Of all the components in your water heater, one of the most important is the ventilation. All natural gas and propane water heaters require a venting system to properly disperse the moisture, carbon monoxide, and other gases produced when the unit burns the gas.


There are multiple types of ventilation models, but they all work to remove the byproducts of heated natural gas and propane heaters. Vents are usually located at the top of the unit. You may see PVC or galvanized steel leading out from the top of the tank.

Identifying Ventilation Issues

If you think you may have ventilation issues with your water heater, a P&D Mechanical certified technician can inspect your heater to identify the problem and make the necessary repairs.


Venting issues usually arise from poor installation or cheap patching repairs. Sometimes, installers try to save money by reusing existing venting systems on old water heaters and installing them on new water heaters. However, doing so can void the manufacturer’s warranty and cause more problems in the long run.

Symptoms of Poor Ventilation

The most common symptoms of the improper venting associated with the negative air pressure are:


●        High concentration of CO2 and CO

●        Pilot light outage

●        Water heater soot

●        Poor water heater performance

●        Slow recovery of the gas water heater

●        Flame rollout


The Effects of Poor Water Heater Ventilation

Improper venting can cause your water heater to backfire or overheat. In the event that a water heater overheats, the unit’s TRD (Thermal Release Device) will be triggered. The purpose of the TRD is to ensure the temperature inside the combustion chamber does not exceed the safe limit.


If the TRD on your water heater is triggered, the glass device will overheat and break, which will cause the gas valve to shut down and prevent your unit from firing.


Rather than discharging the byproduct gases, a water heater is likely retaining them if the venting is not properly installed or repaired. This situation is so dangerous that the unit must be shut down to prevent carbon monoxide poisoning.

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If you are experiencing problems with your water heater, contact P&D Mechanical. We provide complete water heater installation, repair, and replacement for homeowners in Robbinsdale and the surrounding Twin Cities area. We can restore your water heater and have it running like new once again.


To schedule service, call us at 763-533-2218, or you can message us on our contact page.

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