Thats just a regular 12V demand pump from any motorhome, camper, trailer. I used a friends older F-250 as a lab rat and used a demand pump and boat heat exchanger tied into his cooling system for hot water. You just pull up to any water source (lake, river, stream, ocean, hose bib), hook up the inlet and outlet quick attach hoses and flick on the pump switch. Give you unlimited (truck running of course) hottish water for showers for all the girls you dirtied up the night before. You adjust the outlet valve (ball valve) for how hot you want the water, less outflow means the water is in the exchanger longer thus hotter water. Chicks dig it and so will you when they crawl in your sleeping bag the next night.