Air source heat pump vs gas heating?

anon_ymous

Exiled_Tyke said:

waqasahmed said:

mickyduck55 said:

Depends on the rest of your "systems".. I have solar and batteries and have been using my Air to Air AC /ASHP .. certainly saving me money but only because my electricity is inexpensive.
If its a stand alone ASHP as above probably not 

I intend on getting solar panels anyway tbh. If I have both, would I expect it to be cheaper than gas heating? 

I think that is very much 'how long is a piece of string' type question. There are so many variables to consider e.g. are you at home during the day?  Do bear in mind that solar performs at its best at the wrong time of day and the wrong time of year for most people's heating requirements.  My friend I mentioned above said it's costing him in winter but that's not his primary reason for doing it. 

That's fair. I understand that some are doing it because it's greener and some are sorta forced to do it if they're renting out bills inclusive HMOs that need to improve their efficiency

I wfh three / five days and I'll get lodgers too so it's likely that the house will be in use so to speak throughout the days and nights

I get quite cold at night so I'd only want AC to cool you down, and for most of the year, fans are perfectly fine for that 

arty688

i'm certain my ASHP has cost a lot more than gas CH would have, but for me gas wasn't an option and neither was oil or LPG. So my choice was electric or electric.
Hence the ASHP was the best form of electric heating at the time plus it cost me about £5K which I got back via RHI which has now finished.

ispookie666

ASHP including Air - Air will be eligible for 5% VAT reduction.  

ed110220

The best air-to-air heat pumps aka split air conditioners seem to have seasonal COPs (SCOP) of 5.2. So on paper, with current prices of electricity at 28.4p/kWh heating will be 5.5p/kWh.

Gas at 7.5p/kWh and a typical condensing boiling efficiency of 90% gives the cost of heat as 8.3p/kWh.

Of course an air-to-air unit doesn't provide hot water so it's not a direct replacement but for space heating it should be cheaper to run.

Reed_Richards

ed110220 said:

The best air-to-air heat pumps aka split air conditioners seem to have seasonal COPs (SCOP) of 5.2. So on paper, with current prices of electricity at 28.4p/kWh heating will be 5.5p/kWh.

Gas at 7.5p/kWh and a typical condensing boiling efficiency of 90% gives the cost of heat as 8.3p/kWh.

Of course an air-to-air unit doesn't provide hot water so it's not a direct replacement but for space heating it should be cheaper to run.

If the seasonal CoP is 5.2 then it will be better than that in spring and autumn and worse in winter.  In spring and autumn you will have more solar power so the cost of your electricity may just be what you don't get paid for exporting it.  If so then I think @Martyn1981 had the better estimate of 1.25 p/kWh - but this is achieved by keeping your gas heating and not using the air-to-air heat pump in winter. 

anon_ymous

ed110220 said:

The best air-to-air heat pumps aka split air conditioners seem to have seasonal COPs (SCOP) of 5.2. So on paper, with current prices of electricity at 28.4p/kWh heating will be 5.5p/kWh.

Gas at 7.5p/kWh and a typical condensing boiling efficiency of 90% gives the cost of heat as 8.3p/kWh.

Of course an air-to-air unit doesn't provide hot water so it's not a direct replacement but for space heating it should be cheaper to run.

Would that be the case even with a brand new boiler? 

ed110220

waqasahmed said:

ed110220 said:

The best air-to-air heat pumps aka split air conditioners seem to have seasonal COPs (SCOP) of 5.2. So on paper, with current prices of electricity at 28.4p/kWh heating will be 5.5p/kWh.

Gas at 7.5p/kWh and a typical condensing boiling efficiency of 90% gives the cost of heat as 8.3p/kWh.

Of course an air-to-air unit doesn't provide hot water so it's not a direct replacement but for space heating it should be cheaper to run.

Would that be the case even with a brand new boiler? 

Would what be the case? (Almost) all domestic boilers provide hot water (ie from the taps for washing etc) as well as for space heating.

anon_ymous

ed110220 said:

waqasahmed said:

ed110220 said:

The best air-to-air heat pumps aka split air conditioners seem to have seasonal COPs (SCOP) of 5.2. So on paper, with current prices of electricity at 28.4p/kWh heating will be 5.5p/kWh.

Gas at 7.5p/kWh and a typical condensing boiling efficiency of 90% gives the cost of heat as 8.3p/kWh.

Of course an air-to-air unit doesn't provide hot water so it's not a direct replacement but for space heating it should be cheaper to run.

Would that be the case even with a brand new boiler? 

Would what be the case? (Almost) all domestic boilers provide hot water (ie from the taps for washing etc) as well as for space heating.

Apologies. The heat pump being cheaper to run for space heating than the gas boiler 

Screwdriva

waqasahmed said:

I intend on getting solar panels anyway tbh. If I have both, would I expect it to be cheaper than gas heating? 

Solar PV is a wise investment. That said, solar generation is very low in the months of Dec/ Jan/ Feb, which is when Air Source heat pumps are running. Solar will help but it shines for the 9 months of the year ASHPs are under minimal strain.