Your New Tankless Water Heater: Key Venting Requirements
- Make sure that you are using the correct piping material. Most require Category-3 piping.
- Keep the venting run as short as you can. It is more efficient, and will lengthen the life of your system. Check the manufacturers instructions and do not exceed the maximum length.
- Do not tie your tankless water heater venting into any other venting. This is very important. In most cases, you can’t tie your venting into any other venting, such as a stovepipe or a chimney. If you do, you must use the category-3 piping within the chimney, stovepipe or other venting.
- Horizontal venting should slope away from the tank, so that condensation does not run into the unit and damage the heat exchange. If you cannot do that, or if your venting is vertical, you must install a condensate drain within three inches of the vent connection.
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