I was going to run a 120v LWD element for RIMS function then kick on a 240v 4500 HWD element for fly sparging. I know with the talk about HWD not actually scorching, maybe I can run 2 HWD elements at around 3500 each so I can still run off my 30A outlet and have the power to fly sparge my 38* tap water. I'd rather over engineer the first time, then have to re-engineer a second time.
Also, for your dual elements, I'm assuming you will be running on 1 PID and 1 thermocouple, but 2 SSRs, one for each element? This would be a more cost effective way for me as well because I was going to run one PID for RIMS and one PID for sparging, each with their own thermocouple.
Ya, your stainless tubing is nice, but too rich for my blood. If I incorporate your idea, it will be with copper tubing instead.