How to Install Water Heater
One of the most common household plumbing projects is replacing a water heater. Here we will tell you how to install electric, LP gas and natural gas water heaters, the most common types.
Step one: move your new heater to its location by "walking" it or by using an appliance cart, dolly, or hand truck. Position the new heater so your piping - particularly a gas vent pipe - will reach easily. Every gas water heater needs proper venting that's no smaller than the draft hood collar of the new heater. The vent should go straight up as far as possible.
Step two: now you can make the hot and cold water connections. The type of materials you use will depend on your local code and the type of material used in the existing system. One of the easiest ways to make these connections is using flex-connectors, which are easy to bend to reach the connection.
Step three: whatever the piping, the heater should be fitted with a cold water gate valve. Place the valve in a vertical section of piping to keep it from becoming fouled with sediment.
Step four: unions are not necessary with flex-connectors. Use Teflon tape (but not pipe dope) on the male threads entering the flex-connectors.
Step five: choose thermoplastic pipe. Flex-connectors are not necessary with CPVC or PB plastic pipe. You'll need "transition unions" between the metal heater threads and the plastic piping. Don't try to hook up a water heater with PVC, PE or ABS plastic piping, since these will not take hot water.
Check your state and local codes before starting any project. Follow all safety precautions. Every effort has been made to ensure accuracy and safety. So be careful when install the water heater.