@FourOh-LLC I think you miss the point of this. If you're recirculating hot filtered water + more fresh hot water, you have a hot shower. Potentially would introduce some gross stuff into your shower line, but listeria is already an issue in a ton of residential water tanks thanks to EnergyStar :trademark: pushing for lower tank temps. As a pro tip, you can fix this yourself by installing a loop and cranking up your water tank temp. The loop simply introduces cold water to the extra hot water at the supply line and pushes it into your main. This is how systems used to be setup years ago but they've fallen out of favor because of muh climate.