I would just make the connection in the utility room and exit as conveniently as possible (above grade) and use a PVB. Yes. PVB. Even if you have to arrange to return the RPZ and pay a restocking fee. The property is small enough to supply from the reduced pressure in the house plumbing. This is commonly done by professionals, where a finished basement makes more direct connections too costly. Sometimes, the pressure reducer might be tweaked a bit, like raising the regulated pressure from 50 psi to 60 or 70 psi. The house plumbing is still protected, and the system design can be easier with the extra pressure. (although, with PEX plumbing indoors, I might see how it goes without doing any PRV adjustments)
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You can do all this and use the RPZ outdoors (you do know these devices are supposed to be at least a foot above grade) but that won't leave you with a lot of pressure. It would be enough for a good pro to do a good system, especially if sprays are used, as opposed to rotors.
This post has been edited 1 times, last edit by "Wet_Boots" (Jul 10th 2009, 7:26am)