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Gonna make a hot water heater for the toy hauler........

A

Anonymous

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I don't know if this is on the market but I'm in the process of making a heat exchanger that will make hot water for the camper. My "idea" is to have a 20 or 30 gallon storage tank that is super insulated (like a thermos bottle) and use the heat from the truck exhaust to heat the water which will be used to shower with and flush the potty. On my first try the water went in at 62* and came out at 97*. When I sent the heated water through a second time the temperature increased to 137*. Now to figure out a way to regulate it so that I don't overheat it. If there's any engineer type people that can give me an idea of how long it would take to heat 30 gallons of water with the exhaust (at idle) it would be much appreciated. Oh, the exhaust gas temperature at idle looks to be 167* at the tip.
 
Couldn't you just put a by-pass solenoid control that would route past the exchanger once tank temp was met? That or have one of you guests test the shower first.
 
I guess there's a number of ways to do it. My thought was to have like 4 of these exchangers arranged like a box with one end sealed and the other to clamp around the exhaust tip. The goal would be to run the truck only a few minutes to bring the water temperature up to like 104* and it would only be used while the trailer is parked and a need for a shower. Probably test it on the dog first.
 
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