How to Wire a Instantaneous Water Heater

How to Wire a Instantaneous Water Heater

When you replace an old tank-style water heater with an instantaneous one, you’ll have to wire the new system to your existing wiring. In some locations, this can be a complex project that requires knowledge of plumbing and electrical skills. In other cases, you’ll need to hire a licensed electrician.

First, turn off the circuit breaker that supplies power to your water heater. In most cases, this is a 30-amp, double-pole breaker. Then, use a non-contact voltage tester to check the circuit’s power supply.

Next, connect the hot and cold water lines to the water heater’s internal connections. The hot water line should go to the right side of the unit, and the cold water should come out of the left. The easiest way to make these connections is with stainless steel flex pipe and Teflon tape, but copper tubing (rated for high temperature applications) or PEX tubing also work.

Cut the Cold Water Supply Line: Before you start making connections, cut the cold water supply line near the heater’s installation area with tube cutters. Then, insert a Y-fitting into the cut portion of the pipe and solder it in place. This ensures that the water will flow smoothly through the fitting and into the piping system.

Once the Y-fitting is in place, you can make final connections to the cold and hot water pipes. These connections will go in and out of the water heater and distribute hot water to outlets throughout your home.

Establish the Cold and Hot Water Connections: Depending on the model you’re replacing, you may need to install a filter screen at the cold water inlet or use a special swivel connector for the hot water outlet. This is especially true with models that have an electronic recirculation pump. You’ll also want to install a shut-off valve on the cold water side and hot water side before and after the unit. This prevents you from tripping the breaker when you’re doing maintenance and will help save electricity in the long run.

Mount the Water Heater: Follow the manufacturer’s instructions to securely mount the new unit to your wall. The instructions are usually printed on the packaging, so follow them to the letter.

Before you begin installing the unit, check with your local building code to determine if a permit is required. In some places, you’ll need a permit before you can install the unit or connect it to the existing water line.

You will also need to replace any existing gas lines and connections. The new tankless water heater uses more gas than your current tank style water heater, so you’ll need to run a new line from the main gas meter to the unit’s location. Unless you have extensive experience with gas pipe connections, it’s best to leave this task to a professional plumber or licensed electrician.

Test Your Wiring: Before you touch any parts of your new water heater, be sure to test the voltage. This is important because you could void your warranty if you mess with the wiring and there’s a live circuit somewhere.

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