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I think I'm could do this. We only have the oil boiler and the new boiler is a condensing one. This means I will have to install the condensate trap and drain, but that's straight-forward. I take your point, and I'm sure the original installation is an example of the scenario you describe...

Yep, that's what I meant. Chris

I think the vent is connected to the flow after the boiler and after the branch to the downstairs UFH and before any of the upstairs rads Because of the exposed location and the draughty original sash windows, the old Potterton Statesman 90/110 boiler could not keep up with the heat loss on...

It is pumped out via the vent Separate Approximately ten feet below the F&E tank The new boiler (Mistral CKUT3 - 90/120) has arrived and only has a single vent and a single flow connections and the connections are in different positions, so some re-plumbing is required. The house is a...

We have a problem of warm/hot water being PUMPED into the F&E tank via the expansion pipe. It doesn't happen all the time. Someone suggested that it could be caused by the pump being positioned in the wrong place in the system (but it seems correct) or by sludge build-up forcing water to flow...