Thanks, that's helpful. Ours is inside on a garage wall, but the idea is the same. Now to see if there are any plumbers in the area willing to consider this.
Yeah, that would have been nice. How possible is that now that drywall and everything is in place? There is a substantial crawlspace where the first floor plumbing is probably accessible, though it's hidden under insulation.
Actually, given how many errors this subcontractor has made, I...
We very recently had a Rinnai RUR199iN installed in our home. It replaces a RU180iN. The RUR adds the crossover recirculation capability.
They installed a thermal bypass valve at what we think is the furthest point in the circuit, which is at a sink in the master bathroom.
It's not working out...