Venting Tankless Water Heater Into Furnace Exhaust

Gas tankless water heaters don t have to use indoor air for combustion.

Venting tankless water heater into furnace exhaust.

All emission of liquid or gas water heaters which are tankless needs vent pipes made of stainless steel and approved by ul. Set the water heater thermostat to its lowest setting typically the vacation setting. Select either an adapter of three inch or an adapter of four inches depending on what water heater model you decide. Outside tankless water heaters free up indoor space.

Facts about tankless water heater venting. You furnace vent pipe is probably type b vent and not suitable for this use. Installing your tankless water heater for easier venting to make venting easiest install your tankless water heater on an outside wall. They are there for a reason and they supersede building code.

It would be a potential fire hazard. Tankless water heaters don t always need two ventilation pipes even for direct vent units. The existing vent pipe is typically too large and must be replaced with one of a smaller dimension so the water heater can heat the vent enough to ensure exhaust gases rise out of the home. Always follow the manufacturer s installation instructions exactly.

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. This will prevent the water heater from turning on and burning you with exhaust gases. Direct vent and power vent. Remove the anchoring screw from the base of the flue pipe.

Remove the flue pipe. Indoor tankless water heaters draw in outside air. Tankless water heater venting features. Tankless water heaters are vented in two ways.

A high e furnace has separate venting which leaves the existing vent pipe to serve only the water heater. Typically they require stainless steel triple wall venting. Tankless units withstand below freezing temperatures.