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I sourced my own parts from Amazon and home depot. This all cost me $250 and took less than a day to install. You bypass the heater supply hose through the heat exchanger and use the pump to push water through the exchanger. I hold the hoses in a screw top 5 gallon bucket along with my soap.
It gets warm the first time through but if you cycle through the bucket for 45 secs it can get up to 120 degrees. Always has pressure and you can get 2 people bathed in 1 bucket.
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Now to me this is the perfect set-up. I have though about this before and even have the flat plate heat exchanger on hand.
With this set-up you get hot water with or without sun, cold temps will not matter. You can get a hot shower on a cold morning in the shade.
I also like this set-up because you control the amount of water, you are not limited to what fits in the tube. You can even stand in a large bucket and recycle the water for a nice long shower without wasting water.
Park by a lake or a stream and you could have an endless hot shower. You would just need a long suction hose and some environmentally safe soap (Dr. Bonners, etc)
The only down side I see to it is that you have to run the engine to heat it up first. However, if you have been driving the engine is already hot. If it is a cold morning, warm the engine and take a shower right before you hit the road.
Thank you for sharing this with us.
