The first five or six months in our new home, whenever we took a shower
or washed dishes or whatever, the water heater (gas) would click on for
about ten minutes or so, in three minute intervals. More and more
lately, over the last few months, its been clicking on for maybe ten
minutes but in more and more erratic intervals, like sometimes a short
20 second interval, and then like a 2 minute one, and then 6 - 15 second
intervals in a row. Really weird. We've tried messing around with the
temperature a bit but it doesn't seem to affect it. Any ideas?