Adding Rads, would boiler be man enough?

[R.Oak]

Hi guys, im working in a property and have been asked if its possible to add two extra radiators. The property currently has 10 radiators and two towel rails, all off the heating. It has two radiators downstairs, 8 rads and two towel rails on the first floor. The customer would like two radiators added to the second floor.

The boiler is in the middle of the first floor. The first floor rads are all fed from under the floorboards with the exception of one which has 15mm F+R which run up into the attic, across and then back down. Id like to T of these 15's and add two rads upstairs.

The boiler is a Vaillant System Boiler, 28KW. Do you think this would be man enough?

Thanks

 

[stevetheplumber]

if the rads are normal sized domestic s the boiler will be big enough whether the 15mm pipes will run three rads will depend on the sizes but generally i would say yes it will work

 

[R.Oak]

thanks, the rads are generally all domestic ones. the are a couple of larger ones. I might upgrade the upright to 22mm and then branch off in 15mm

 

[Neil K]

thanks, the rads are generally all domestic ones. the are a couple of larger ones. I might upgrade the upright to 22mm and then branch off in 15mm

If you do that then you should be ok

 

[AWheating]

15mm can cope with upto around 6kw (upto 9kw on a modern boiler with a 20 degree diff), but long runs should be avoided due to increased flow restriction and noise. upgrading to 22mm may have benifits.

 

[R.Oak]

Its about a 10 meter run to the end radiator after its has gone up into the loft. Ill probable go up in 22, branch in 15 to the drop on one side and then run 22 to the first rad on the other side. That should be ok shouldnt it?

 

[stevetheplumber]

i would go to first pair of tees in 22 then 15