[DutchmenSport]

We have a 12 gallon and take showers back-to-back. (2 of us). Granted, we do not take 30 minute showers. They are quick, in and out. And we (primarily) live in our camper all year round, even when parked at home.

We've never run out of hot water in our Montana (5 years now?) If you are on a full hook-up site you won't have this problem.... BUT, if you are not on a full hook up site, don't forget, your grey tanks can hold only so much water too! If you are not connected to dump line, then you won't want to take 30 minute showers anyway. Your grey water holding tank will fill up first. (something to consider...)

FYI, after tent camping and RVing since we've been married (37 years now), and both of us coming from camping families as kids, the idea of taking short showers is just a way of life for us. Even at home, we are in-and-out, just that quick. At home, if we want to experience a "long hot one", we'll take a bath or jump in the hot tub. Navy / RV / short / quick showers just becomes a way of life... especially if you live in an RV.

FYI, hot water on demand systems have their negatives. In order for the heat to fire (yes, propane), water has to start moving. Then the initial heat has to build up. Even in home systems, this is still true. Depending on how efficient the on-demand heater is, you could run a lot of water before getting "hot". Not to mention, that with either a conventional water heater OR an on-demand ... the pipes between the heater and the faucet are still initially filled with cold water. Unless your on-demand system is located within a foot of the water faucet outlet, it still takes time for the cold water that's been sitting will be displaced with hot water, and it will still take several or (depending on how cold it is), minute(s) before the water at the faucet actually gets hot!

Before investing your $$$ into switching, give the 12 gallon a try, adjust your lifestyle, see if it works. You've adapted to living in a "tiny home" now, why not adjust to "tiny home" living. With a "tiny home" everything becomes minimized, even one's water usage.