My original mixergy immersion tank failed (some component), and I have been sent a new immersion tank. Weird thing is this tank has a coil for solar thermal at the bottom which we have no plan on using. I’ve read that you can’t cap a coil due to the build up of pressure on the trapped air, also this coil can’t be removed. Am I allowed to just leave it open (what if it leaks) or is that against code as well? Not sure what to do. Thanks.