If you feed the hot supply in to the top of a matrix & the return cooler water out of the lower level, you will aid circulation by the thermo-syphonic effect Unfortunately Inlet and Outlet are exactly the same level.
"Y mae dafad ddu ym mhob praidd"
1972 4/4, 1981 MGBGT, 1984 FLHT1340, 1980 XLH1000, 1990 ZX10
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