On Dec 4, 7:12*pm, "Brass Monkey" wrote:
"ransley" wrote in message

...
On Dec 4, 6:21 pm, "BigWallop" wrote:





"Brass Monkey" wrote in message

. ..

You would only turn it up to full on the main boiler thermostat, but your
room stat and radiator thermostat valve would regulate the heating into
each
area of the house. However, I have found that the boiler can be reduced to
around three quarters of the way up the boiler 'stat, and the systems
usually keep going without any detrimental effects on heating comfort.

Whether turning the boiler 'stat down a little is any type of energy
saving
concept, I have no idea. I only know that the boiler doesn't fire up for
as
long as it did with the thermostat fully on. Though it may be firing up
more often than it did at full temperature.

Me thinks someone with a little more expertise, should get a grip of this
to
tell us either way.

Why dont you go to the manufacturers site and see for yourself, Im in
the US and all condensing boiler specs I have read show the peak
efficency is under 140f, at 180f they are about 6% less efficent. I
find alot of "pro" installers idiots. They dont read. *My "pro"
installer who has been installing and repairing maybe 40 years I just
found sets Steam units very wrong, trust yourself and read
manufacturers specs.

Worcester Bosch don't seem to offer any suggestions on this point.
At least, I can't find it.- Hide quoted text -

- Show quoted text -

The condensing design has limits and all are designed from the same
principle, this information on operating temp and efficency is all
over, Google it and go to different boiler manufacturer sites, even
contact Bosch, Its a fairly linear degradation over 139f or less than
135f, there is an optimal temp you want to try to not go over, the
aquastat under the boiler cover or on the boiler should be easily
adjustable to lower it. The less a boiler cycles, the longer run times
also keep it most efficent, unless you pump the water 24x7 and the
pump is old an inneficent. My new pump uses 50% less power.