BillA > One question more
: Have you already test a rad in the 2 possible way (assymetry of inlet/outlet) ?? Because pressure drop are less important when water come from the tube and enters a small tank than a big tank and pressure drop are different too for the flow exit..
If you can do that for one rad (since87's rad for example or another with a great assymetry), it could be interesting to see how much difference is and if it's really important (put the 2 possibilities on a same graph)
