"Pete C" wrote in message
...
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!

Either you are laughing at the notions of an amateur, which was good advise
if the mains water pipes are run under a conservatory floor gaining heat
from the sun, or have lost the plot.

BTW do all condensing boilers modulate right down,

None modulate right down to zero. I think the best of them goes to about 5
kW

or do some just
have two output levels for DHW or CH?

None have two outputs as such. One has two boiler run stats to give CH and
DHW, but only when using a priority system; when DHW calls, a diverter valve
diverts all the boilers heat to the cylinder at the temp the DHW stat is set
at.