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    expansion tank - diaphragm or bladder?

    I just noticed that the 6 month old expansion tank in my system is heavily corroded around the inlet. Looks like the connector is made of steel, and not stainless or brass. So I figured I'd replace...
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    Thanks for all of the suggestions. I'll try...

    Thanks for all of the suggestions. I'll try exchanging the valve (it was brand new) for another 3/4", and if that doesn't work, try a 1".

    Does the water meter at the street also have a pressure...
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    It's definitely not thermal expansion - I see the...

    It's definitely not thermal expansion - I see the pressure increase even when there's no demand for hot water, and the heater is an on demand type.

    As for putting the prvs in series, to minimize...
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    I'm seeing the low flow rate not on the radiant...

    I'm seeing the low flow rate not on the radiant floor circuit, but on the flow coming out of the taps. In fact, the radiant floor isn't even active right now, as the temps are pretty moderate here. I...
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    It's an open system. The plumbing layout looks...

    It's an open system. The plumbing layout looks something like this:

    http://www.radiantcompany.com/images/muni.gif

    I've put the PRV on the cold water line that feeds the house, since 55 to 60...
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    high flow rate pressure regulator?

    My water line pressure is about 65 psi, but I need to bring it down to 55-60 psi, so as not to stress the pex tubing in my radiant floors. I installed a Cash Acme EB86U (3/4") pressure regulator, but...
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