Pictures would be greatly appreciated!
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Sorry it's taken so long, I've had a week including a sick wife, unplanned school closures, pretty much anything that could be out of the ordinary. Anyway, I pulled it out and set it up for a couple pics. Pay no mind to the sanitary kitchen setting, or the current length of tubes as I'm working on it to figure out the best length for them. Basically the pump and black tube from it goes to the inlet on the heater. One of the clear tubes goes from the outlet of the heater to the valve. Coming out of the valve is a second clear tube that runs back to the water source as a return. The other valve outlet is the black tube that feeds the shower head.
When you set up with your water supply, you put the pump and return line in the water bucket, and I have a shower enclosure, so I put the valve and shower head in the enclosure. Start with the valve in bypass mode so that the water is being returned right back to the bucket. That way you can fire up the water and then heater and let it get your water good and warm while you get in the shower and setup. Once you're ready, switch valve and get warm water from shower, then switch back to bypass while lathering up. You can switch freely on and off without worrying about the heater burning up because water will always be flowing through it.
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