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Noise reduction on power vent water heater

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Jeff says:
December 30, 2010 at 9:08 am
I’m am looking to see if there are any products or ideas for noise reduction on a rheem power vent water heater the noise issue I have is on the outside is more of a high volume air flow the inside is not bad I have been looking for a silencer/muffler have found none looking for way to build a non restrictive free flo but reducing device was considering even an automotive muffler like a glass pack thinking it will reduce.
At this time I am using 2" would up sizing to 3" help though it is a short run of around 10' long. Any help you may have would be great of coarse when you approach the manufacture they don’t recommend you do anything but we all know that is the case with anything you buy I guess that is why there is aftermarket for everything.
asked in Gas Water Heater by darekrudy (21,730 points)
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1 Answer

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Hi Jeff,
Yes, there’s aftermarket for almost everything smiley… I can’t really help you with suggesting a WH muffler and I’ve never seen one installed on a WH PVC vent pipe. Over the last few years I’ve inspected many of the power vent water heaters and several noisy ones, but in most cases it was the motor, not the air.
However, to answer your question about up-sizing of the WH vent pipe to 3” diameter – Yes, it will reduce the noise because the exhaust gasses speed will drop significantly with the larger diameter of the PVC vent pipe. Install the reducer as close to the induced draft motor enclosure as possible (depending on your water heater size / BTU’s you may be able to go up to 4” in diameter but you have to check the manual).
Additionally, install 45° or 90° at the exterior termination of the water heater power vent pipe to deflect exhaust gasses and the noise towards the ground (put rodents screen at the end).
I’ve heard suggestions that additional elbows along the run will further silence the noise but I’m not sure of that. If you decide to do it, use vent connector length tables that apply to your particular appliance.
Let me know if this helped or if you have any other questions.
answered by darekrudy (21,730 points)