How can this be done? So there is a container with hot water, and it's highly pressurized. It also has an output potential with a pressure reducing valve. I'm trying to workout how to feed the pressurized container with colder water (to refill). My first thought was that maybe when pressure is released through the pressure reducing valve, will it be possible that as it's releasing water, it can also be fed as the pressure going out can also bring water in? -Although I'm wondering if the uniform pressure still contained inside will prevent inlet. What do you guys think? -Hope this isn't too vague.