single to double radiator concerns

[lognak]

Hi,

I have a Glow Worm Swift Flow 100. As a combi it's delivering HW to the ground floor and 1st floor and all the radiators. I want to change the upstairs raditors from single with fins to double with fins but have been told it's too much for the boiler.
I thought as the radiators aren't being placed any higher and apart from one, are being replaced by a larger dimension that it would be ok.
Is it due to doubling the water volume per radiator thats causing this or is the advise nonsense? (

thanks,
Simon

 

[Armo74]

Why do you want to change them all to doubles?

Are the rooms not reaching temperature?

Are the current radiators sized correctly?

You can do your own calculations on a room by room basis on radcalc.com.

 

[Charnwood]

radcalcS.com

http://www.radcalcs.com/

 

[dcawkwell]

Whoever told you the boiler couldn't do it is a numpty.
Ignore them.