Adding an additional rad

[LfcDom11]

Good morning.

Im hoping to add an additional 600 x 500 rad into my kitchen. The only pipes that I can get near to are the ones that are currently feeding a 600 x 1400 rad in the room next door.

I was hoping that these pipes were running in 22 above ceiling and dropping down in 10mm, however they are running in 10mm all the way back to the landing (major disruption to alter this)

Is there anyway the 10mm drop could be adapted to 15mm and then feed the existing rad + the new one?

It’s a gravity fed system, currently has 7 rads on it.

Thank you

 

[Exedon]

Not much point altering the drops to 15mm without taking them right back to wherever they start. Is your 10mm a manifold system or reduced tees?
Is existing rad a double or single.
I assume you have a tank feed system?

 

[LfcDom11]

It reduces to 10mm in a manifold. The existing rad is a double, but ironically doesn’t really get used too much as there’s a stove in that room, however the new one would be on all the time the heatings on. Yes it’s a tank fed system.

 

[denso13]

Is there anyway the 10mm drop could be adapted to 15mm and then feed the existing rad + the new one?

Have done it a few times when stuck and has worked ok.

 

[Madrab]

Taking it that there may be a need to use both rads full on, which is the standard approach to design, that 10mm feed will be at its limit providing for the 1400mm rad. The 10mm can be increased to 15mm but it won't take away from the fact that the large rad has maxed out the pipe carrying capacity of the 10mm feeds as it is.

A 6x14 K2rad with a 50deg delta will output approx 2.5kw, a 10mm copper pipe @1.5m/s max water velocity @ 70deg can carry about the same 2.5kw. Pipe run lengths and heat loss not withstanding. Adding in an extra 900W onto that, that 10mm feed will struggle.