Condensing Tankless Water Heater Venting

Vent to the outside.

Condensing tankless water heater venting.

Traditional gas tank water heater require venting through the roof. With a condensing tankless water heater you don t need metal venting. Non condensing tankless water heaters typically transfer to the water only about 80 percent of the heat they generate. All of them unpleasant and some quite dangerous.

The exhaust vent is also made of pvc or plastic and not metal which a feature that reduces the value of the installation. The standard galvanized vent from your old storage tank heater would quickly rust away if your tankless heater vented. Condensation tankless water heaters minimize the value of the installation. If a tankless water heater is not vented properly a number of things can happen.

The remaining heat creates a hot exhaust gas that requires metal venting typically stainless steel or thick aluminum. The exhaust is a gas condensate that is highly acidic and corrosive to the venting so they require the right material. Installing your tankless water heater for easier venting to make venting easiest install your tankless water heater on an outside wall. Tankless water heaters use fans to blow exhaust from the unit horizontally allowing vents to terminate on the side of a house.

If the unit is installed on a basement wall the vent pipe can be run up just a few feet and then vented out the side with the use of a 90 degree elbow. The vent pipe must be made of stainless steel designed for venting corrosive gases. Tankless water heaters that have a coaxial vent style provide further safety advantages. The tankless heater cannot share vent piping with any other appliance and it cannot use a masonry chimney flue for venting.