How to Install Tankless Gas Water Heater: Easy Guide

Steve Donaldson Master HVAC technician
Steve Donaldson
Master HVAC technician at Quality Comfort Home Services

I am Steve Donaldson, a Master HVAC technician with a rich background in addressing heating issues, especially when it comes to various types of water heaters. Leveraging my extensive expertise, I offer insights and advice to help individuals maintain a warm and secure home environment. Reach out to me at steve.donaldson@tedreviews.com for valuable tips from a seasoned professional in the industry.

Steve Donaldson Master HVAC technician
Steve Donaldson
Master HVAC technician at Quality Comfort Home Services

I am Steve Donaldson, a Master HVAC technician with a rich background in addressing heating issues, especially when it comes to various types of water heaters. Leveraging my extensive expertise, I offer insights and advice to help individuals maintain a warm and secure home environment. Reach out to me at steve.donaldson@tedreviews.com for valuable tips from a seasoned professional in the industry.

Are you tired of running out of hot water in the middle of a shower? Or maybe you're looking to upgrade your current water heater to a more energy-efficient option? Whatever your reason may be, installing a tankless gas water heater can be a game-changer. But how exactly do you go about installing one?

In this easy guide, I will walk you through each step of the installation process, from upgrading the gas line to mounting the unit and installing the necessary connections. By the end of this article, you'll have all the knowledge and confidence you need to successfully install a tankless gas water heater in your home.

Key Takeaways:

  • Installing a tankless gas water heater requires following proper installation steps for safety and success.
  • Before starting the installation, ensure you have gathered all the necessary tools and checked local plumbing and electrical codes.
  • Upgrading the gas line is often required to accommodate the higher gas demand of a tankless water heater.
  • Properly removing the old water heater and mounting the tankless unit are essential steps in the installation process.
  • Installing the gas line, water lines, and exhaust vent are crucial for the proper functioning and safety of the tankless gas water heater.

Before Installing a Tankless Gas Water Heater

Before you embark on the installation process of your tankless gas water heater, there are several essential preparatory steps to take. These steps will help ensure a smooth installation and the optimal performance of your new water heater. Let's explore these tasks in detail:

1. Verify Local Plumbing and Electrical Codes

First and foremost, it is crucial to familiarize yourself with the local plumbing and electrical codes in your area. Compliance with these codes ensures the safety and legality of your installation. Take the time to research and understand the specific requirements for your region. If needed, consult a licensed professional to ensure all regulations are met and permits are obtained.

2. Gather the Required Tools

Before starting the installation, gather all the necessary tools that you'll need throughout the process. This might include a pipe cutter, wrench, tubing cutter, torque wrench, pipe dope, and various other plumbing tools. Having all the tools readily available will save you time and make the installation more efficient.

3. Ensure Proper Space for the Tankless Gas Water Heater

Since tankless gas water heaters require proper ventilation, it's important to ensure you have adequate space for the unit. Check the manufacturer's guidelines for the recommended clearance distances for installation. This includes both vertical and horizontal clearances. Also, make sure the location provides easy access for maintenance and servicing.

4. Check Gas Line Sizing

Before installing a tankless gas water heater, it's essential to confirm that your existing gas line can accommodate the increased gas demand. Improperly sized gas lines can lead to inadequate heating performance or even system failure. Consult a plumbing professional or refer to the manufacturer's specifications to determine if your gas line needs upgrading.

By completing these preparatory steps, you'll be well-prepared for a successful tankless gas water heater installation. In the next section, we will discuss how to upgrade your gas line to meet the demands of your new water heater.

Upgrade Your Gas Line

When installing a tankless gas water heater, it's essential to ensure that your gas line is properly upgraded to meet the higher gas demand. This will ensure optimal performance and efficiency of your new water heater. Here are the steps to follow:

Assess Current Gas Line Sizing:

First, you need to determine the size of your current gas line. The size of the line is usually measured in BTUs (British Thermal Units) per hour. You can find the BTU rating of your tankless water heater in the manufacturer's specifications.

To assess the sizing, you'll need to calculate the total BTU demand of your household appliances that use gas, including the new tankless water heater. It's essential to include other appliances like gas stoves, dryers, and furnaces in this calculation. If the total BTU demand exceeds the capacity of your current gas line, an upgrade will be necessary.

Determine the Need for Upgrade:

If the total BTU demand is higher than your current gas line's capacity, you'll need to upgrade the line. Upgrading the gas line involves increasing its size to accommodate the higher demand. A licensed gas contractor should assess and determine the appropriate size and materials needed for the upgrade. They will consider factors such as the length of the gas line, pipe diameter, and pressure requirements.

“Upgrading the gas line ensures the smooth and efficient operation of your tankless gas water heater while maintaining safety.”

Hire a Licensed Contractor:

It's essential to hire a licensed gas contractor to handle the gas line upgrade. Gas line installation and modifications should only be performed by qualified professionals to ensure safety and compliance with local plumbing codes. A licensed contractor will have the knowledge and expertise to properly assess, size, and install the gas line to meet the requirements of your tankless gas water heater.

