So I finally got my onboard hot water system set up. It uses a Sureflo pump with a heat exchanger. Ties into the return line from the heater. Has about the same pressure as a typical garden hose has. I wrapped the heat exchanger with reflectix to help keep the heat away from other components around it. The pump itself is fantastic, cycles perfectly and will run constantly and dry if needed (to evacuate the system after use). I used the garden hose quick disconnects on the end of the hoses and attachments for ease of use, I also have some extension hoses that have the quick connects so I can pull or push water further. I have yet to fully test out how hot the water is after going through the system, just ran out of time yesterday. I picked up a three pack of varied garden hose sprayers for the output. It can be ran with the engine on for hot water, or if the engine is off it will just pump water from any source.
Here is the final set up:
The blue switch turns the pump on (middle one is for the solar charger, bottom is for under hood LED lights):
Here is the top of the exchanger ( mounted in the passenger front corner of the engine bay):
Here is the pump (mounted in my front bumper):
Here is the intake that you can't see in the bucket (I just got mine from Lowes, but it is the same thing, has media and a screen in it for filtration):
Here is the pump I purchased:
http://www.amazon.com/gp/product/B003EB ... UTF8&psc=1
And the heat exchanger:
http://www.amazon.com/gp/product/B001QQ ... UTF8&psc=1
No real need for this, just something I wanted to do. Although I do have a cooling/misting system planned for summertime use.
2012 Beast.
I was looking at this on a trailer: at 1:40 
