On 1 Nov 2020 at 11:10:48 GMT, ""Dave Plowman" News)"
wrote:

In article ,
wrote:
On Saturday, 31 October 2020 14:54:24 UTC, John Rumm wrote:
+1 or at least, it can be fitted, but isolated at its service valves.

Do good plumbers fit service valves to all the pipes at the boiler?

(Mine didn't.)

You can't do that. Close them all and there would be nowhere for water to
expand to.

Except perhaps the expansion(sic) tank.

--
Roger Hayter