I tee'd into 15mm pipework below the flow and return valves of an existing rad. Because the new rad was to be located in a porch and working space was limited I used 10mm pipe. New rad refuses to give off any heat but I note the following: (1) the rad bleeds ok. (2) When I remove the rad I note that the flow out of the thermostatic valve is appreciably less than the flow on the return side. (3) I have flushed the rad. (4) If I shut down the nearest rad the new rad warms slightly but not to any degree. I would appreciate the views of an expert who can point out where I have gone wrong and perhaps more importantly how I can get the rad on my side.
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