Do you need to replace your water heater? Tankless water heaters are a compact and energy efficient way to supply hot water to your home. Installing a tankless hot water heater involves many local building codes and safety considerations so it should only be done by a license professional plumber.
The first step is to turn off the heat and water supply. If you a replacing a standard type of water heater, get a hose and drain the tank.
Turn on a hot water faucet upstairs and disconnect the gas, water lines, and exhaust vents. The new tankless water heater should be installed in a location that allows it to vent to the outside. A tankless water heater needs more heating input for a shorter period of time. Once the heater is mounted on the wall, the new copper piping for the cold and hot water lines can be connected with threaded fittings. Cut the hole for the vent pipe and connect the pvc pipes. Turn on water supply to purge air and burp the pipes. Then you can open the gas valve. Make sure to follow any other local guidelines.