UPDATED: Air Source Heat Pumps/Air Con - Full Info & Guide, is it cheaper to run than mains gas?

GGSid

Oh it's maybe an edge case example - I'm looking at air 2 air, so typically slightly better than air 2 water for some reason. 
Daikin standard units in the smaller sizes are listed at SCOP 5.10 that's what I'm looking to install at moment hence the number in my head. 
Let's not get into the weeds on the calculation it was an e.g. 

For a resistive electric heater it's really not much different to heating with oil unless you have solar or wind, or maybe if you live in Scotland.

For a heat pump it's in the order of a 60-80% reduction in CO2 emissions relative to oil depending on the model outside temp etc. That's really where I was going.

danrv

Gerry1 said:

danrv said:

New storage heaters would need E7 wiring installed.

Nope.  Dimplex Quantum can be programmed to run from a 24h circuit: all consumption on E7 is at cheap rate during the relevant period(s).  Just make absolutely sure that they're slaved correctly to the meter's actual hours, and remember that radio teleswitch times can vary by +/- 15 minutes.

Thanks. I think new wiring would need to be installed whether it’s E7 or 24hr. The need for chasing the walls is the main problem here and I’d need to put everything in storage.
Maybe same goes for an air to air multi split system install with power required for each indoor unit.

danrv

richardc1983 said:

If you have mains gas go with a condensing boiler. If you don't and electricity is your only option then go with an air to air heat pump system as you say this will give you the most control. A multi-split system you can have as many as 6 indoor room units connected to 1 outdoor unit so it leaves the outside looking neat and tidy. Look at the LG systems which are a good all-rounder in value and function. 

Thanks. The LG systems look good. The sums and running costs in your article are useful too.
There’s no gas/access to gas in my area and the close has a mixture of non gas heating.
There’s oil, electric rads, ASHP, storage heaters, electric under floor and my warm air system.
A wet system would add value but don’t want to install oil fired with the zero carbon thing in progress.
I’ve narrowed it down to air to air heat pump or Quantum storage heaters. Not sure how they compare in running costs but each has individual room control.
For electric only, these are my options.
The house needs redecorating plus some new carpets and the heating has to be done post decoration.

richardc1983

Storage heaters are hard to control. The air to air will give you cooling in the summer which with our increasing warm climates and insulated homes is needed. 

richardc1983

danrv said:

Gerry1 said:

danrv said:

New storage heaters would need E7 

Thanks. I think new wiring would need to be installed whether it’s E7 or 24hr. The need for chasing the walls is the main problem here and I’d need to put everything in storage.
Maybe same goes for an air to air multi split system install with power required for each indoor unit.

Air to air multi systems take their power from the outdoor unit. So you only need power to the outdoor then a power cable comes to each indoor unit along with the refrigerant lines. So you don't need separate power. 

danrv

richardc1983 said:.

Air to air multi systems take their power from the outdoor unit. So you only need power to the outdoor then a power cable comes to each indoor unit along with the refrigerant lines. So you don't need separate power. 

Ok thanks, didn’t realize. 
Not sure how the pipes and cables are installed. I’ve seen demo diagrams of air to air systems showing the indoor units neatly mounted but not connected.
I assume it would be similar to surface mounted piping in a CH radiator system.

Also was wondering what power is needed for a
multi split system with say, six indoor units.
Plus, as it’s air to air, hot water would probably have to be seperate. 
At the moment I use an immersion tank on E10 cheap rate. The unit price though is about the same as a normal tariff.

Was going to get a meter change to E7 for storage heaters but now with a change of plan to ASHP, I’ll just heat the water on normal rate.
Expensive way of doing it but it heats up very quickly.

Scwgrahame

Hi, 
Looking for some advice please. Looking at upgrading heating to an ASHP. I had a company round quoting me 16k for a 3 bed detached house. Seems quite steep but was impressed with the company and they did offer good finance options. Can anyone advise on a few good companies please? I would need one that offers finance, sound warrenty and maintenance and generally some good reviews!
Thanks

Cardew

Scwgrahame said:

Hi, 
Looking for some advice please. Looking at upgrading heating to an ASHP. I had a company round quoting me 16k for a 3 bed detached house. Seems quite steep but was impressed with the company and they did offer good finance options. Can anyone advise on a few good companies please? I would need one that offers finance, sound warrenty and maintenance and generally some good reviews!
Thanks

According to Energy Saving Trust that is about double the typical cost for an ASHP installation. see: https://energysavingtrust.org.uk/advice/air-source-heat-pumps/

What is your present heating system?

Why is an ASHP an upgraded heating system - the running costs are more than gas or oil - even if you get a good installation.

Does your house meet the insulation standards for RHI payments?

What do you expect from a 'sound warranty'?

Scwgrahame

I have a mains gas central heating system at the moment. To replace that will most likely cost in excess of 5k so was looking at alternatives and the ASHP caught my eye. I read that it can save money and of course there is a green aspect to it also.
Like any big purchases though I need to shop around so was just looking for anyone on here who could recommend. 

Gerry1

Scwgrahame said:

I have a mains gas central heating system at the moment. To replace that will most likely cost in excess of 5k so was looking at alternatives and the ASHP caught my eye.

Scwgrahame said:

 Looking at upgrading heating to an ASHP. I had a company round quoting me 16k for a 3 bed detached house

You'd rather pay £16k than a bit more than £5k, for a system that will probably cost twice as much to run and take far longer to warm up?

Does that include the cost of having the much bigger radiators that will be needed?