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thanks for your reply. I am not sure whether I have joined the pipes right or not. I have a 15mm feed all through out the house, so used 15mm pipes to join them together. The rad in the old part of the house that i have joined them to was the last rad in the system. Does this make a difference...

Just had an extension built and added 4 new radiators. Plumbed them all in but they are not heating up. I have a single looped system in the house all ready and joined the rads onto that system. The pipes going into the first rad is hot and so is the second rad. Not getting any heat to the third...