On Wed, 29 Oct 2008 10:39:13 -0000, "dennis@home"
wrote:



"Mark" wrote in message
.. .
Hi,

My boiler shows the return temperature of the CH on its display.
Earlier today it was showing 75(C) which seems very hot. As it is a
condensing boiler won't this mean it is operating outside its
condensing mode?

Steam starts to condense at 100C.
Most of it will have condensed at 75C.

I had heard that the flue gasses had to be below 55C to get the full
benefit of the condensing mode.

I read the following on several web sites:
"It is only possible for a condensing boiler to work to these very
high efficiencies if the flow and return pipework is also kept below
55°C."

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