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Concerned about running costs for our 2019 ASHP

 
Air Source Heat Pumps (ASHPs)
Last Post by Brendon Uys 5 years ago
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 Caroline2000
(@caroline2000)
Active Member Member
Joined: 5 years ago
Posts: 11
Topic starter 27/10/2021 8:37 pm   [#203]

Hi all,

we have an ASHP - fitted May 2019 (previously Gas, heating via warm air ducted heating)

We did a full renovation and opted for ASHP (partner works in oil & gas and felt that this was best way forward!)

We get the RHI - thankfully!

But we are using between 18 and 22 thousand KWh each year......it’s costing a fortune.....

We have underfloor heating downstairs and oversized radiators upstairs......

Any ideas to make the house warmer and reduce the costs would be helpful/welcome!



   
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Mars
 Mars
(@editor)
Illustrious Member Admin
Joined: 5 years ago
Posts: 4590
27/10/2021 9:27 pm  

@caroline2000 we’re all facing an expensive winter this year with tariffs that are sky high. The only way to reduce costs is to drop the flow rate temperature. We dropped ours from 45C to 40C and have seen our COP rise to over 3 from our 2.7. This means we’re running more efficiently and using less electricity.

Is the insulation in your house good?


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 Caroline2000
(@caroline2000)
Active Member Member
Joined: 5 years ago
Posts: 11
Topic starter 27/10/2021 11:12 pm  

Thanks......it was expensive before the rise in electricity costs!

Supplier has gone bust but at least covered by energy cap which is something!

Downstairs is suspended floor; but as insulation between joists held by ‘baskets’....advised by installer, then wet underfloor heating. 

Insulation for roof is all new so I’m hoping is good!

Walls.....not sure.....some are the existing walls of old house (built around 1965), other new walls have up to scratch insulation so again hopeful this would be enough.

Looking to get external render done (need to save up some cash) - hopeful this may help with improving insulation?

We’ve not hot heating on at the moment as we needed to fix some tiling so need to keep it off.....surviving with biomass fire!

On a positive at least this is saving us some money......

Once back on I’ll make sure flow rate temp is as low as it can be.

Biggest issue seems to be that we can’t seem to get the house warm......even when spending a fortune!



   
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 Brendon Uys
(@heacol)
Prominent Member Contributor
Joined: 5 years ago
Posts: 415
27/10/2021 11:32 pm  

@caroline2000 It is usually quite simple to correct the installation. Firstly I would need some information.

What is the make and model of your heat pump?

Do you have system seperation or a 4 pipe buffer?

Do you habe pumps and blending valves on your manifolds?

Is your under floor heating zoned to heat each room at a different temperature?

Unless the house is lealing and very drafty, adding external wall insulation and any more than 200mm of loft insulation is a wast of money and you will not see a return.

Your flow temperature at this time of year should be arround 25 Geg C, if you are running it at 40-45  that is where you problem is.

We have installed heat pumps in large solid stone houses with single glazing with heating bills of under £1000.00 a year (+-14p/kwhr)



   
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