I have a hot water heating system that uses two 40 gallon gas water heaters. One went bad, during replacement of one of the water heater,,i forgot how the cold and the hot lines were place.
When I re installed, from the cold water supply to the cold water-in of the first heater, then the hot-out of the first hot heater to the cold- in of the second heater, the the hot out of the second to the house hot water. this line has a tee one goes to the heating system and the other to the hot water taps. is this correct the heaters should be in series?