In an earlier contribution to this discussion,
Ed Sirett wrote:

On Tue, 01 Apr 2008 14:02:26 +0100, Roger Mills wrote:

In an earlier contribution to this discussion, tvmo
wrote:

Are sealed systems better than open systems?


Better at what? Are apples better than bananas?

Sealed and vented systems each have pros and cons.

In domestic systems I'd have to say that sealed is almost always
better.

I would have to agree that sealed systems provide a better techical solution
in preventing pumping over and air locks - but there is rather more to go
wrong. They are less tolerant of slight leaks, and failure of the expansion
vessel causes a whole raft of problems.

It would be interesting (but I ain't going to do it! g) to see an analysis
of all the posts here which report problems with CH systems, and showing
what proportion are sealed vs vented.
--
Cheers,
Roger
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