Air source heat pumps

[Penninetrader]

I have an 11kw Mitsubishi ecodan. Eight years old so not as quiet as modern ones.

What sort of running costs do you have and what are the maintenance costs. Please exclude any solar panel subsidy from the calcs. What sort of property and insulation etc. Real world info helps people make informed pragmatic choices. Any investment has to be done open eyed and informed so your info and that of others would be helpful in this regard

 

[enrico]

What sort of running costs do you have and what are the maintenance costs. Please exclude any solar panel subsidy from the calcs. What sort of property and insulation etc. Real world info helps people make informed pragmatic choices. Any investment has to be done open eyed and informed so your info and that of others would be helpful in this regard

It costs me £200 a year for a service but once our if warranty it is hardly worth it.
My house is solid wall built on 1850. Good insulation and double glazing. Underfloor heating in main large lounge and radiators everywhere else.
Running costs differ from day to day but anything between 10 kw to 50 kW on a really cold day. Cost is dependant on your tariff. I use octopus cosy tariff which gives me three lots of hours totalling 8 at 12 p per kW .

 

[Penninetrader]

It costs me £200 a year for a service but once our if warranty it is hardly worth it.
My house is solid wall built on 1850. Good insulation and double glazing. Underfloor heating in main large lounge and radiators everywhere else.
Running costs differ from day to day but anything between 10 kw to 50 kW on a really cold day. Cost is dependant on your tariff. I use octopus cosy tariff which gives me three lots of hours totalling 8 at 12 p per kW .

How are you achieving the insulation on your solid walls ?

 

[enrico]

How are you achieving the insulation on your solid walls ?

Downstairs is a foot thick so don't need it. Upstairs is partly double brick with no cavity. Used internal insulated plasterboard where necessary. A large section is cladding with insulation.

 

[simonwig]

What sort of running costs do you have and what are the maintenance costs. Please exclude any solar panel subsidy from the calcs. What sort of property and insulation etc. Real world info helps people make informed pragmatic choices. Any investment has to be done open eyed and informed so your info and that of others would be helpful in this regard

I can’t comment on living with an ASHP, but am going through the process of getting one.

I ended up going with Heat Geek, there’s a free estimate on their website - but that’s what it is, an estimate, but actually quite accurate in my case. They also appear to have a good rep in the various forums. Renew the heating industry - HeatGeek Also lots of really useful info on their website and YouTube.

A proper design will cost £375, deductible against purchase.

Their ‘group’ of independent engineers are backed by a performance guarantee, which is encouraging.

I’ve got an 1840s 600mm thick stone walled listed building, so wall insulation is impractical, impossible, unless you pay a fortune for something like aerogel. However it is not essential, it’s about the things you can do, roof, floor, windows to improve what you can..

My design, just received, means some radiator upgrades, but has a 400% SCOP. It’s not cheap, but we’re on oil, so there is a payback,.

Estimated running costs, £750 per year compared to over twice that on oil.

Now just to go through planning.

Good luck

Simon

 

[Penninetrader]

I can’t comment on living with an ASHP, but am going through the process of getting one.

I ended up going with Heat Geek, there’s a free estimate on their website - but that’s what it is, an estimate, but actually quite accurate in my case. They also appear to have a good rep in the various forums. Renew the heating industry - HeatGeek Also lots of really useful info on their website and YouTube.

A proper design will cost £375, deductible against purchase.

Their ‘group’ of independent engineers are backed by a performance guarantee, which is encouraging.

I’ve got an 1840s 600mm thick stone walled listed building, so wall insulation is impractical, impossible, unless you pay a fortune for something like aerogel. However it is not essential, it’s about the things you can do, roof, floor, windows to improve what you can..

My design, just received, means some radiator upgrades, but has a 400% SCOP. It’s not cheap, but we’re on oil, so there is a payback,.

Estimated running costs, £750 per year compared to over twice that on oil.

Now just to go through planning.

Good luck

Simon

That 750 sounds very low, is there some other factor ? The insulation details for all these installations would I believe prove helpful

 

[simonwig]

That 750 sounds very low, is there some other factor ? The insulation details for all these installations would I believe prove helpful

Based on using Octopus cosy, 120sq metre property, small part modern extension, rest as above, EPC E.

Uses Weather Compensation, which seems critical for all I've read, to control the temperature for the flow, ie if it's warm(ish) outside, say 10C, the flow temp is lower than when it's colder , so more efficient.

Simon

 

[Newbeeneil]

Based on using Octopus cosy, 120sq metre property, small part modern extension, rest as above, EPC E.

Uses Weather Compensation, which seems critical for all I've read, to control the temperature for the flow, ie if it's warm(ish) outside, say 10C, the flow temp is lower than when it's colder , so more efficient.

Simon

I agree with Penninetrader that does sound extremely low for a house of that size. I am surprised your getting 400% out of a house with a EPC of E.
I only get 340% with an EPC of D.

 

[Newbeeneil]

What sort of running costs do you have and what are the maintenance costs. Please exclude any solar panel subsidy from the calcs. What sort of property and insulation etc. Real world info helps people make informed pragmatic choices. Any investment has to be done open eyed and informed so your info and that of others would be helpful in this regard

My electricity use is approx 5500kwh
The 120m2 semidetached house has underfloor insulation and heating on the ground floor.
Blown insulation in the walls and 300mm of insulation in the loft.
I have radiators on the first floor.
I do have PV but of course heat pumps don’t tend to use much PV as the heating is normally needed during periods of low light.
When I decided to install the system running costs were similar to gas which I could have installed.
Regarding maintenance, I’ve never had it serviced in the 10 years it’s been running but I have cleaned the filters and had to replace the hot water pressure tank and a pump.

 

[Penninetrader]

My electricity use is approx 5500kwh
The 120m2 semidetached house has underfloor insulation and heating on the ground floor.
Blown insulation in the walls and 300mm of insulation in the loft.
I have radiators on the first floor.
I do have PV but of course heat pumps don’t tend to use much PV as the heating is normally needed during periods of low light.
When I decided to install the system running costs were similar to gas which I could have installed.
Regarding maintenance, I’ve never had it serviced in the 10 years it’s been running but I have cleaned the filters and had to replace the hot water pressure tank and a pump.

That sounds pretty good, I suppose the devil is in the detail, average Temps and the hours heated plus hot water consumption etc. What surprises me is the low D rating for a quite well insulated property with PV and a heat pump.

 

[Penninetrader]

Based on using Octopus cosy, 120sq metre property, small part modern extension, rest as above, EPC E.

Uses Weather Compensation, which seems critical for all I've read, to control the temperature for the flow, ie if it's warm(ish) outside, say 10C, the flow temp is lower than when it's colder , so more efficient.

Simon

It will be interesting to see how it goes in the real world

 

[Newbeeneil]

That sounds pretty good, I suppose the devil is in the detail, average Temps and the hours heated plus hot water consumption etc. What surprises me is the low D rating for a quite well insulated property with PV and a heat pump.

Yes the D rating was a surprise to me but I think the assessor was a bit of a w****r as he seems to have forgotten the floor insulation and the PV was added later.
I wasn’t worried as I only needed to achieve a D to get RHI for installation of the heat pump.