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By upgrading your gas line, you can ensure that your tankless gas water heater functions at its best, providing an efficient and uninterrupted supply of hot water. Hiring a licensed contractor for the upgrade will give you peace of mind, knowing that the installation meets safety standards and the manufacturer's specifications.

Remove the Old Water Heater

If you're ready to upgrade to a tankless gas water heater, the first step is to remove the old water heater. Follow these simple steps to ensure a smooth and efficient removal process.

  1. Shut off the water supply: Begin by turning off the water supply to the old water heater. This will prevent any leaks or water damage during the removal process.
  2. Disconnect the water lines: Carefully disconnect the water lines from the old water heater. Start by turning off the valves on the supply lines, then use a wrench to loosen the connections and remove the lines.
  3. Disconnect the gas line: If your old water heater is gas-powered, you'll also need to disconnect the gas line. Follow the manufacturer's instructions for shutting off the gas supply, and use a wrench to disconnect the gas line from the water heater.
  4. Remove the old water heater: With the water and gas lines disconnected, it's time to remove the old water heater from its location. Enlist the help of a friend or family member to assist with lifting and maneuvering the unit.
  5. Properly dispose of the old water heater: Check with your local waste management or recycling center for guidelines on how to dispose of the old water heater. It's important to follow proper disposal procedures to ensure environmental safety.

By following these steps, you can safely remove the old water heater and prepare the space for the installation of your new tankless gas water heater. Remember to consult the manufacturer's instructions for specific guidance on removing your particular model of water heater.

remove old water heater

Mount the Water Heater

Properly mounting the tankless gas water heater is crucial for its stability and safety. When it comes to choosing the optimal location for mounting, there are a few key factors to consider. First, ensure that the designated area has sufficient space to accommodate the water heater and provides easy access for maintenance and repairs.

It is important to note that the manufacturer's instructions should always be followed when mounting the tankless water heater. These instructions will provide specific details on the required hardware and mounting methods for your particular model.

One common method for mounting a tankless water heater is to build a sturdy mounting box. This box serves as a secure foundation for the water heater and helps to distribute its weight evenly. Construct the box using strong, fire-resistant materials that can support the weight of the water heater. Make sure the dimensions of the box are appropriate for your specific model.

Once the mounting box is in place, securely attach the tankless water heater to the box using the recommended hardware, such as brackets or straps. Be sure to tighten all fasteners properly to prevent any movement or instability.

By following these steps and adhering to the manufacturer's instructions, you can ensure that your tankless gas water heater is mounted securely and ready for operation.

Key Points:

  • Choose an optimal location for mounting that provides sufficient space and easy access.
  • Follow the manufacturer's instructions for mounting the water heater.
  • Build a sturdy mounting box using strong, fire-resistant materials.
  • Securely attach the tankless water heater to the mounting box using recommended hardware.

Install the Gas Line

Connecting the gas line to your tankless water heater is a crucial step in the installation process. Follow these step-by-step instructions to ensure a safe and successful gas line installation.

  1. Shut off the gas supply: Before starting the installation, make sure to turn off the gas supply to the area where the tankless water heater will be installed. This ensures your safety during the installation process.
  2. Attach a shut-off valve: Begin by attaching a shut-off valve to the existing gas line. This valve will allow you to turn off the gas flow to the tankless water heater if needed in the future.
  3. Connect a tee: Next, connect a tee fitting to the shut-off valve. The tee fitting will allow for the gas line to be split, with one branch supplying the tankless water heater and the other branch continuing to supply other gas appliances.
  4. Install a sediment trap: It's important to install a sediment trap to prevent any debris or contaminants from reaching the tankless water heater. The sediment trap should be installed on the branch of the tee that connects to the tankless water heater.
  5. Seal all connections: To ensure a leak-free gas line, carefully seal all connections using approved gas-rated sealant or Teflon tape. This will help prevent any gas leaks and ensure the safe operation of your tankless water heater.
  6. Test for leaks: After installing the gas line, it's crucial to test for leaks. Apply a soapy water solution to all connections and check for any bubbles. If you notice any bubbles forming, there may be a gas leak present. In this case, you should immediately shut off the gas supply and consult a professional for further assistance.
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install gas line for tankless water heater

By following these steps, you can confidently install the gas line for your tankless water heater. Remember to always prioritize safety and consult a professional if needed.

Step Description
1 Shut off the gas supply
2 Attach a shut-off valve
3 Connect a tee
4 Install a sediment trap
5 Seal all connections
6 Test for leaks

Install New Water Lines

When replacing a traditional water heater with a tankless gas water heater, it is necessary to install new water lines. This crucial step ensures a proper and efficient water supply to your tankless water heater. Follow these water line installation steps to connect the water supply line to the water heater valves and run new hot and cold water lines.

  1. Shut off the main water supply to your home.
  2. Locate the water supply line leading to your old water heater and disconnect it. This line is typically connected to a shut-off valve.

  3. Connect the water supply line to the cold water inlet valve on your tankless water heater. Ensure a tight and secure connection.

