Installing a Rinnai tankless water heater can provide efficient and cost-saving water heating for your home. However, the installation process can be challenging and potentially dangerous. That's why it is highly recommended to have a licensed professional plumber handle the installation. Before starting the installation, familiarize yourself with local plumbing and electrical codes as they can vary. You will need tools such as a pipe wrench, drill/driver, and keyhole saw.
If you are replacing an old water heater tank, you'll need to remove it before installing the new tankless water heater. Turn off the water supply and gas supply valves, drain the old water heater, and disconnect the water and gas lines. Dispose of the old water heater according to local regulations.
Mount the new water heater securely on a wall using a sturdy mounting box made of 2 x 4 lumber and 3/4-inch plywood. Ensure proper venting by following the manufacturer's instructions for your specific model of tankless water heater. Install the gas line, connecting it to the new water heater's gas line. Connect the water supply lines, soldering the copper pipes as needed.
Install the pressure relief valve and the exhaust vent according to the manufacturer's instructions. Turn on the water supply and check for leaks. Turn on the gas, bleed the line if necessary, and check for leaks. Finally, turn on the power and follow the manufacturer's specific startup procedures.
Proper installation is crucial for the safe and efficient operation of your Rinnai tankless water heater. Consider hiring a licensed professional to ensure proper setup and operation.
Key Takeaways:
- Installing a Rinnai tankless water heater is a complex task that should be handled by a licensed professional plumber.
- Familiarize yourself with local plumbing and electrical codes before starting the installation process.
- Remove the old water heater before installing the new tankless water heater.
- Mount the new water heater securely on a wall and ensure proper venting.
- Connect the gas line, water supply lines, pressure relief valve, and exhaust vent according to the manufacturer's instructions.
Upgrade Your Gas Line
When installing a tankless water heater, one important aspect to consider is the upgrade of your gas line. Unlike traditional water heaters, tankless models require a higher gas flow rate to heat water on-demand. This means that your existing gas line may not be sufficient to handle the increased gas demand, potentially leading to performance issues or even safety hazards.
To ensure proper operation and efficiency, it is recommended to upgrade your gas line when installing a tankless water heater. Most standard gas lines are typically 1/2-inch in diameter, but for a tankless water heater, it is recommended to increase the size of the gas pipe to 1 inch. This larger diameter pipe allows for a greater volume of gas to flow through, meeting the requirements of the tankless water heater and preventing any gas pressure issues.
Upgrading your gas line is not a DIY task and should be handled by a licensed professional contractor. They will have the expertise and knowledge to properly size and install the new gas line, ensuring a safe and reliable connection to your tankless water heater. Additionally, a professional can also help you navigate any local plumbing and building codes that may apply to your specific installation.
Benefits of Upgrading Your Gas Line
- Ensures sufficient gas flow for optimal performance
- Prevents potential safety hazards due to inadequate gas supply
- Complies with local plumbing and building codes
- Maximizes the efficiency and lifespan of your tankless water heater
By upgrading your gas line, you can ensure that your tankless water heater operates at its best, providing you with a continuous supply of hot water whenever you need it.
https://www.youtube.com/watch?v=DWiNguUhNoE
Remove the Old Water Heater
Before installing a new tankless water heater, it is necessary to remove the old water heater. This process involves disconnecting the water lines, draining the tank, and disposing of the old unit according to local regulations. Follow these steps to effectively remove your old water heater:
- Turn off the water supply and gas supply valves to the water heater. This will prevent any water or gas from flowing into the unit during the removal process.
- Attach a hose that is rated for hot water to the drain valve of the old water heater. Direct the other end of the hose to a suitable drain location. Open the drain valve to allow the tank to empty completely.
- Disconnect the water lines from the old water heater. Use adjustable wrenches to loosen and remove the fittings. Be careful as there may still be some water in the lines.
- Disconnect the gas line from the water heater using a pipe wrench. Ensure that the gas supply is turned off before disconnecting the line.
- Properly dispose of the old water heater according to local regulations. Contact your local waste management facility for guidelines on how to dispose of large appliances.
By following these steps, you can safely and effectively remove your old water heater in preparation for installing a new tankless water heater.
Table: Steps to Remove the Old Water Heater
Step Description 1 Turn off the water supply and gas supply valves to the water heater. 2 Attach a hose to the drain valve and drain the tank. 3 Disconnect the water lines from the old water heater. 4 Disconnect the gas line from the water heater. 5 Dispose of the old water heater according to local regulations.
