Ans: There is no noise pollution related to the product as the gas heater does not produce any kind of noise. However, if you are able to hear anything, is the indicator something is wrong with your heater. There is a possibility you might hear a clicking noise, which is actually situated with the build-up of various kinds of waterborne sediment at the bottom of the water heater. This might even lead to overheating as the sediments stop the water heating process making the heater body extremely warm. You can, however, correct it, by simply draining the water out the heater to get rid of the sediments.