ASHP yearly review 2023

MultiFuelBurner

I hadn't had time to review last year properly and generally it was a mild year looking at our weather records in the East of England.

We used a total of 3851kWh on heating and hot water for the whole of 2023.

That equates to an average 10.55kwh a day

Our EPC suggests we need a combined 11,928kwh for central heating and to heat the hot water. Estimated 170m2 EPC B.

That gives an overall cop of 3.1

Strummer22

Not bad. I guess given you estimated COP from your EPC that the heat pump doesn't display heat output or COP itself?

In 2023 my GSHP used ~4,000 kWh of electricity on heating and hot water in 2023. According to its display this generated about 20,000 kWh of heat with a COP of 5. 

According to the EPC the heat demand is just over 30,000 kWh, we use less as we only heat to 18.5C.

As an aside, why do EPCs rate heat pumps as 'poor'? From my EPC:

Features in this property

Features get a rating from very good to very poor, based on how energy efficient they are. 

Feature	Description	Rating
Main heating	Ground source heat pump, radiators, electric	Poor

MultiFuelBurner

Strummer22 said:

Not bad. I guess given you estimated COP from your EPC that the heat pump doesn't display heat output or COP itself?

In 2023 my GSHP used ~4,000 kWh of electricity on heating and hot water in 2023. According to its display this generated about 20,000 kWh of heat with a COP of 5. 

According to the EPC the heat demand is just over 30,000 kWh, I guess as we only heat to 18.5C.

As an aside, why do EPCs rate heat pumps as 'poor'? From my EPC:

Features in this property

Features get a rating from very good to very poor, based on how energy efficient they are. 

Feature	Description	Rating
Main heating	Ground source heat pump, radiators, electric	Poor

You are correct no monitoring I just know our baseline usage and extrapolate from there.

That cop is superb

I should add we heated the property to 21/22oC for 2023 that's also very good info for those looking in so thanks for sharing yours 👍

As for EPC's when was yours performed. Ours is 2016 received a good and I have heard they know get a very good status for heating and hot water. Or they should.

Strummer22

MultiFuelBurner said:

That cop is superb

I should add we heated the property to 21/22oC for 2023 that's also very good info for those looking in so thanks for sharing yours 👍

As for EPC's when was yours performed. Ours is 2016 received a good and I have heard they know get a very good status for heating and hot water. Or they should.

I spent some time tweaking the settings to improve the COP. E.g. heating on for longer with the weather compensation curve turned down setting a schedule so that the heat pump only heats the DHW/central heating buffer tank when the water is going to be used so it doesn't sit in the tank slowly cooling down.

With a GSHP there's no need to try and time heating DHW at the warmest time of day as you might with an ASHP. 

The EPC is from March 22. This link lists some reasons why EPCs aren't suitable for assessing the performance of heat pumps: https://www.elmhurstenergy.co.uk/blog/2022/07/04/why-does-my-epc-not-recommend-a-heat-pump/

I can't imagine why an EPC from 2016 would rate a heat pump 'good' and one from 2022 would rate it 'poor', I don't think anything about the methodology would have changed so maybe it's just being implemented inconsistently? 

Reed_Richards

Strummer22 said:

The EPC is from March 22. This link lists some reasons why EPCs aren't suitable for assessing the performance of heat pumps: https://www.elmhurstenergy.co.uk/blog/2022/07/04/why-does-my-epc-not-recommend-a-heat-pump/

The EPC rating of heat pumps was reviewed last year.  The only indication that I can find that tnis review produced a positive outcome is here: https://completeepc.co.uk/better-epc-rating-with-an-air-source-heat-pump/

Reed_Richards

MultiFuelBurner said:

I hadn't had time to review last year properly and generally it was a mild year looking at our weather records in the East of England.

We used a total of 3851kWh on heating and hot water for the whole of 2023.

That equates to an average 10.55kwh a day

Our EPC suggests we need a combined 11,928kwh for central heating and to heat the hot water. Estimated 170m2 EPC B.

That gives an overall cop of 3.1

I used a total of 5115 kWh on heating and hot water for the whole of 2023. 

Our EPC suggest we need a combined 18887 kWh for central heating and hot water .  Estimated 167 m2 EPC B

That gives an overall COP of 3.7 (but this is artificially boosted because my hot water demand, estimated 2987 kWh, is part-met from solar/immersion heater).  My heat pump gives no indication of actual COP/SCOP.

MultiFuelBurner

Strummer22 said:

MultiFuelBurner said:

That cop is superb

I should add we heated the property to 21/22oC for 2023 that's also very good info for those looking in so thanks for sharing yours 👍

As for EPC's when was yours performed. Ours is 2016 received a good and I have heard they know get a very good status for heating and hot water. Or they should.

I spent some time tweaking the settings to improve the COP. E.g. heating on for longer with the weather compensation curve turned down setting a schedule so that the heat pump only heats the DHW/central heating buffer tank when the water is going to be used so it doesn't sit in the tank slowly cooling down.

With a GSHP there's no need to try and time heating DHW at the warmest time of day as you might with an ASHP. 

The EPC is from March 22. This link lists some reasons why EPCs aren't suitable for assessing the performance of heat pumps: https://www.elmhurstenergy.co.uk/blog/2022/07/04/why-does-my-epc-not-recommend-a-heat-pump/

I can't imagine why an EPC from 2016 would rate a heat pump 'good' and one from 2022 would rate it 'poor', I don't think anything about the methodology would have changed so maybe it's just being implemented inconsistently? 

EPC's are consistently inconsistent

Patrol

Strummer22 said:

As an aside, why do EPCs rate heat pumps as 'poor'? From my EPC:

Features in this property

Features get a rating from very good to very poor, based on how energy efficient they are. 

Feature	Description	Rating
Main heating	Ground source heat pump, radiators, electric	Poor

Maybe it's down to the combination of heat pump and radiators, do you not get the chance to ask why a particular rating was given

Rolandtheroadie

We used 5202, heat loss was over 15k, but can't remember the exact figure. 
 Happy with the usage.