In an earlier contribution to this discussion,
TheScullster wrote:

"John Rumm" wrote:

A new boiler will be able to run sealed anyway - so you could lose
the vent and header tank etc anyway.

Must confess I am reluctant to take the sealed system route.
Partly due to lack of confidence in existing within-concrete-floor
plumbing. Partly from the safety angle - blocked relief valves etc.
As stated, the house is 1970s build. Do you happen to know whether
there were quality issues around this time for flux/solder.

Even a sealed system will run at a *lower* pressure than your mains cold
water supply. Presumably that is ok?
--
Cheers,
Set Square
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