On Thu, 02 Sep 2004 20:11:07 +0100, Andy Hall
wrote:

This gets more and more stupid. Now you are adding an additional
heat exchanger to the mix.

You've forgotten the plastic pipe under the garage floor to preheat it
all.

LOL!

BTW do all condensing boilers modulate right down, or do some just
have two output levels for DHW or CH?

cheers,
Pete.