I replaced a water heater about a year ago with a Whirlpool.
Sometimes, but not always, I can hear faint splash and sizzle noises coming from it, like a drop of water hitting something hot every few seconds. It doesn't persist long. THe unit works very well, and there's no indication of external leakage.
You didn't say if it was gas or electric, but I'll tell you my story anyway...
I had a gas water heater that sprung a pin-hole leak right near the top of the flue tube. The leak was not a drip, but a "mist" that shot from the unit whenever it was under pressure. When the burner was on, the mist would get caught in the rising flue gases, hit the inverted funnel on the flue pipe and condense, dripping back down onto the top of the unit. I can't recall if it sizzled, in fact I don't even recall what caught my attention and made me investigate the problem. It was actually pretty interesting. If I turned the burner off, no drip. As soon as I would turn it back on, water would start dripping off the funnel.
It's gas. The sizzle seems to be coming from down low on the unit, near the flame. No sign of any water or steam or mist. I live in northern CA and it's been rainey and cool, condensation is a real possibility.
Probably normal condensation dripping through the flue pipe. My WH had a notice about that in the owners manual and I think there is also note on a label affixed to the WH. Kevin
If it's leaking down inside the flue tube, I don't think you'd be able to see it unless you pulled the flue and looked straight down into the tube with a flashlight. It could be dripping down onto the hot burner or something that the pilot light is keeping warm. Just a thought...
True...maybe that's where his sizzling is coming from - a leak inside the tube above the deflector.
A leak below the deflector might never be found, unless the unit was allowed to cool to a point where the water didn't evaporate, eventually pooling enough to appear on the floor.
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