Technically you can vent your tankless heater through the chimney but only in certain circumstances.
Navien tankless water heater venting through roof.
It really is not a good idea.
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.
Storage tank propane water heaters vent through the roof using galvanized steel b vents because they work through natural draft allowing the hot exhaust air to rise up and out of the facility.
Traditional gas tank water heater require venting through the roof.
This will allow your water heater to operate efficiently and effectively and most significantly it will avoid any probability of danger and therefore the risk of carbon monoxide gas poisoning.
To do this two critical measurements must take one on the ceiling above the water heater and one that is the distance from the attic floor to the roof.
Installing your tankless water heater for easier venting.
Whenever we are installing a gas water heater building codes require that there should be a ventilator out of the room through the attic and out through the roof.
By contrast tankless water heaters vents can terminate on a side wall because their combustion fan blows exhaust from the units horizontally.
The biggest issue is that the condensate is very acidic and will corrode the masonry of a chimney.
By sharing the main intake and exhaust vent pipes effective system venting is available with less venting materials and minimal number of penetrations on the walls or roofing.
Tankless water heaters use fans to blow exhaust from the unit horizontally allowing vents to terminate on the side of a house.
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The navien common vent system provides an easy way to install the vent system for up to 8 navien npe water heater or nhb nfb boiler units.
Tankless water heater venting through roof is not necessary.
Traditional tank gas water heaters vent through the roof using galvanized steel b vents because they work through natural draft allowing the hot exhaust air to rise up and out of the house.
When venting navien npe tankless water heaters it is important that you do not start the vent run with a street elbow at the vent collar.
Gandy installations saves customer enough space for a refrigerator.
To make venting easiest install your tankless water heater on an outside wall.