Follow these steps to effectively remove your old water heater before installing a new tankless water heater.
Mount the Water Heater
When installing a tankless water heater, it is essential to mount it securely on a wall to ensure stability and proper operation. Follow these steps to mount your tankless water heater:
Step 1: Venting
Before mounting the water heater, it's important to consider the venting requirements. Tankless gas water heaters should be direct-vented, meaning they require piping directly to the outside rather than through a chimney. Make sure to follow the manufacturer's instructions for venting your specific model of tankless water heater.
Step 2: Mounting Box Construction
To create a sturdy mounting box for the water heater, use 2 x 4 lumber and 3/4-inch plywood. Build a box that securely holds the water heater four inches away from the wall. Attach the mounting box to the wall using appropriate anchors to ensure stability.
Step 3: Attaching the Water Heater
Once the mounting box is in place, follow the manufacturer's specifications to securely attach the tankless water heater to the mounting box. Make sure all connections are tight and secure to prevent any potential leaks or issues during operation.
Step Description 1 Ensure proper venting according to manufacturer's instructions. 2 Construct a sturdy mounting box using 2 x 4 lumber and 3/4-inch plywood. 3 Attach the mounting box to the wall using appropriate anchors. 4 Securely attach the tankless water heater to the mounting box according to manufacturer's specifications.
Following these steps will help ensure that your tankless water heater is securely mounted and ready for operation.
Install the Gas Line
Proper installation of the gas line is essential for the safe and efficient operation of your Rinnai tankless water heater. If you are not experienced in making gas pipe connections, it is highly recommended to hire a licensed contractor who can ensure the installation is done correctly.
Start by determining if your current gas line is adequately sized to accommodate the increased gas flow required by the tankless water heater. If necessary, you may need to upgrade the size of your gas pipe from 1/2-inch to a 1-inch line to ensure proper gas supply.
Next, follow the manufacturer's instructions for installing the gas line. Use threaded black iron pipe to continue the gas line to the new tankless water heater. Install a gas shut-off valve, tee, and sediment trap according to the manufacturer's specifications. Make sure to use thread sealant designed for gas lines and check for any leaks before turning on the gas.
Gas Line Installation Checklist:
- Ensure your current gas line is adequately sized or upgrade to a larger line if necessary.
- Use threaded black iron pipe to continue the gas line to the new tankless water heater.
- Install a gas shut-off valve, tee, and sediment trap according to the manufacturer's instructions.
- Use thread sealant designed for gas lines and check for leaks before turning on the gas.
Gas Line Sizing Gas Pipe Material Gas Line Diameter Maximum BTU Rating Pressure Drop (inches of water column) Residential Black Iron or Copper 3/4 inch 100,000 - 400,000 BTU 0.6 - 0.9 inch Commercial Black Iron 1 inch 400,000 - 1,000,000 BTU 1 - 2 inches
By following these guidelines and ensuring proper installation of the gas line, you can ensure the safe and efficient operation of your Rinnai tankless water heater.
Install New Water Lines
When installing a Rinnai tankless water heater, it is essential to properly connect the water supply lines to ensure smooth water flow and prevent leaks. Here are the steps to install new water lines for your tankless water heater:
- Prepare the copper piping: Cut the copper pipes to the appropriate length, ensuring they reach from the water supply to the new water heater. Use a pipe cutter to make clean, straight cuts.
- Clean the pipes: Use sanding cloth to clean the pipes thoroughly. This step is crucial for creating a good solder joint.
- Apply flux: Apply flux to the fittings and pipe ends. Flux helps the solder flow smoothly and creates a strong bond.
- Connect the pipes: Join the pipe sections together using solder. Heat the joint with a propane torch until the solder melts and flows into the joint. Remove the torch and allow the joint to cool.
- Secure the pipes: Use bell hangers or other appropriate pipe supports to secure the pipes to the wall. This prevents excessive movement and reduces the risk of leaks in the future.
It is important to follow local plumbing codes and regulations when installing water lines. If you are not comfortable with soldering copper pipes or unsure about local codes, it is recommended to consult a licensed professional plumber for assistance.
https://www.youtube.com/watch?v=MIZNEGwRekE
Install the Pressure Relief Valve
One crucial component of every water heater installation is the pressure relief valve. This valve is responsible for ensuring the safety of the system by releasing excess pressure if it builds up inside the tank. The pressure relief valve should be installed according to the manufacturer's instructions to ensure proper functionality.
