The flexible tubes then fit between them with coupling nuts that screw onto the adapters. This requires attaching male-threaded adapters to both the water heater nipples and the ends of the hot and cold water pipes. This will make it easier to disconnect the water heater should you need to make repairs or replacements in the future. If you did not already have them, now is a good time to install flexible tubes to connect the hot and cold water pipes to the water heater. It may require some sweat-soldering with a torch if you have copper pipes, but there are compression fittings, grip-fit (SharkBite) fittings, and PEX fittings that can also work with different types of plumbing pipes. How you do this will depend on the types of pipe you have and the configuration of the plumbing. You may need to assemble various threaded adapters, short lengths of pipe, and union fittings to join the water heater nipples to the cold and hot water pipes. But if the water pipes were hard-piped into the water heater and required cutting to remove the heater, then the job is a little more complicated. In some cases, this can be as easy as reconnecting the flexible tubes that you disconnected when removing the old heater. Easily installed, since all homes have electricity. Doesn’t go out due to an extinguished pilot light like a gas water heater. Less expensive than gas furnaces (850-1500) Nearly 100 efficient (no on-site energy loss) Wide range of tank sizes. Now, connect the cold water pipe to the inlet nipple on the water heater and the hot water pipe to the outlet nipple. No combustive element (no carbon monoxide poisoning risk) Safe. Installation involves wrapping the threads with plumber's pipe-seal tape, then threading the nipples into the openings and tightening them with channel-lock pliers or a pipe wrench.
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