"John Rumm" wrote in message
news:9L2dnU7DtO8yE27anZ2dneKdnZydnZ2d@plusnet...
Doctor Drivel wrote:

The problem with sealed system is that the filling loops are left
permanently connected by installers - not supposed to be. Some are a

That is not a problem with sealed systems. It might be a problem with some
installers.

It is a big prblems with sealed system.

part of the boiler too. When the expansion vessel deflates, or a leak,
the user just tops it up by turning the tap. This leads to water gushing
out of the discharge pipe, sometime onto public walkways. And the users

Clueless people can cause problems with any installation.

A sealed systems happen to be one in big way.

They are just as likely to leave a header tank system pumping over for
years.

Very rare.

corrosion. Sealed system expansion vessels fail eventually - usually
sooner than later.

Plenty of people seem to mange for twenty years or more without any
problem...

Most do not.

snip drivel