Mornin' Speedball, No, it is electric...40 gal. The other water heater we had, never made this sound and we had it for 5 years....and the one before that we had for a very, very long time, and no as far as "I" know we haven't flushed any of them on purpose.

just emptied if it had to be removed and replaced. and like I said...not very often at all.
No strange noises leading up to this point....none. This just started out of the blue...
Thanks for the reply
sherri