  4. Run new hot and cold water lines from your tankless water heater to the fixtures in your home. You may need to solder copper pipes for a secure connection.
  5. Consider installing an expansion tank if necessary. An expansion tank helps absorb excess pressure that occurs when the water is heated, preventing damage to your plumbing system.

It is important to follow local plumbing codes and regulations during the installation of new water lines. If you are unsure about any step, consult a licensed plumber for assistance.

Recommended Tools for Water Line Installation

Tool Description
Adjustable wrench Used to tighten and loosen fittings
Pipe cutter Used to cut copper pipes to the desired length
Flux Used when soldering copper pipes for a secure connection
Torch Used to heat and melt solder for joining copper pipes
Expansion tank Used to absorb excess pressure in the plumbing system

Install the Exhaust Vent

Proper venting is essential for the safe operation of your tankless gas water heater. Without proper ventilation, the heater can produce harmful gases and pose a risk to your health. In this section, I will explain the various venting options available to you and provide detailed instructions on how to install the exhaust vent.

When it comes to venting your tankless water heater, one popular option is venting through the rim joist. This method involves running a vent pipe directly through the exterior wall using a hole drilled in the rim joist. By venting through the rim joist, you can minimize the length of vent pipe needed, ensuring efficient and effective ventilation.

To install the exhaust vent, start by locating the ideal spot on the rim joist for the vent hole. Then, using a drill and the appropriate-sized hole saw, carefully create the hole. Once the hole is made, secure a flange to the outside of the rim joist to provide a sturdy base for the vent pipe. Now, attach the appropriate vent pipe to the flange, ensuring a tight and secure connection.

Remember to consult manufacturer guidelines and local building codes to ensure you are using the correct materials and following all safety requirements. By following these instructions, you can confidently install the exhaust vent for your tankless water heater, ensuring proper ventilation and safe operation.

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FAQ

How do I install a tankless gas water heater?

Installing a tankless gas water heater involves several steps, including upgrading the gas line, removing the old water heater, mounting the new unit, connecting the gas line and water lines, and installing the exhaust vent. Each step requires careful attention to ensure a safe and successful installation. Consult the installation guide provided by the manufacturer for detailed instructions.

Where should a tankless water heater be installed?

A tankless water heater should be installed in a well-ventilated area with proper access to gas and water supply lines. It is important to consider the location's proximity to plumbing fixtures and electrical outlets, as well as the space required for maintenance and servicing. Additionally, local plumbing and electrical codes should be followed to ensure compliance and safety.

How hard is it to install a tankless water heater?

The difficulty of installing a tankless water heater can vary depending on your level of experience and familiarity with plumbing and gas line installations. While some homeowners may feel comfortable tackling the installation themselves, it is recommended to hire a licensed professional who is knowledgeable in handling gas and water lines to ensure a proper and safe installation.

How do I install an on-demand water heater?

Installing an on-demand water heater, also known as a tankless water heater, involves several steps. These include upgrading the gas line, removing the old water heater, mounting the new unit, connecting the gas line and water lines, and installing the exhaust vent. Each step requires careful attention to ensure a safe and successful installation. It is recommended to consult the installation guide provided by the manufacturer or hire a licensed professional for assistance.

How do I install an instant hot water heater?

The installation process for an instant hot water heater, also known as a tankless water heater, involves several steps. These include upgrading the gas line, removing the old water heater, mounting the new unit, connecting the gas line and water lines, and installing the exhaust vent. Each step requires careful attention to ensure a safe and successful installation. It is recommended to consult the installation guide provided by the manufacturer or hire a licensed professional for assistance.

Where do you install a tankless water heater?

A tankless water heater should be installed in a well-ventilated area that has proper access to gas and water supply lines. It is important to consider the proximity to plumbing fixtures and electrical outlets, as well as the space required for maintenance and servicing. Consult the manufacturer's guidelines for specific installation requirements and local plumbing and electrical codes to ensure compliance and safety.

How do I replace a tankless water heater?

To replace a tankless water heater, you will need to first shut off the water supply and disconnect the water and gas lines from the existing unit. Properly dispose of the old water heater and follow the installation steps for mounting the new unit, connecting the gas line and water lines, and installing the exhaust vent. It is recommended to consult the installation guide provided by the manufacturer or hire a licensed professional for assistance.

How do I connect a tankless water heater?

Connecting a tankless water heater involves several steps, including upgrading the gas line to accommodate the higher gas demand, mounting the unit, and connecting the gas line and water lines. It is important to follow the manufacturer's instructions and local plumbing codes for proper installation. If you are unsure, it is recommended to hire a licensed professional to ensure a safe and successful installation.

Steve Donaldson Master HVAC technician
Steve DonaldsonMaster HVAC technician at Quality Comfort Home Services

I am Steve Donaldson, a Master HVAC technician with a rich background in addressing heating issues, especially when it comes to various types of water heaters. Leveraging my extensive expertise, I offer insights and advice to help individuals maintain a warm and secure home environment. Reach out to me at steve.donaldson@tedreviews.com for valuable tips from a seasoned professional in the industry.

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