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Noisy/Smelly DHW combustion vent bothering neighboors
I recently had a new AO Smith Cyclone condensing hot water heater installed and I love it. It's providing plenty of hot water and I'm seeing a huge impact on the amount of gas we're using as opposed to the old heat exchanger off our steam boiler. Not running the boiler in the middle of Summer has been great.
So I'm ecstatic about it but my neighbors aren't as much. They're complaining about the noise as well as a gas smell coming from the vent. Usually there's a low rumbling sound when it's firing, but every once in a while there's also a banging noise. Is something wrong there or is that just how it is? Are there any kind of sound attenuators that are rated for condensing venting?
For the gas smell issue, I do detect a slight natural gas smell, especially at the start of the cycle, which I believe is some type of purge. Should I be worried that something is wrong with the firing? Should I have the utility come and check the gas levels at the vent? Most importantly, is there any way to reduce the smell?
Any answers or guidance is greatly appreciated! I'm getting in touch with a sales rep for the heater and will post any info I get from him.