How To Install A Tankless Water Heater

Posted on: 20 September 2014

A tankless water heater heats the water as it runs through this device, rather than heating the water while it's stored in a tank. The primary advantages of a tankless water heater are that it's smaller and requires less energy to operate than a water heater with a tank. The following steps for installing a tankless water heater require experience with soldering copper pipes and wiring electrical devices.

Step 1. Cut the copper pipe.

Measure the distance from the nearest water outlet to the water heater's inlet valve. Cut a piece of copper pipe to this length with a rotating pipe cutter.

Remove the burrs from both ends of the copper pipe with 120-grit Emery cloth. Polish the insides of the fittings with a wire brush to ensure that you have clean joining surfaces on both the pipe and the pipe fittings.

Step 2. Install the pipe clips.

Apply copper flux on the joining surfaces for the pipe and fittings. Fit the copper pipe into place, and mark the locations where you'll install the pipe clips to fasten the pipe to the wall.

Use a drill with a mortar bit to drill the holes into the wall for the expansion anchors. Place the pipe clips around the pipe, and install the expansion anchors to fasten the pipe clips to the wall.

Step 3. Sweat the copper pipe.

Solder the ends of the copper pipe to its fittings on the outlet for your water supply and the water inlet on the water heater. This process generally involves heating the fitting to draw the solder into the pipe joint rather than heating the joint itself.

Step 4. Connect the electrical supply.

Connect the electrical wiring for the water heater to an electrical disconnect panel. This step generally involves connecting the positive, negative and ground wires from the water heater to the appropriate terminals on the disconnect panel. An electrician will need to install a disconnect panel if your house doesn't already have one.

Step 5. Test the water heater.

Open the valve on the water outlet, and allow water to run through the water heater for at least two minutes. Adjust the thermostat on the water heater to get your water to the desired temperature.

Call a contractor in your area that specializes in tankless water heater installation if you need a professional to perform this procedure. These contractors can also maintain and service water heaters in most cases.


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After we moved into a new home, I could tell that the plumbing system was having problems. Our drains never really drained quickly, and there was always the faint smell of sewage in the background. I knew that I wanted to fix the problem, but I didn't really know where to start. However, I knew that I didn't want to take care of the problem, so I called in the experts. My friend, who worked as a plumber, came out and worked hard to diagnose the issues. After we got things fixed, our house smelled and functioned better. This blog is all about diagnosing plumbing problems.


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