Replacement hot water cylinder question

13 Nov 2013
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United Kingdom
I'm just about to replace my hot water cylinder (open vented pumped indirect). It's about 20 years old and predictably the flow for the indirect coil is considerably lower down the old tank compared to any new tank I have looked at. So I'll have to modify some of the pipe work.

At the moment the 3 way valve is at the same level as the flow into the indirect coil on the side of the old cylinder. When I put the new cylinder in with the flow into the coil being a few inches higher, I was thinking of just bending a new pipe and connecting it onto the new flow.

However if I do this I'm thinking I'm asking for airlocks as the top of the indirect coil will be above the level of the 3 way valve. Should I modify the whole lot so as the 3 way valve is level with the new flow into the cylinder?, or is is acceptable to fit a vent at the top of the new pipe into the coil.
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