On Sat, 13 Nov 2004 22:19:34 -0000, "IMM" wrote:



These people mainly deal with commercial applications, where headers are the
norm. You intend to use UFH, contact the UFH people and just about everyone
of them will say use a thermal store. So their weight of opinion would be
greater, as there are more of them.

That is not a sound argument.

Using a header will lower a condensing
boilers efficiency, that is certain. Ask the boiler people about
connecting the boiler to an integrated thermal store with the UFH and rads
taken off the store. Not one will say no.

You also have to take into account that the tech depts have people who read
from crib sheets. Did you ask them about a header specifically? Or did you
ask them about running a UFH and rad system off the boiler?

Look at this:
http://www.heatweb.com/techtips/unde...orheating.html

Then scroll down to Twin Zone Thermal Store Injection System

A dedicated UFH thermal store shown with the old fashioned type of waether
compensation of stats. Cheap and effective. Of course an outsise weather
compensator can be fitted to maintain the UFH section to what the outside
temp dictates.

Rads can be taken off the top of the store.

Also go to:
http://www.heatweb.com
scroll down to underfloor heating and see the solutions to underfloor
heating.


There are quite a number of muddled points on their underfloor heating
page.

For example, they say:

"Reducing cycling in itself will improve efficiency, however gains are
also to be achieved by keeping return temperatures to the boiler low
at all times. Without a thermal store this is very difficult to
achieve, unless the boiler has built in electronics. "

This is erroneous. If you have a modulating, condensing boiler,
which most are nowadays, they have temperature sensing and
electroniics to optimise behaviour.

Obviously a simple boiler with on/off burner control will operate more
effciently with a buffer. They don't present a convincing argument
for the case of most new boilers which modulate. Their whole "buffer
store" argment is based on the idea that the boiler will otherwise
cycle when driving the load, and this argument is flawed with a
modulating boiler.

I get the distinct impression, that as a vendor of thermal stores,
they are bending the situation to justify buying their product.






--

..andy

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