Its seems hes enjoyed the process and it seems its serving his purpose well. Personally I’d love to make something like this, I’d enjoy learning about it. I want something like this in my future in my garage for detailing my cars, so I can be off the trigger and the machine just turns off instead of the homeowner models having to spray it all the time
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The pressure pump should be safe to 145° or so, especially since you’re eliminating a major stressor of most pw pumps: rapid thermal cycling. I would honestly be surprised if you ever approached that kind of heat during normal use of your machine. You’d have to completely forget it was running or something.
Your plumbing setup is actually resembling an open-loop radiant heat system in some ways. It might help to take a look at some schematics to see how those are usually plumbed, with the expansion tank, holding tank, etc.
I forget if you touched on this or not, but you might want a T&P safety valve, as well. Anytime you have a pressure vessel and a heat source, it’s a good idea 
I think this is a wicked cool setup for a homeowner. Props to your ingenuity.
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I have a relief valve ready to go but I was debating on where to put it and I ended up forgetting. I’m going to have to pull the tank to weld it in. I’ll probably try to scrounge up a dedicated gauge and thermometer while I’m at it.
Impressive test results. Only 8°F/hr heat rise.
I must have had my buffer tank down to practically nothing that time I noticed it getting warm from bypassing. 
It is only 3gpm though. Most of you run more than twice that. This is the professional homeowners model.
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