To install the pressure relief valve, first, locate the valve port on the side or top of the tank. Clean the threads on the port and wrap them with Teflon tape to ensure a tight seal. Screw the pressure relief valve into the port, making sure not to over-tighten it. The valve should fit snugly but still be easily operable.
After installing the pressure relief valve, it is important to test it to ensure its proper functioning. Simply lift the valve lever for a few seconds to allow some water to flow out. This will help verify that the valve is working correctly and can relieve pressure when necessary. If any issues are detected during the test, consult the manufacturer's manual or seek professional assistance.
Pressure Relief Valve Installation Steps:
- Locate the valve port on the water heater tank.
- Clean the threads on the port and wrap them with Teflon tape.
- Screw the pressure relief valve into the port, ensuring a tight seal without over-tightening.
- Test the valve by lifting the lever to allow water to flow out momentarily.
Tip Warning Always follow the manufacturer's instructions when installing the pressure relief valve. Do not obstruct or tamper with the pressure relief valve. It is a vital safety component of the water heater system.
Table: Pressure Relief Valve Installation Tips and Warnings
Ensure the safety of your water heater system by properly installing the pressure relief valve. Follow the manufacturer's instructions, test the valve, and never tamper with or obstruct its operation.
Install the Exhaust Vent
Proper venting is essential for the safe and efficient operation of a tankless water heater. The exhaust vent removes combustion gases from the unit and must be installed correctly to prevent any potential hazards. Follow these steps to ensure proper venting of your tankless water heater:
- Refer to the manufacturer's instructions: Each tankless water heater model may have specific venting requirements. Carefully read and follow the manufacturer's instructions for your particular unit to ensure proper installation.
- Obtain a vent kit: Purchase a vent kit designed for your tankless water heater model. These kits typically include all the necessary components, such as the vent pipe, elbow, and vent hood, to facilitate proper venting.
- Apply heat-resistant sealant: Use heat-resistant silicone sealant to create an airtight seal between the vent shaft and the vent pipe. Apply the sealant as per the manufacturer's instructions and secure it with a hose clamp.
- Install the vent pipe: Attach the vent pipe to the water heater according to the manufacturer's specifications. If needed, drill a hole from the inside through the joist or wall to allow for venting to the outside.
- Create the vent hole: Outline a circle on the outside wall where the vent hole will be located. Carefully cut out the vent hole using appropriate tools. Take caution to avoid damaging any existing structures or materials.
- Secure the vent flange: Position the vent flange over the vent hole and secure it to the wall using screws. Apply silicone caulk around the edges to ensure a watertight seal.
- Connect the vent pipe: Attach the vent pipe to the vent flange and secure it firmly. Follow the manufacturer's instructions for proper connection methods, such as using screws or clamps.
- Install the vent hood: Place the vent hood on the exterior end of the vent pipe. Ensure it is securely attached and positioned correctly to prevent any obstructions.
https://www.youtube.com/watch?v=chxT37sh_cQ
Summary
Proper venting is a crucial aspect of installing a tankless water heater. By following the manufacturer's instructions and using a vent kit designed for your specific model, you can ensure safe and effective venting. Remember to seal all connections with heat-resistant silicone and secure the vent pipe and hood firmly. Following these steps will help ensure your tankless water heater operates properly and efficiently.
Turn on the Water
Once you have successfully installed your Rinnai tankless water heater, it's time to turn on the water and start enjoying the benefits of instant hot water. However, before doing so, it is important to purge any trapped air from the water pipes to ensure optimal performance.
To purge air from the water pipes, open a faucet near the water heater. This will allow air to escape as the water begins to flow. Keep the faucet open until a steady stream of water is flowing without any sputtering or air bubbles. Once you have purged the air, you can close the faucet and proceed with turning on the water heater.
Before plugging in the water heater, it is recommended to insulate the hot water pipe to minimize heat loss. This will help improve energy efficiency and reduce standby heat loss. Additionally, insulating the hot water pipe can help prevent the pipe from freezing in colder climates.
Once you have insulated the pipe, plug in the water heater and follow the manufacturer's specific startup procedures. This may include adjusting temperature settings, setting timers or schedules, and familiarizing yourself with the controls and features of the unit. It is important to read the manufacturer's instructions carefully to ensure proper setup and operation of your tankless water heater.
