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The Wall has a powerful search engine that will go all the way back to 2002. Use "quotation marks" around multiple-word searches. RIGHT-CLICK on the results and choose Open Link In New Window so you'll be able to get back to your results. Happy searching!
In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
Heat the DHW while not there?
a digital Intermatic timer on my MPI/Monitor DWH heater but set the temperature at 140 degrees for when it is on to kill any nasties. I encourage you to do that.
Tepid water is a dating bar for Legionella.
Viessmann Vitodens has a specific cycle to roast the little buggers and allows for setback so you are right, there is an application for this.