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Many thanks to those who have replied. Had success with the rads by "balancing" the system (turn off locking shield valves (i think that's the correct term) and then back open by a quarter, and hey presto the new rad started getting hot. As for the immersion tank, i followed the pipe up...

1. Thanks, the side with the TRV got hot first so i guess i've got it on the right side. Any ideas as to why the rad is now no longer getting hot? 2. I have bled all the rads and double checked them, there don't appear to be any other valves on the system, not that i can find anyway. What are...

Hello, I have a Glow-Warm Back Boiler behind gas fire in chimney breast downstairs. There is a feeder tank in the loft and the hot water is warmed via the coil in the immersion tank. No automatic valves exist. I assume this is what is known as gravity fed. 2 Problems: 1. Had to drain the...