Hi, I'm a bit stuck on a hot water circuit that I'm trying to come up with for a small guest house. I have 6 water heaters with built-in heat exchangers that I'm planning to connect to a loop, itself fed by a solar water heater and/or a heat pump. I came up with 3 options (see drawings), but I'm not very confident in what I drew! I doubt anyone came across this kind of installations, but if ever one of you can give me some advice, I would greatly appreciate it... Thank you.