I have a Rinnai V53DEP propane external tankless water heater. The manual calls for a disconnect, so I provided one.
My plan is (was?) to have a flexible whip take all the wires (power and remote control) into the unit. However the problem is this goofy plastic hinged grommet doodad thingabob under the unit that has threads that don't quite seem to match 1" PVC.
So now I have to come up with some kind of contraption to adapt the goofy plastic thing to the whip. I've gotten this far:
Any ideas? This feels kludgy and flimsy. Oh yeah, and the valve handles are right next to the conduit. I have a set of knockout presses, and I am very tempted to use them
(editorial rant) Arrrrrrrrghhh … why can't these jokers just provide a 1/2" knockout? Wouldn't that be easier? Why anyone would DELIBERATELY complicate the design of something? Am I missing something? Or maybe I got some weird offshore model that uses North Korean fittings?
EDIT: adding shots of underside of heater:
Best Answer
OK, so I called the support line, and to my (pleasant!) surprise, they were willing to talk to me, a mere homeowner.
Running the power cord up through the grommet is intended. But the gentleman also said it was acceptable to drill/press a hole in the bottom of the unit to attach the whip to, provided I use a gasket on the whip end and don't hit anything with the step drill.
I will do that, as well as run the controller cable separately through the grommet piece.