Tankless water heater for outdoor/overland use

in the market for new camping/hunting supplies, and have decided I could use a water heater for cleaning dishes and a hot shower/washing experience.
Anyone owned any of the various brands out there? Suggestions? Experiences? I was looking at the Costway unit, as it includes its own pump and everything else needed. However my king is obviously not made up. Help me out!! What has worked for you?

 

This is the one I use. Works awesome for dishes, we bring a big clear tote and a few 5 gallon pails that work really well for the job. My only complaint is the pump is a little weak, and the heater shuts off automatically if it sees a drop in pressure. So for example, I used an old cymbal stand and a zip tie to attach the shower head above so I could shower outdoors (it was about 45-50* out)
With the bucket on the ground, it wasn't pushing water fast enough to satisfy the sensor, so I had a burst of ice cold in the middle of the shower. Problem was solved by putting the bucket next to the heater on the picnic table. Works awesome otherwise.

Also, I didn't mention, but it does come with a pump and shower head setup. It was about $200 on Amazon. Coleman has a similar unit for a little more money.

 

Can you upgrade the pump on that setup? Which Mr Heater is that one?

 

Oh and for anyone in the market for the Mr. Heater Boss series tankless water heater, summit racing has great deals on the two lower models—the one in the above pic is $160 or so and the step up from that, the XW18 is $215. I have yet to find the Boss XSW20 cheaper then $299.49 on Amazon and summit.

 

The pump is external, so it would be easy to upgrade. It runs on 4 D batteries, but I don't see why you couldn't get a 12v pump and hook it to the truck/camper battery.

 

Any ideas of the needs of the pump for these systems? What psi does the plumbing like and what size is the tubing from pump to heater? I thought I saw 0.68-1.2 GPM so was thinking of picking up a 12v SeaFlow 1.2 GPM pump or larger but what PsI? 35 or 70?

 

Haven't looked into it as of yet. The tubing is pretty cheesy as are the quick connect fittings. I'll check the flow rate of the pump.

 

Looks like about 3/8 hose, there is 0 info on the pump.

 

I have been eyeing up that same unit man...glad to hear you are enjoying your time with it. I was gonna go with the middle of the road u it, the Boss-XW18 from summit. Amazon is about $40 more but stats can be seen here:

Mr. Heater BOSS-XW18 Basecamp Battery Operated Shower System

Mr. Heater BOSS-XW18 Basecamp Battery Operated Shower System

https://www.amazon.com/dp/B011TRLUS8/ref=cm_sw_r_cp_api_GYyTAbTYS8JG1