There seems to be something going on with your water heater…it sounds like a tea kettle. Don’t worry it isn’t going to implode. However, that noise is still a cause for some concern. Hearing whistling, also known as kettling, from your water heater is due to a problem in this vital home system.
A whistling water heater is usually due to a specific issue in your system–the build-up of sediment inside it creating problems with the heating process. While a little dirt doesn’t seem like it can hurt things, that sedimentary layer can cause noises, hinder heating, and lead to an early replacement. This noise shouldn’t be ignored.