Replacing a tankless water heater can be a daunting task, but it is definitely possible to do it yourself with a little planning and preparation. In this article, we will walk you through the steps on how to replace a tankless water heater, from start to finish. We will also provide you with some tips and tricks to make the process easier.
Before you begin, it is important to gather all of the necessary materials, tools and protective gear. Additionally, you may need to ensure that you have the proper permits and permissions in place, depending on your local building codes and regulations.
Once you have everything you need, you can begin the process of removing the old tankless water heater. This typically involves disconnecting the water supply lines, gas lines, and electrical connections. Once the old water heater is removed, you can install the new one by following the included instructions. Finally, you will need to reconnect the water supply lines, gas lines, and electrical connections.
Electric Tankless Water Heater Replacement
Replacing an electric tankless water heater requires the following steps:
1. Safety Precautions
Turn off the electricity at the main breaker panel. Shut off the water supply to the water heater. Open a hot water faucet to relieve pressure in the system.
2. Disconnect the Electricity
Remove the cover plate from the electrical junction box. Disconnect the wires from the water heater. Cap the wires with wire nuts.
3. Disconnect the Water Lines
Use a wrench to disconnect the water supply and outlet lines from the water heater. Drain any remaining water from the lines.
4. Remove the Old Water Heater
Use a screwdriver to remove the mounting screws that secure the water heater to the wall. Carefully lift and remove the old water heater.
5. Install the New Water Heater
Place the new water heater in position on the wall. Secure it with the mounting screws. Connect the water supply and outlet lines to the water heater. Tighten the fittings with a wrench.
Electrical connections:
| Wire Color | Terminal |
|---|---|
| White | Neutral |
| Black | Live |
| Green or Bare Copper | Ground |
Restore electricity at the main breaker panel. Turn on the water supply to the water heater. Check for leaks at all connections. Adjust the temperature setting as desired.
Proper Vent Installation
Proper vent installation is crucial for the safe and efficient operation of a tankless water heater. Here are some specific considerations for venting a tankless water heater:
Vent Size
The vent pipe should be sized to match the capacity of the water heater. Undersized venting can restrict exhaust flow and lead to inefficiencies and potential safety hazards. Refer to the manufacturer’s specifications for the appropriate vent size.
Vent Material
Use approved vent material, such as PVC, CPVC, or stainless steel. Avoid using galvanized steel, as it can corrode and release harmful fumes. Make sure the vent material is rated for the temperature and exhaust output of the water heater.
Vent Length
Keep the vent length as short as possible while maintaining proper vertical and horizontal clearances. Excessive vent length can create back pressure, reduce efficiency, and potentially lead to exhaust issues.
Vent Orientation
Position the vent vertically to allow for natural exhaust flow. Horizontal sections of vent pipe should be kept to a minimum and sloped slightly upward to prevent condensation buildup.
Vent Termination
The vent must terminate outdoors, preferably at least 3 feet above the ground level. Ensure the vent outlet is protected from water infiltration and freezing conditions.
Vent Clearances
Follow manufacturer’s guidelines for vent clearances from combustible materials, windows, and other openings. Maintain a safe distance to prevent fire hazards and ensure proper exhaust flow.
| Clearance | Distance |
|---|---|
| From windows or doors | 1 foot |
| From combustible materials | 6 inches |
| From other vents | 12 inches |
| From ground level | 3 feet |
How To Replace A Tankless Water Heater
If your tankless water heater is no longer working, you may need to replace it. Replacing a tankless water heater is a job that can be done by a professional or a do-it-yourselfer with some plumbing experience. Here are the steps involved in replacing a tankless water heater:
- Turn off the water supply to the water heater.
- Turn off the gas supply to the water heater.
- Disconnect the water lines from the water heater.
- Disconnect the gas line from the water heater.
- Remove the old water heater from its mounting bracket.
- Install the new water heater in the mounting bracket.
- Connect the water lines to the new water heater.
- Connect the gas line to the new water heater.
- Turn on the water supply to the water heater.
- Turn on the gas supply to the water heater.
- Test the water heater to make sure it is working properly.
Safety First
Before you begin working on your water heater, be sure to take the following safety precautions:
- Wear safety glasses and gloves.
- Turn off the water supply to the water heater.
- Turn off the gas supply to the water heater.
- Allow the water heater to cool down before working on it.
Tools and Materials
You will need the following tools and materials to replace a tankless water heater:
- Wrench
- Pliers
- Screwdriver
- New water heater
- Mounting bracket
- Water supply lines
- Gas line
- Safety glasses
- Gloves
People Also Ask
What is the average lifespan of a tankless water heater?
The average lifespan of a tankless water heater is 10 to 15 years.
How much does it cost to replace a tankless water heater?
The cost to replace a tankless water heater will vary depending on the size and type of water heater you choose, as well as the cost of labor in your area. However, you can expect to pay between $1,000 and $2,500 for a new tankless water heater and installation.
Is it difficult to replace a tankless water heater?
Replacing a tankless water heater is not a difficult job, but it does require some plumbing experience. If you are not comfortable working with plumbing, it is best to hire a professional to replace your water heater.
