While electric dryers are common, gas dryers are often faster and can be more affordable depending on your local energy costs. In some cases, like the couple in the above video, gas dryers are the only option for a home.
However, working with gas appliances calls for specialized knowledge. In this guide, we’ll show you how to install a gas clothes dryer. This Old House plumbing and heating expert Richard Trethewey demonstrates the steps in the video above and highlights key considerations and safety measures.
How Do Gas Dryers Work?
Unlike their electric counterparts, gas dryers use natural gas or propane to generate heat. While they still require a 120-volt (V) electrical connection to power the drum motor and controls, the primary heat source is burning gas.
Benefits of Gas Dryers
Gas dryers offer several advantages over electric models:
- Faster drying times
- Lower operating costs in many areas
- More powerful heating capabilities
- Potential for improved energy efficiency
Safety Considerations
Working with gas appliances has inherent risks. You should prioritize safety throughout the installation by doing the following:
- Always shut off the gas supply before beginning work
- Make sure you have proper ventilation to prevent gas buildup
- Test all connections for leaks before operating the dryer
- Use the appropriate tools and materials designed for gas line work
Preparing for Gas Dryer Installation
You’ll need to take the following steps before installing a gas dryer to ensure a smooth, safe process.
Assess Your Space
Evaluate the designated area for your dryer by doing the following:
- Check for adequate clearance around the dryer for proper airflow
- Identify a good location for venting to the outside
- Locate the nearest gas line and electrical outlet
- Measure the space to ensure the dryer will fit
Gather Necessary Materials
Collect all your materials and tools before beginning the installation:
- Drill with hole saw attachment (for creating vent opening)
- Dryer vent and clamps
- Flexible gas connector
- Gas leak detector
- Gas pipes and fittings
- Pipe dope or thread sealant
- Wrenches and screwdrivers
Installing the Gas Line
The gas line installation is a major part of the process and should only be performed by a licensed professional.
Shut Off the Gas Supply
Before any work begins, shut off the gas supply with the following steps:
- Check that gas flow has stopped by attempting to turn on a gas appliance
- Locate the main gas shutoff valve, typically near the meter
- Use a wrench to turn the valve to the closed position
Run the Gas Pipe
In the video above, Richard demonstrates the process of running the gas pipe. Here are the key steps:
- Measure and plan the route for the gas pipe from the source to the dryer location
- Cut and thread pipes to the appropriate lengths, or buy pre-cut length pipes
- Apply pipe dope to all threaded connections
- Assemble the pipe sections, fittings, and valves
- Secure the pipes to walls or joists using appropriate hangers
Install a Drip Cap
A drip cap is an important safety feature in gas line installations. Here’s what to do with it:
- Place the drip cap at the lowest point of the vertical pipe run (this allows for the collection and removal of any condensation or debris in the line)
- Ensure the drip cap is easily accessible for future maintenance
Venting a Gas Dryer
Good venting is crucial for your gas dryer to work safely and efficiently. Choose a vent that meets local building codes and manufacturer specifications, and consider the following:
- Avoid flexible plastic venting, which can trap lint and pose a fire hazard
- Ensure the vent diameter matches the dryer’s output
- Use rigid metal ductwork whenever possible
Install the Vent
Follow these steps to install the dryer vent:
- Connect the ductwork from the dryer to the vent hood
- Cut a hole in the exterior wall using a hole saw
- Determine the shortest and most direct route to the exterior of the home
- Install the vent hood on the exterior, creating a tight seal
- Secure all connections with metal tape or clamps
Connecting the Gas Dryer
With the gas line and venting in place, you can now connect the dryer itself.
Position the Dryer
Carefully move the dryer into its designated location:
- Ensure the dryer is level to prevent excessive vibration while it’s on
- Leave enough space behind the unit for the gas connection and vent
Attach the Gas Line
Connect the flexible gas connector to the dryer with these steps:
- Apply pipe dope to the threaded connection on the dryer
- Attach one end of the flexible connector to the dryer
- Connect the other end to the gas supply line
- Tighten all connections securely with wrenches
Connect the Vent
Then, attach the vent ductwork to the dryer:
- Make sure the vent is not kinked or crushed
- Secure the connection with a metal clamp
- Slide the vent duct over the dryer’s exhaust outlet
Testing and Safety Checks for Gas Dryers
After installation, thoroughly test the dryer to make sure it’s working correctly.
Check for Gas Leaks
Use a gas leak detector to check all connections:
- Apply a leak detection solution or use an electronic detector on all joints and fittings
- Look for bubbles or listen for the detector’s alarm, indicating a leak
- If a leak is found, tighten connections or replace faulty components as needed
- Turn on the gas supply
Check That the Dryer is Working
Test to confirm that everything works with these steps:
- Check that hot air is flowing from the vent hood outside
- Plug the dryer into the electrical outlet
- Start the dryer and listen for the ignition of the gas burner
- Turn on the gas supply if it was shut off during leak testing
