Navien mixing valve replacement made easy: a comprehensive guide for homeowners

Are you facing issues with your Navien water heater’s temperature regulation? If so, replacing the mixing valve may be the solution. This comprehensive guide will walk you through the process of replacing a Navien mixing valve step-by-step, empowering you to tackle this task with confidence.

Tools and Materials

Before you begin, gather the following tools and materials:

• Adjustable wrench
• Basin wrench
• Plumber’s putty
• Teflon tape
• New Navien mixing valve
• Rags or towels

Safety Precautions

Before starting any plumbing work, ensure that the gas and water supply to the water heater are turned off.

Step-by-Step Instructions

1. Locate and Isolate the Mixing Valve

Identify the mixing valve, which is typically located near the bottom of the water heater. Use an adjustable wrench to close the hot and cold water supply valves connected to the valve.

2. Remove the Old Mixing Valve

Using a basin wrench, loosen the nut connecting the mixing valve to the water heater. Be careful not to overtighten or damage the threads. Remove the old mixing valve.

3. Apply Plumber’s Putty

Apply a thin layer of plumber’s putty around the threads of the new mixing valve. This will help create a watertight seal.

4. Install the New Mixing Valve

Screw the new mixing valve into the water heater by hand until it is snug. Then, use the basin wrench to tighten it further, but avoid overtightening.

5. Wrap Teflon Tape

Wrap several layers of Teflon tape around the male threads of the temperature control handle. This will prevent leaks when the handle is connected.

6. Install the Temperature Control Handle

Screw the temperature control handle onto the mixing valve. Tighten it until it is secure, but do not overtighten.

7. Open the Water Supply

Slowly open the hot and cold water supply valves. Check for leaks around the mixing valve and temperature control handle. If any leaks occur, tighten the connections further.

8. Adjust the Temperature

Turn on a hot water faucet and adjust the temperature control handle until the desired temperature is reached.

Troubleshooting

1. Leaking Mixing Valve

• Check the tightness of the mixing valve connections.
• Replace the plumber’s putty if it is cracked or damaged.
• Inspect the O-rings on the mixing valve for wear or damage.

2. Water Not Hot Enough

• Ensure that the hot water supply valve is fully open.
• Adjust the temperature control handle to a higher setting.
• Check the gas supply to the water heater.

3. Water Too Hot

• Adjust the temperature control handle to a lower setting.
• Check the temperature sensor on the water heater.
• Flush the water heater to remove sediment.

The Bottom Line

Replacing a Navien mixing valve is a straightforward task that can be completed with the right tools and knowledge. By following the steps outlined in this guide, you can restore your water heater’s temperature regulation and enjoy a comfortable and efficient hot water supply.

Frequently Asked Questions

1. How often should I replace my Navien mixing valve?

Replace the mixing valve every 5-7 years or if it shows signs of wear or damage.

2. Can I use any mixing valve for my Navien water heater?

No, you must use a Navien-specific mixing valve designed for your model.

3. What are the signs of a failing mixing valve?

Signs include leaking, inconsistent water temperature, or water that is too hot or too cold.

4. How do I know if I have the right temperature control handle?

The correct handle will have a red indicator line and will be compatible with your Navien water heater model.

5. Can I replace the mixing valve without turning off the gas supply?

No, it is essential to turn off the gas supply before starting any plumbing work.