Tankless propane hot water heaters

Seems to me with a limited water supply, a limited gray water tank, and venting requirements, they are not very practical for a small travel trailer unless you're only at full hookup sites.  I suppose you could mount it outside the trailer, but you're inviting a whole host of other problems in doing so.

I've been using one all week at my sister-in-law's and it works great.  I was looking at it the other day and thinking it would sure fit nicely in the trailer since it's about 8" deep, 14" wide, and 18" high but it's really set up for a wall mount hand has to have free space above it to let the hot combustion gases out.  In the limited space of a Pod that's complicated, you have to pass through a gallon or two before the water gets hot, and you have to have continuous flow to keep it hot.  But for taking a nice hot shower it works well.

It's hardly worth the effort.  That extra 6 gallons of water in the grand scheme of things isn't going to make that much difference unless you're already loaded to the max.  Simpler to just put in 6 fewer gallons in your fresh water tank.  What's the weight of a tankless heater with all the ancillary piping and heat exchanger?  I suspect, but really don't know, that it is not significantly different from the Suburban heater you have.  

I asked my sister-in-law if she'd mind if I took hers off the wall to weigh it.  She looked at me like I was nuts and started laughing at me saying:  "En tus sueños."  So, I dropped the idea. 

If you stick with Suburban their tankless unit weighs 36 lbs and the 6 gallon one weighs 32 lbs empty. 6 gal water weighs 50 lbs so you'd save 46 lbs with the changeover to tankless. 

If that's worth it or not is going to depend on how critical it is to save that weight on an individual rig. I could see doing it if I had to replace my water heater anyway. it's a personal decision, no right or wrong to it one way or the other.