I live in Arizona. My water heater is an 82 gal Solaraire. I also have a 50 gal water heater that was used as a storage tank. Both of these water heaters had the usual in/out, but also had in/out on the sides of the tank. The way the system was hooked up was the water main went into the cold of the storage tank. Storage tank hot went out to the main water heaters cold in. Main heater out went to the house. The side in/outs were connected together with the solar connected inbetween. The storage tank leaked, so I had to by-pass it. My main is soon to follow. Every new tank I look at has the usual in/out on top, but no other connections. How do I hook it now?