On Wed, 5 Nov 2003 14:23:35 -0000, "Christian McArdle"
wrote:


In any case, the boiler MUST have a downward firing burner onto a single
heat exchanger. Anything less will give you grief.


I guess that you are thinking of the older dual heat exchanger jobs?


Mine has a cylindrical heat exchanger like a drum with pipes inside
around the edge and the burner being a mesh affair at the centre. In
effect, the heat is exchanged radially from the burner at the centre.

Condensate happens around the periphery and runs to the drain sump.

The whole assembly is stainless steel, of course.

Viessmann uses a similar arrangement to MAN Heiztechnik of the Econox
type burner in their Vitodens 200.




..andy

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