central heating

naylor · Posted: Sun Apr 16, 2006 12:09 pm Post Subject: central heating

just built a two story extention...is it ok to connect to the central heating radiator circiut on the existing upstairs into the new part upstairs then run it down into the new extention downstairs or is it best to go upstairs to upstairs and lower to lower?...does it matter ?..thanks for any replies

croydoncorgi · Posted: Sun Apr 16, 2006 12:22 pm Post Subject:

Bit late in the design process to think about this!

Have you actually checked what pipe sizes run to where?
How many rads in the new bits?

If you connect the new downstairs rads to the upstairs circuit, you may run out of pipe capacity and / or operating pressure, so no heat will get downstairs.

But most 'conventional' heating systems have the pump upstairs, next to the cylinder anyway. Where's yours?

Also, depending on the size of the house, Building Regs demand separate upstairs and downstairs zones. Even if your (enlarged) house is not that big, it might still be a good idea to zone it.

naylor · Posted: Sun Apr 16, 2006 2:25 pm Post Subject:

croydoncorgi wrote:

Bit late in the design process to think about this!

Have you actually checked what pipe sizes run to where?
How many rads in the new bits?

If you connect the new downstairs rads to the upstairs circuit, you may run out of pipe capacity and / or operating pressure, so no heat will get downstairs.

But most 'conventional' heating systems have the pump upstairs, next to the cylinder anyway. Where's yours?

Also, depending on the size of the house, Building Regs demand separate upstairs and downstairs zones. Even if your (enlarged) house is not that big, it might still be a good idea to zone it.

thanks for the reply...there two extra rads upstairs and two down stairs all running on 15mm pipes, a new bigger condenser boiler as been fitted to take the bigger output, ive no cylinder everythings just coming of the boiler.

croydoncorgi · Posted: Sun Apr 16, 2006 3:12 pm Post Subject:

Yes - but what boiler is it? Combi? system boiler? where's the pump? what size of pipe are youb planning to connect TO?

naylor · Posted: Sun Apr 16, 2006 5:25 pm Post Subject:

its a combi(potterton performa 30he) i presume the pumps in the boiler?..was just gonna branch off the existing pipe work which is 15mm