DIY Tankless Water Heater

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The reality is, I’ll probably do more homework and kick the can down the road for now. It’s not that big of a deal. The kiddos just wait their turn, and we wait about 30mins between showers. It’s not even that often that everyone needs one at the same time. The kids do night baths, and I’m a morning shower person. I would have just liked to address the complaint if it was easy enough, but not ready for a 200A service upgrade yet.

I probably would have just done it if I could have just added the electric tankless, but the gas one seems like more of a hassle and more expensive. The crawl space is only so tall and I don’t have a spot indoors for a bigger heater.
 
I think I’d have to pop in a couple thin or tandem breakers for the lights and outlets or something so I can add another double pole. Not a big deal, but the box is getting full.
 
Yeah, you can do that. Depending on your panel they make "quad" breakers that give you two double pole breakers in the space of one.
Or, if you're into complexity: plumb them in series, and put them on a single circuit with a lockout relay that gives the second tank priority.