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Author:
alexddyang (Canada)
Hi,
I am replacing my 25 yr old radiant floor hydronic boiler.
Because my piping for the floor heating is poly-b, my heating company recommends a isolation heat exchanger, to create two isolated loops (a “floor loop” with old poly-b pipes and a much shorter “boiler loop” with new piping). As poly-b lets in oxygen, this will keep the oxygenated water within the floor loop, protecting the new boiler from rust.
But in addition, they also recommended a “Side Stream Water Filter” for the floor loop. Saying that if the poly-b is still corroding something, the filter will at least catch the debris or rust particles etc. But I am already getting new stainless steel pumps and heat exchanger for the floor loop, and my poly-b fittings are all copper, so I wonder what else could still be corroded in that loop?
In short, I wonder if the side stream water filter is worthwhile to get. Please let me know your opinions.
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Author:
packy (MA)
sounds like you are getting good advice.
i too think the filter would not be needed.
setting up the floor circuits so there is absolutely no iron nor steel piping is enough.
run 190-200 F deg water from the boiler to the heat exchanger.
set the mixing valve from the heat exchanger to the floor circuits to 125 F deg and you should be fine.
make sure there is a good thermometer in the feed pipe to the infloor heating.
depending on how much piping there is in the floor and how close the pipes are to eachother and the outside temperature, you may have to play with the temperature water going to the floor for maximum comfort.
the circulator for the infloor piping needs to be stainless but the boiler circulator can be a cast iron 3 speed grundfos (or equivalent).
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