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
central heating
- Thread starter naylor
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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.
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 said: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.
Yes - but what boiler is it? Combi? system boiler? where's the pump? what size of pipe are youb planning to connect TO?
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