How to Install a Gas Dryer Vent Heat Exchanger

disconnected dryer vent
  • 2-4 hours
  • Intermediate
  • 600-1,200
What You'll Need
Heat exchanger
Gas dryer manual

Rather than having a dryer vent, a gas dryer condenser uses a heat exchanger which does not need to be vented. It is often known as a ventless dryer for this reason. If you are considering fitting one of these in your home, you will be glad to hear you no longer need to install a lot of pipework.

However, there are still things which need to be installed before you can get your gas dryer to properly exchange the heat it is using. For example, you will need to take care to ensure that the smell does not travel throughout the house. You may consider calling in a plumber, but this is not strictly necessary, as the installation is relatively simple and cheap. If you have some basic home improvement skills and follow a few simple guidelines, you can get the job done quickly and easily.

Step 1 – Make the Space

The first step is to make space within your gas dryer vent where the heat exchanger will sit. You will need to remove the vent from the dryer, so first turn the power off at the main circuit breaker. Then unscrew the panel which keeps the vent in place. Remove the connection between the vent and the dryer located just on the inside of the vent. Clear away any debris collected there.

Step 2 – Fit the Exchanger

Before you fit the system you will need to consult the manual for your gas dryer, noting where the gas exhaust connects to the venting system. You will have to install your exchanger before the gas exhausts enter the vents. Remove the gas vent, and place the exchanger in position. Screw this into position, and add a tube to the other side of the exchanger. Position the tube so that the gas will pass into the vent without coming into contact with the exchanger.

Step 3 – Fit the Vent

Reinstall the vent so it gets the air from the exchanger and the exhaust. Fit the vent tubing into the part of the exhaust, so you have the connection exchanger>tube>exhaust>tubing. You will have to ensure that your vent does not travel parallel with the heat passing out of the exchanger, as this can super-heat the gases traveling through the vent. Once you are satisfied that your system is securely fitted, screw the outside vent to the side of the dryer, and tape any gaps in the joints along the venting pipe.

Step 4 – Finishing

Before you finish the project you will have to check that your heat exchanger works. Restore power to the dryer and run a drying cycle. Make note of whether heat travels correctly through the exchanger. You may want to place a carbon monoxide alarm over your vent in order to ensure that no gases are escaping into the air around the exchanger.