Fun little mini hpwh project. I'm curious, are you charging gas and adjusting the captube with superheat/subcooling in mind, or just kinda winging it to see what works? Given you have a excellent condenser design (though may potentially trap oil if thr velocity is too low) and a far overkill evap, this thing should be very efficient. You have all the equipment needed to get the measurements to solve for sh and sc. Let me know if you would like some help with that part!
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