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Primary secondary piping

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World Plumber
World Plumber Member Posts: 389
in THE MAIN WALL
I'm replacing a boiler that had been condensating and decided to break in half while sitting idle. I want to use primary secondary pumping on the new boiler. It is one large zone with 3 inch headers. should I use flow control valves? Should I have both pumps come on at the same time or bring the secondary pump on after the boiler warms up?
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