On Wed, 10 Mar 2004 00:52:28 +0000 (UTC), "Michael Chare"
wrote:

"Andy Hall" wrote in message
.. .

non system vs system
===================

whether or not the boiler has the pump and possibly controls and
expansion vessel inside the case.

From what I have seen some boiler manufacturers just use the word 'system' to
denote boilers which would be better described as 'sealed system'.

Michael Chare


Teminology is used loosely, which is what makes it confusing.

You really have to look past the names given and see what is actually
inside,

There are system boilers which will only run on open vented circuits
(not so many now) and some that will run on both as well as sealed
only.

Unfortunately, "system" seems to be used to describe anything which
contains more than a heat exchanger, gas valve, safety device and
thermostat (i.e. more than the bare minimum)



..andy

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