The u-bend idea that i had may also cause this boiling to happen. But perhaps at a lesser rate. I could relatively easily fabricate a u-bend to fit in. A simple manual bypass could be incorporated so i could open it if i heard boiling. It may also help when filling the system by removing airlocks. I'll get cracking tonight in work and source some pipe. Then i'll have to brush up on my TIG welding......either that or get rid of those pesky pigeons from over the welding bay...heh!
ollie
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