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A point-of-use water heater has a built-in thermostat with auto shut-off so it doesn't run when it reaches the desired temperature. This system has a small tank that mounts under the sink, which holds the hot water unit it's needed.
Before installing a point-of-use system, time how long it takes to fill up a one-gallon bucket using a faucet at the greatest distance from the water heater. Next, record the time it takes to get hot water. Multiply the two numbers together, then multiply that number by 10 (average number of uses per day). This will give the number of gallons wasted every day waiting on hot water.
Note: Be sure to follow the local plumbing codes before installing a point-of-use water heater.
Clean out the area under the sink if needed.
Next, shut off the water under the sink. Turn off the electricity to the area at the breaker.
Note: Use pressure relief valves and drip legs to run this system safely.
Using an adjustable wrench, loosen the nut around the hot water stop.
Remove the line from the valve. Loosen the line running from the faucet using slip-joint pliers, then remove.
Attach stainless flex-lines to the faucet connection; tighten the connection using a wrench.
Next, attach another flex-line to the hot water angle-stop and tighten.
Place the tank under the sink.
Attach 1/2" to 3/8" flex-line from the hot water line to the cold water intake on the tank.
Using a 1/2" to 3/8" flex-line, connect the faucet to the hot water connection on the tank.
Turn the water and power back on. Next, check the area for leaks.
Turn on the faucet to purge the air from the water line.
Plug the point-of-use system in under the sink. If a plug is not installed, have an electrician install one.
Set the desired temperature on the system.