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Robert Gammon

wrote:
Edwin Pawlowski wrote:

wrote:

you won't get it all out because if you do and there isn't anywhere for
the expansion, then the water will burst the pipes if it gets to cold.

The expansion tank is for warmer water, no?

High oxygen does cause corrosion. In industrial systems, the best way to
get rid of it is to use sulfites as an oxygen scavenger...

Would this remove all the oxygen in the expansion tank? Seems unlikely.
Would pressurizing the expansion tank with nitrogen make it last longer?

Nick

The expansion tank allows for the expansion/contraction of water as it
heats and cools.

Dry nitrogen in the expansion tank will help with rusting on the AIR
side of the tank.

Oxygen dissolved in the water will eventually create bubbles in the
system that will have to be bled off,else the pumps won't work. Filling
a radiant loop with RO filtered water gets you VERY squeeky clean
water,but comes at a price of excess dissolved oxygen. If you can afford
it, then Distilled water is a better choice as there is no excess oxygen
generated in the production of distilled water. IMHO, Distilled water
or RO water are the only water sources that SHOULD be used to charge/top
off a radiant heat system.