Using Annual Gas Consumption to understand what an ASHP may consume in electricity
I have a 1920s 4 bed detached house in Surrey and I am thinking of changing to an ASHP. My gas bills show that I use 29,000 kwh per annum of gas - is there an easy way to understand what might be achievable in terms of electricity use from an air source heat pump to achieve the same level of heating? or are there too many other variables?
Hi Nick,
Its more important to understand the current setup of your property in regards to insulation, double/triple glazing, radiators/underfloor heating/pipework etc.
There are a couple of review/threads on the forum where people post their data but every property/installation is different so its hard to compare to your property.
What is pushing you towards looking at an ASHP?
Mitsubishi Ecodan 14kw ASHP + 500l Cylinder
Posted by: @nick-tI have a 1920s 4 bed detached house in Surrey and I am thinking of changing to an ASHP. My gas bills show that I use 29,000 kwh per annum of gas - is there an easy way to understand what might be achievable in terms of electricity use from an air source heat pump to achieve the same level of heating? or are there too many other variables?
If the system is designed and operated properly, you should cut about 20-30% off that.
Director at Heacol | Expert Heat Pump Consultant | Book a one-to-one consultation for pre- and post-installation advice, troubleshooting and system optimisation.
@george . I want to dispense with my gas connection altogether in order to reduce carbon emissions. I understand that the Domestic RHI is ending in March 2022 and the replacement scheme would seem to be a reduction in the value of the incentive for a property my size (flat 5k vs about 10k spread over 7 years).
Posted by: @nick-tI have a 1920s 4 bed detached house in Surrey and I am thinking of changing to an ASHP. My gas bills show that I use 29,000 kwh per annum of gas - is there an easy way to understand what might be achievable in terms of electricity use from an air source heat pump to achieve the same level of heating? or are there too many other variables?
Hi Nick,
Welcome to the forum.
As a very rough, ballpark figure, you could probably expect electrical energy consumption to be 1/4 that of your gas consumption, if you were to fit a well designed, installed and optimised ASHP system.
If your objective is to save the planet and don't mind the additional cost, based on present gas and electricity tariffs, then you are to be commended. If your desire is to help save the planet and also improve your bank balance they it may be best to look at improving the level of insulation first.
@jeff Same thing
Director at Heacol | Expert Heat Pump Consultant | Book a one-to-one consultation for pre- and post-installation advice, troubleshooting and system optimisation.
Posted by: @jeffHave I miss understood
@heacol says 20% to 30% off the gas consumption figure?
@derek-m says 75% off the gas consumption figure?
Hi Jeff,
I think it may be a freudian slip. I do believe Brendon's statement should read ' 20% to 30% of the gas consumption figure', which of course would be approximately the same.
Dependent upon the heat loss of the property, along with the type and size of the heat emitters, a conservative estimate would be a SCOP of 4 for a well designed, installed and optimised system. Without specifics it is impossible to be any more accurate.
@derek-m 😆 👍
Director at Heacol | Expert Heat Pump Consultant | Book a one-to-one consultation for pre- and post-installation advice, troubleshooting and system optimisation.
Thanks - this now makes sense and would bring the cost of electricity to roughly the same ballpark as gas.
I have a few questions on how best to optimise but I will start another thread on that.
As a rough comparison I had 3 quotes in Nov 2020 for:
14Kw Mitsubishi Ecodan pump
250l DHW tank
6 new radiators
MMSP
One came in at £14K and the others (which may have been £1K extra) were willing to match. They all charged £1K for MMSP which was included in the £14K.
Regarding MMSP. although it may sound like it's for geeks I would highly recommend having it installed, especially if you intend registering for RHI as you get it for free effectively.
I'm just going through fine tuning my ASHP on another forum topic and MMSP has been invaluable in identifying how the system is performing and whether action needs to be taken.
It will also allow the installers to remotely access your system if an error can be resolved without an engineer visit.
- 26 Forums
- 2,114 Topics
- 46.4 K Posts
- 28 Online
- 3,410 Members
Join Us!
Latest Posts
-
Delighted to hear this went well. It looks very neat ...
By JamesPa , 2 hours ago
-
RE: No-code, plug-and-play monitoring for your heat pump
The issue with the Grant is that you have to wire direc...
By Grantmethestrength , 6 hours ago
-
RE: Is this just haze or something more?
I am not a scientist nor a meteorologist and I know the...
By Toodles , 6 hours ago
-
RE: Benefits of an extra horizontal loop for GSHP
It will improve performance, but by how much depends on...
By Brendon Uys , 11 hours ago
-
RE: The good, the bad and the not that great – my heat pump installation
Said I would pop back with a update. Only Mr Jesus h...
By Burtis , 1 day ago
-
RE: Buffers, hot water and cooling
Thats presumably heat pump DT, what about radiator DT a...
By JamesPa , 1 day ago
-
RE: Who's your electricity provider and what's your tariff?
@chandykris Exactly the same here. We now have 13.5kWh ...
By Old_Scientist , 1 day ago
-
Compressor and Evaporator Stratification
I have had a few issues with my Hitachi spilt heatpump ...
By trebor12345 , 2 days ago
-
RE: Wood burner with ASHP - direct air?
This depends on the size of your wood burner and size/t...
By Lucia , 2 days ago
-
RE: Difficult positioning of air source heat pump
@rikiarn It's a not a buffer it's a volumiser which is ...
By Lucia , 2 days ago
-
RE: Is your heat pump insured?
To make things clear, lots of insurance companies cover...
By Lucia , 2 days ago
-
RE: Boxt Heat Pump Installation Experience
@adrian any updates since installation? How is it perfo...
By Ashfp , 2 days ago
-
RE: Say hello and introduce yourself
Hi @seatonian - Yes, I know Seaton, and I have the Nat...
By Transparent , 3 days ago
-
@seatonian got your email. Will connect you with a reco...
By Mars , 4 days ago
-
@downfield and @toddles, this isn’t in the settings cur...
By Mars , 6 days ago
-
RE: Homely launched for Grant Aerona ASHP control
I haven't bought the Aerona Smart Controller (£700!) bu...
By Prunus , 6 days ago
-
RE: Antifreeze top up for my heat pump - is this a rip off?
For the record, Grant supply ethylene glycol for their ...
By Prunus , 6 days ago
-
RE: Compressor attempts start but fails - Nibe Fighter 2005 8kW
@skyefarmer amazing. Well done!
By Mars , 7 days ago
-
RE: Air source heat pump roll call – what heat pump brand and model do you have?
Ebac 5kw - Monobloc R32. Developed and made in UK - Mit...
By marcinwloch69@gmail.com , 1 week ago
-
RE: Is a Valliant Inline 6kW heater a BUS buster?
Just another thought - it might be worth thinking about...
By JamesPa , 1 week ago