Energy Performance Certificates and Heat demand
Hi Jenny,
If I was considering an ASHP installation I would be looking at the following criteria and asking the relevant questions.
ASHP :-
What is the predicted Coefficient of Performance (COP) at the various ambient air temperatures +10C, +5C, 0C, -5C and -10C, or for a performance graph covering that range of temperatures. This will allow comparison of the efficiency of each ASHP against the other brands. This is also important to ensure that the correct size ASHP is selected for your particular situation. You state that you often experience temperatures of -10C, so you need an ASHP that will provide sufficient energy to fully meet your heat loss and total heat demand at this ambient temperature.
Does the heat pump compressor run at constant speed or does it have a variable speed drive? Variable speed drives are claimed to be more efficient and help reduce energy consumption.
What is the cost of the ASHP?
What is the manufacturer's specified Mean Time Between Failure (MTBF) for the selected ASHP? This is a measure of the anticipated reliability.
What is the manufacturer's warranty period and what if anything is excluded?
What after sales service is provided by the manufacturer?
Approximately how many of their ASHP's have been installed in the UK?
Designer/Installer :-
Why have they specified a particular manufacture of ASHP?
Show detailed information of how they arrived at the size of ASHP required for your property?
How many installations have they performed?
What warranty period and level do they provide?
What after sales service do they provide and at what cost?
Are they MCS registered and for how long?
What level of spares for your particular ASHP do they carry?
What is the cost of installation with an itemised breakdown?
Do they have any satisfied customer's with whom you could speak?
How long will installation take and what level of disruption is to be expected?
Obviously there are other questions that you or others may think of but I think the above covers many of the important issues.
If you would like clarification of any point then please get in touch.
@derek-m Thank you for your detailed reply. I can see that I need to carry on with my research for a while longer!
@derek-m, that's a terrific check list - very detailed, and very helpful for others to work through.
Buy Bodge Buster – Homeowner Air Source Heat Pump Installation Guide: https://amzn.to/3NVndlU
From Zero to Heat Pump Hero: https://amzn.to/4bWkPFb
Subscribe and follow our Homeowners’ Q&A heat pump podcast
Hi Jenny,
I have thought of some additional criteria, which although not essential are indeed desirable.
Does the ASHP system have any form of weather compensation, and if so, how does it function. There are two main aspects which affect the efficiency with which an ASHP operates. One is the ambient air temperature, since below approximately +5C the ASHP has to work harder to extract the same amount of energy from the ambient air. The other is how warm the central heating water needs to be heated by the ASHP, the warmer the water, the harder the ASHP needs to work. Correctly optimised weather compensation, should lower the central heating water temperature, particularly during the Spring, Summer and Autumn periods, to just meet the required heat demand. In this way the ASHP operates at maximum efficiency. If weather compensation is not available, then how easy is it for the end user to change the setting of the desired central heating water temperature?
Another desirable capability would be for the system to provide monitoring of energy consumption and operating parameters, particularly historical data so that operational performance can be assessed and optimised where necessary.
Thanks JonnyD, it is always useful to get feedback, so that we can try to ensure that information is relevant and meaningful.
A further thought that I have had, is to ensure that the control system (thermostats, TRV's etc), provides the most efficient control and operation of your system, without adding unnecessary complication.
-
Help needed in Essex
2 months ago
-
Air source heat pump problems - NIBE F 2040 ASHP
6 months ago
-
Viessmann Vitocal 250-A in the UK
1 year ago
-
Underfloor heating specification for heat pump
2 years ago
-
2 heat pumps - 1 as a slave
2 years ago
- 22 Forums
- 2,084 Topics
- 46 K Posts
- 14 Online
- 3,378 Members
Join Us!
Trusted Installers
Struggling to find a reliable heat pump installer? A poor installation can lead to inefficiencies and high running costs. We now connect homeowners with top-rated installers who deliver quality work and excellent service.
✅ Verified, trusted & experienced installers
✅ Nationwide coverage expanding
✅ Special offers available
Latest Posts
-
RE: Mitsubishi Ecodan Fails to Heat Water despite temperature drop
Hi @m1kegibson Maybe a long shot but is the controll...
By RobS , 9 hours ago
-
Good question and you’re not wrong to question the term...
By Mars , 10 hours ago
-
RE: Renewables & Heat Pumps in the News
Yes I realise I'm picking this up a week late...... but...
By Transparent , 19 hours ago
-
@editor Mars if you have any recommendations for down s...
By abam48 , 1 day ago
-
RE: Surface mount or bury primaries for heat pump installation?
@tomasmcguinness HI, The rules is a best practise, the ...
By ASHP-BOBBA , 1 day ago
-
RE: Vaillant AroTherm Plus 7kW
@scalextrix if your under unit heater is like our Myson...
By Judith , 2 days ago
-
RE: Getting the best out of a heat pump - is Homely a possible answer?
@cathoderay how did you get a script to run for that- d...
By benson , 2 days ago
-
RE: Renewable Heating Hub Homeowners' Q&A Podcast
@ashp-bobba thank you, and equally so, thank you for ta...
By Mars , 3 days ago
-
@judith good to know… I’ll continue to feed Wattson, an...
By Mars , 3 days ago
-
RE: My misgivings about installing ASHP and solar panels via the ECO4 scheme...
@editor great article re accreditation. I note ISO/IEC ...
By Bart , 4 days ago
-
RE: Who's your electricity provider and what's your tariff?
I don't (yet), but my PW3 is due to be installed shortl...
By Old_Scientist , 5 days ago
-
RE: MCS and NAPIT complaints process
@chrislay, is your heat pump complaint still unresolved...
By Mars , 5 days ago
-
RE: ASHP Install from hell - help please
@saf1973 I’ve been going through old cases on the forum...
By Mars , 5 days ago
-
RE: RDSAP10 effect on existing heat pump EPC rating?
@aaron There's the rub, the database does not list my ...
By AF1 , 5 days ago
-
RE: Commencing on an ASHP Installation Process
Yes, it's "doable" if everything goes to plan, they arr...
By Old_Scientist , 7 days ago
-
RE: How not to install a heat pump
You are right. Thinking on this has evolved over the p...
By JamesPa , 1 week ago