I bought a new stove ( in basement)and had a plumber friend hook all the DHW connections. There's a main 50 gal water heater and a 50 gal water heater used as a buffer tank. I thought all was good so I fired up the stove yesterday after hook up. Well today the 210 degree blow off valve is dumping water in buffer tank? This is after a morning shower. So I started turning on spigots to dump some water and it's still draining some. There's a mixing valve between tanks set at 130 so it doesn't ruin main tank (was told to hot of water will ruin elements in main tank ) . I didn't expect a wood fire to overheat 50 gallon so easily? I need some direction in what to do now ? After about $1000 invested in material , tank and plumber . I would hate to have to unhook it all??