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Identifying a Loose Exhaust Pipe

Over time, the exhaust pipe in your tankless water heater can come loose, and that will allow exhaust gases to escape into your home. This problem calls for an expert to come inspect and tighten the pipe.

How Does a Water Heater Exhaust Pipe Come Loose?

Hangers (also called supports) are parts in your water heater that make sure the exhaust pipe can't be pulled, bumped, or shaken out of place. If they aren't holding the pipe completely still, the transition clamp will lose its grip over time.

How to check for a loose exhaust pipe

  • On top of the tankless water heater, there's either one single PVC pipe or two.

    If there's only one, it's both the intake and the exhaust.

    If there's two, the exhaust should be labelled, as it could be either on the left or right depending on the unit.

  • Gently try to move the exhaust pipe. If it feels loose, then the clamp that attaches the PVC vent pipe to the blower on top of the hot water heater could be loose or not properly attached.


    CAUTION: Always be careful when working around pipes coming in or out of your water heater. They can be hot, and should be handled with care.

What to Do if Your Tankless Water Heater Exhaust Pipe Is Loose?

A loose exhaust pipe is likely the result of faulty hangers or a transition clamp, and you should call in an expert to inspect your system and identify the root cause.

NOTE: This content is for informational purposes only, and HomeX and its affiliates disclaim all liability related to it. If you decide to perform any tasks based on this information, you assume all risks, including the risk of loss or damage to property or personal injury.

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