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If you already have 3 inches up to the toilet, I don’t think you need to keep that size all the way to the vanity and washer. 2 inches should be enough for that branch, especially if the vent is separate. Just make sure the slope is correct.

I had the same issue with a sink installed last year. That double hole confused me too, but it’s normal. One connects to the overflow, the other just lets air circulate to prevent vacuum. The smell comes mostly from toothpaste and soap buildup.

The big difference from the unit is 800$ at Lowe’s is that a non-condensing install eats materials and time: a dedicated roof vent, isolation/flush valves, possibly upsizing the gas line, plus work in the crawlspace and attic. Many installers won’t warranty something the client supplies (that’s...

I had the exact same model and got confused at first with the BLFC settings. Mine was hidden under the tank cable, tiny tag, easy to miss. Once I found it, everything made sense.

I had a similar setup in a small marina and fiber was the only stable solution. Copper didn’t hold up because of moisture and lightning. Run everything in PVC conduit and raise the junction points where flooding happens most often.

Yes, the power draw is basically the same, but on Low the voltage drops so the bulb shines dimmer. It's not that a resistor wastes energy, it's just voltage control