I guess that's a rhetorical question but the return needs to be at the bottom, hot water is less dense so would float out the top again otherwise.
Flow is actually better at the top in theory.
Tried that, got a couple of duffers from there too. One consistently let me down on about four appointments then just stopped answering, the other left me with a non working gas fire because they couldn't work out how to re-assemble the isolating cock.
I guess that's a rhetorical question but the return needs to be at the bottom, hot water is less dense so would float out the top again otherwise.
Flow is actually better at the top in theory.
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