the cheapest 4 hr period and 10.5p for all periods except 4pm-7pm. I suppose we could ramp the ASHP right down 4-7 so that we dont get hit from the 35p/kWh charges?

I suspect we would run the ASHP all day in future and just vary temps at night and middle of day. To some degree our switch from heating only for an hour in the morning and 4 hours evening means we dont have much energy stored in our house fabric, but I am noticing the more we have the heating on (Uni kids back at moment) the less cold it gets at night after 9pm.

The tank needs replacing anyway, so that would be £1500 plus fitting. Keeping one eye on the future I strongly suspect over the next 10 years gas is likely to become more expensive (due to carbon disincentives) and electricity better value. When is right to make the switch if not now, that I assume is the question...???

Hi all We are planning a Air Source Heat Pump for our yr.2000 4 bed detached house in SE UK. The rough installer plan is for a c.8.5kW ASHP (Ecodan) with a UVC and low temp radiators. We are waiting to see the exact spec and brands/models for all the parts, as at early stage at the moment. Would replace a 28kW Worcester Bosch A rated boiler (5 yrs old) and Megaflo mains pressure 170l tank. Very rough heat loss calc produced, more detailed one to come. House is c.130sqm internal floor area. We have over the past week used 400kWh heating our home, average 18.5-19 deg C at stat but 22 deg C in living room from 0600-2100 hrs (15 hours per day roughly). Over the past day (15 hours) at zero C outside we used 100kWh gas. The boiler has been working quite hard all day yesterday. On other slightly less cold days we have been using c.85kWh gas per day. We have ordered new triple glazing (U=0.9) and doors which will be installed 1 March, replacing 1999 double glazing (assumed U=3.1, and very poor quality developer installed windows). Q: at this peak winter energy usage does 8.5kW ASHP sound up to the job? Or is it more an issue of the size of the radiators and model/spec? I think the existing windows and doors are so poor and leaky that a lot of heat is being lost from those rather than general leakage in the house fabric. We don't have any insulation (that I am aware of) in the block and beam floor but then mostly wood and carpet and floors don't feel especially cold. Walls are 300mm thick and cavity insulated. Loft now has 300mm insulation but two bath fans are weak spots that I should really address. Thanks in advance!