Advice on ball park radiator sizes please
Posted by: @derek-mI'm afraid that I do not follow your logic, since heat loss is heat loss and is not dictated by the radiator size or type. Different size or type of radiators will merely require a higher or lower water temperature so that the thermal energy output matches the present heat loss.
Sorry, I obviously didn’t explain that very well, and wrong to boot. As you say, the room/house heat loss is fixed and determined by the fabric and outside temperature, etc. the radiators would then be chosen to provide that output at the desired flow temperature and flow rate, again as you state. I was speculating that the values might be for the standard 50C but without checking the actual radiator specifications and so misled myself on the figures, the Stelrad k3 700x2000 for instance looks like it outputs 5424W at delta-t 50 according to the data sheet, which is considerably higher than the values given. Please ignore my mistaken intrusion.
Thank you all - so grateful for your advice.
I went back to the company, and they forwarded my query to another branch (the original person being away for 3 weeks). The person there confirmed there was an error - apparently the original guy had read the wrong column of figures or something...
So I now have a revised set of sizes, which are much closer to what I anticipated:
Room |
Watts required |
Suggested radiator |
Radiator type |
|
|
|
|
|
|
Living room |
|
|
|
UFH |
Shower room |
|
|
|
|
Kitchen |
|
|
|
|
Dining hall |
|
|
|
|
Hall |
|
|
|
|
Landing (1st floor) |
700 |
600x600 |
K2 |
|
Study |
1050 |
600x600 |
K2 |
|
Sitting room |
1600 |
600x1000 |
K2 |
|
Bed 1 |
1500 |
600x1000 |
K2 |
|
Bed 2 |
1600 |
600x1000 |
K2 |
|
Bed 3 |
1550 |
600x1000 |
K2 |
|
Landing (2nd floor |
700 |
600x600 |
K2 |
Somewhat different to the originals!
I would suggest that you ask the company to provide a full set of heat loss calculations for your home. Also ask them to clarify what is meant by 'Watts required' in the table, and to confirm their calculated Leaving Water Temperature (LWT) coming from the heat pump.
- 22 Forums
- 2,096 Topics
- 46.2 K Posts
- 50 Online
- 3,384 Members
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
-
Heat pump solutions and/or installer recommendations for France
I am looking for heat pump solutions for a home I'm buy...
By Bravo4 , 3 hours ago
-
If you are thinking of heating on the immersion conside...
By JamesPa , 7 hours ago
-
RE: Surface mount or bury primaries for heat pump installation?
@tomasmcguinness, I think your best bet would be using ...
By Aventus Eco , 17 hours ago
-
RE: Solar Power Output – Let’s Compare Generation Figures
@toodles all depends on asking the right questions! And...
By Tim441 , 18 hours ago
-
RE: Mitsubishi cycling while on chilled water output
I absolutely wouldn't remove the buffer altogether, I'd...
By JamesPa , 1 day ago
-
RE: Commencing on an ASHP Installation Process
I received confirmation this morning that my Greener Ho...
By Sheriff Fatman , 1 day ago
-
@jamespa Thanks for the advice - very helpful. I had al...
By abam48 , 2 days ago
-
RE: Weather compensated secondary circuits with Biomass
Hi @andycoo we do an LK 110 standalone weather compensa...
By Sune , 2 days ago
-
RE: Adding battery storage to SolarEdge PV system
@chandykris No need to apologise at all! I forgot to ad...
By Toodles , 3 days ago
-
RE: Say hello and introduce yourself
Yes please do Suggesting a loss in the region...
By JamesPa , 3 days ago
-
As I have reported elsewhere we turned on the cooling o...
By downfield , 4 days ago
-
-
@el3b Hi, sorry to hear that, it is advisable to instal...
By ASHP-BOBBA , 5 days ago