I have a WaterFurnace Model: NSW025G10HCSS0DA water to water unit and I have in interconnected to three 200 gallon tanks. My problem is that the unit comes with two sensors, the first monitors the input line going into the water-to-water unit, and the second is supposed to go on the tank. That's fine for a single tank system, but I have three tanks and until the sensor monitored tank triggers the unit to start up, the other tanks cool down without triggering the unit to start up. I need to find a way to monitor the temperature in all three tanks so if any tank drops below set point, it triggers the unit to turn on and circulate and heat the water in all three tanks. Is there a workaround for this problem? Can sensors be wired in series? Is there a sensor gateway product that could connect all three, but send only the lowest temp info to the unit? During normal, everyday usage, the tanks cooling don't create a problem, but when we had a house full of relatives over the holidays, the issue came to light. Any help would be appreciated. My vendor is also researching it, but I wanted to ask other sources.