Purging Air from Water Pipes
- Open a faucet near the water heater to purge any air from the pipes.
- Keep the faucet open until a steady stream of water flows without sputtering or air bubbles.
- Close the faucet once the air is purged.
Run Power for the Unit
When it comes to running power for your tankless water heater, it’s important to ensure safe and proper installation. The electrical power required for a tankless water heater varies based on the model and voltage. Most tankless water heaters require either a dedicated 120-volt or 240-volt circuit.
For a 240-volt unit, you will need to use 8-gauge wire to connect the heater to a double-pole breaker in your electrical panel. The white wire should be connected to one hot terminal, the black wire to the other hot terminal, and the ground wire should be connected to the grounding screw on the unit. It is important to adhere to the National Electrical Code and follow the manufacturer's instructions for proper wiring installation.
If you have a 120-volt unit, the wiring process is similar. Twist the white supply wire to the white wire in the unit and the black wire to the black wire. Secure the wire connections with wire caps and tape them in place. As with the 240-volt unit, it is crucial to follow the manufacturer's instructions and comply with the National Electrical Code to ensure safe and efficient operation of your tankless water heater.
Table: Electrical Power Requirements for Tankless Water Heaters
Tankless Water Heater Voltage Wire Gauge Breaker Size 240-Volt 8-Gauge Double-Pole 120-Volt 10-Gauge Single-Pole
Under-Sink Tankless Water Heater Installation: A Step-by-Step Guide
When it comes to installing a tankless water heater under your sink, it's essential to follow the correct procedures to ensure a successful installation. In this guide, we will provide a step-by-step overview of the installation process, including water line connections and other key considerations.
1. Prepare the Area
Before beginning the installation, make sure to clear the area under the sink and ensure there is enough space for the tankless water heater. Remove any existing plumbing fixtures or obstructions that may interfere with the installation process. This will ensure a smooth and hassle-free installation.
2. Connect the Water Lines
Once the area is prepared, it's time to connect the water lines. Begin by shutting off the main water supply to the sink. Connect the cold water line to the appropriate inlet on the tankless water heater and secure it tightly using a wrench. Repeat the process for the hot water line, connecting it to the outlet on the water heater. Ensure all connections are secure and leak-free.
3. Test for Proper Functioning
After the water lines are connected, it's crucial to test the tankless water heater for proper functioning. Turn on the main water supply and check for any leaks or drips. Open the hot water faucet to purge any air from the system. Once the water flows smoothly and without interruption, you can be confident that the installation is successful.
By following these steps, you can confidently install a tankless water heater under your sink, ensuring efficient and reliable hot water supply for your everyday needs.
Pros of Under-Sink Tankless Water Heater Installation Cons of Under-Sink Tankless Water Heater Installation
- Saves space as it eliminates the need for a large water heater tank
- Provides instant hot water without the need for waiting or wastage
- Energy-efficient, reducing overall utility costs
- Durable and long-lasting
- May require professional installation for complex plumbing connections
- Higher initial cost compared to traditional water heaters
- May have limited capacity for larger households
- Requires regular maintenance to prevent mineral buildup
Screw the Unit to the Wall
Now that we have mounted the tankless water heater securely, it's time to connect the water lines and ensure a tight fit. Proper installation of the water lines is essential to prevent leaks and ensure a reliable water supply. Let's take a look at the steps involved in connecting the water lines.
Water Line Connections
1. Begin by connecting the water supply line to the cold in-feed fitting of the tankless water heater. Use soldered copper pipe or high-pressure flex connections, depending on your specific installation requirements.
2. Apply Teflon tape to the threads of the water supply line before making the connection. This will help create a tight seal and prevent leaks. Use a wrench to tighten the connection securely.
3. Next, connect the line leading to the faucet to the hot water outlet of the tankless water heater. Again, use soldered copper pipe or high-pressure flex connections, depending on your setup.
4. Apply Teflon tape to the threads of the hot water line and tighten the connection with a wrench. Ensure that the connection is tight to avoid any leaks.
By following these steps, you can securely connect the water lines to your tankless water heater. Remember to use appropriate materials and ensure proper sealing to prevent leaks and ensure reliable water flow.
