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[NHmtndad]

Yes I understand and agree. How would I go about being redundant with two relief valves? Is it as simple as putting in a tee where the existing valve is with a valve on each side?

[slimjim]

Anyplace in the line or preferably on the boiler, vent it to within 1 foot of the ground and if you use a ball valve to shut off water before the relief valve take the handle off the ball valve in the open position to ensure that it does not get shut off by accident, THANK YOU for listening to my concerns.

[NHmtndad]

Looks as if the isolation valve between the pump and the OWB has a weeping leak. Is it possible to just replace just the recessed screw? See pics.

[slimjim]

No they have no packing nut that can be tightened, You will more than likely break the stem before you can even close it. Replace it with a real watts isolation flange, the set should cost you about $40

[LittleJohn]

The pipe/fitting may be toast because liek all things metal (think OWB/most fittings) they transfer heat.  Like I learned in Engineering class - everything in nature want to be equal - so heat will actaully travel down the metal fittings to the plastic pipe.

***This is also why you are supposed to plumb 18" away from DHW and other such heat sources before you transition to PEX - the whole heat transfer

[Sprinter]

PRV's -pressure relief valves don't have temp ratings, only 30 psi relief and xxxx btu ratings. They must be located on the heat source without isolation. Normal routine maintenance includes replacing them annually. Steam is very damaging to any rubber or plastic components in the system. They should be tested manually or by cycle once a year, cuz they like to stick , turning a 30psi relief into a 50-60psi relief and thus a violent dump when they do go.