Thanks everyone for your comments on my original question.

As I said in my original post I was only trying to think ahead to the
future when the current back boiler needs replacing. I specifically
didn't want to get into the "get a combi" argument which was the
reason why I only gave details specific to my question. It may well be
that when the time comes the tank gets removed and I *do* get a combi
but until then that's irrelevant.

Andy.

"Dave Plowman (News)" wrote in message ...
In article ,
IMM wrote:
But I know how to give him then best solution. he doesn't, neither
do you.

You missed out the word "think". You "think"

Correction: I "know".

Well, if you know, why did you leave it out?