Step Instructions 1 Connect the water supply line to the cold in-feed fitting of the tankless water heater using soldered copper pipe or high-pressure flex connections. 2 Apply Teflon tape to the threads of the water supply line and tighten the connection with a wrench. 3 Connect the line leading to the faucet to the hot water outlet of the tankless water heater using soldered copper pipe or high-pressure flex connections. 4 Apply Teflon tape to the threads of the hot water line and tighten the connection with a wrench.
Wire the Unit
Now that the tankless water heater is securely mounted and the gas and water lines are installed, the next step is to wire the unit. The electrical wiring will provide the necessary power for the water heater to function properly.
For a 240-volt unit: Connect the white wire to one hot terminal and the black wire to the other hot terminal. The ground wire should be connected to the grounding screw on the unit. Ensure that all connections are secure.
For a 120-volt unit: Twist the white supply wire to the white wire in the unit and the black wire to the black wire. Again, secure the wire connections with wire caps and tape them in place.
It is important to follow the manufacturer's instructions and comply with local electrical codes when wiring the unit. If you are not familiar with electrical work, it is advisable to hire a licensed electrician to ensure the wiring is done correctly and safely.
Conclusion
Installing a Rinnai tankless water heater can provide efficient and cost-saving water heating for your home. However, it is important to follow proper installation procedures and consider hiring a licensed professional for the job.
Upgrading the gas line, removing the old water heater, mounting the new water heater securely, installing the gas line and water lines, and ensuring proper venting are all essential steps in the installation process.
Additionally, proper wiring and startup procedures are necessary to ensure the tankless water heater operates correctly. By following the guidelines and recommendations provided in this guide, you can successfully install a Rinnai tankless water heater in your home.
FAQ
Is it dangerous to install a tankless gas water heater on my own?
Installing a tankless gas water heater can be challenging and potentially dangerous. It is highly recommended to have a licensed professional plumber handle the installation.
What tools do I need for the installation?
The tools needed for installation include a pipe wrench, drill/driver, and keyhole saw. If you are replacing a water heater with a tank, you will also need a hand truck for removal.
Do I need to upgrade my gas line for a tankless water heater?
Tankless water heaters require more gas when firing up than a water heater with a tank. This may necessitate upgrading your gas line to accommodate the increased gas flow. It is recommended to hire a licensed contractor to handle the gas line upgrade.
How do I remove the old water heater?
Start by turning off the water supply and gas supply valves to the water heater. Drain the old water heater using a hose rated for hot water. Disconnect the water lines and gas line from the old water heater. Dispose of the old water heater according to local regulations.
How should I mount the tankless water heater?
Tankless gas water heaters need to be mounted securely on a wall. They should be direct-vented, which means they need to be piped directly to the outside and not through a chimney. Follow the manufacturer's instructions for venting your specific model of tankless water heater.
How do I install the gas line?
If you are not familiar with making gas pipe connections, it is best to hire a licensed contractor for this task. If your current gas line is adequately sized, you can continue the line to the new tankless water heater using threaded black iron pipe. Install a gas shut-off valve, tee, and sediment trap following the manufacturer's instructions.
How do I connect the water supply line?
Connect the water supply line to the water heater valves using the manufacturer's instructions. Tie in the new hot and cold water lines to the existing lines using copper pipe. Cut and solder the copper piping as needed to connect it to the new water heater.
Do I need to install a pressure relief valve?
Every water heater requires a pressure relief valve for safety purposes. Install the pressure relief valve and purge valve according to the manufacturer's instructions.
How do I properly vent the tankless water heater?
Venting a tankless gas water heater is crucial for proper operation. Follow the manufacturer's instructions and use a vent kit specifically designed for your model of water heater. Apply heat-resistant silicone sealant to the vent shaft and secure it with a hose clamp.
What should I do after installing the water heater?
Open a faucet to purge air from the water pipes and the water heater. Plug in the water heater and insulate the hot water pipe. Turn on the gas and follow the manufacturer's specific startup procedures. It is recommended to have a licensed professional handle the tankless water heater installation to ensure proper setup and operation.
How do I run power for the tankless water heater?
To power the tankless water heater, you will need a dedicated 120 or 240-volt circuit. Both voltages require 8-gauge wire, with the section exposed under the sink requiring armored cable. Follow the manufacturer's instructions and comply with the National Electrical Code for proper wiring installation.
Can I install a tankless water heater under a sink?
If you are installin
