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Wow! I did not know that the victorians used water central heating system, I though it was all Roman/ caveman style where the exhaust gases of the open fire would run under the floor of the houseA CH system using hot water could only work using convection with gravity where the hot water would be heated at the bottom of the system, the hot water rises, enters the heat emitters and as the heat is transferred out into the air the cooler water then falls under gravity setting up a convection/gravity circulation. It's how the original centrally heated system used to work. Don't think it specifically requires the water to enter the rad at the top TBH, though that's only supposition. In fact single pipe systems use exactly that principle to work correctly (albeit the main flow would be pumped), where the hot water uses convection to enter the rad create the flow and then convection/gravity to exit (and some help from the flow in the main pipe), that and some cleaver and very specific piping up usually with large main pipework and rads to help modulate the heat supply and some very exact balancing.
Is there anywhere I can get a diagram of a gravity feed CH system as I may like to try it out myself