"mike" wrote in message
. 1.4...
wrote in
oups.com:
While fitting a new radiator at friends house disovered there is
only one tank. So obviously any inhibitor added to the system could be
drawn off bit by bit via expansion into the hot water cylnder.Should
I either leave the system un-dosed (as it always has been) fit a
separate expansion tank ,theres easy access and plenty of room. Bearing
in mind the crud in most headers its unlikely anyone would drink from a
hot tap...but I think a mixer of crud and inhibitor would be Very
bad thing indeed. Ta, everyone
Sounds like a Primatic cylinder, where the circulating boiler output is
topped up from the clean water in the tank.
Dosing would be a very bad idea, replacing with a conventional cylinder
and
Feed/expansion header prolly would; often though these were used because
of
shortage of room, (or parsimony)
Primatic cylinders were expensive. Although before poly F&E tanks and they
were zinc coated steel, it may have made some sense in equipment purchase.
It was just quicker to install, probably saving a little on labour, if
anything. I could never see the reason for them once poly F&E tanks came
about, and they are still sold.
Some makers say you can dose the CH, but only directly into a rad and the
inhibitor has to similar to X-100 or the harsher Fernox.