Get ready to Rumble! - Instant hot water?

Corey Posted By Corey, Mar 17, 2013 at 11:17 AM

  1. Corey

    Minister of Fire 2.

    Nov 19, 2005
    Thought I would roll over to my 2,000th post with a question- or at least an observation...

    So after a few years of looking at the box on the storage shelf, 'Install In-sink-erator Instant Hot Water Tank at Kitchen Sink" finally rolled to the top of the honey-do list. Luckily, I was planning ahead when I re-did the kitchen, so all the electrical and other fittings were in place and it was basically a plug-n-play affair.

    Now kicking myself because it's sooo convenient! The downside is about every 15-20 minutes, the thing lights off with that 'almost but not quite boiling' RUMBLE!! It's loud enough to hear through the whole house, has woken me up from sleep a time or two, and you actually have to raise your voice a bit if you're in the kitchen when it erupts. I know this is the water in the local area of the heating coils just starting to boil. They recommend a temp of 190ºF, I'm just a bit less, but still not that hard to get localized boiling. I tried a bit lower temp, but by the time the water is out the tap and into the mug, and warms the mug, the water isn't hot any more.

    But the big questions are - do people just 'put up' with this rumbling? is this possibly a defective unit? anybody successfully 'silenced' a rumbling heater?

    I know our water heater/cooler at work doesn't rumble like this, though it's the style where you invert a 5 gallon carboy on top. So it's possible to make hot water without the rumble. I suspect the key is to have either a low power heating unit, or some way to reduce the power input as the water gets hotter.
  2. heat seeker

    heat seeker
    Minister of Fire 2.

    Feb 25, 2011
    Northern CT
    We had one a while back, and as I recall, you could hear it when the heater was on, but it wasn't very loud. Ours did have some Styrofoam insulation around it, so that quieted it some.

    Dumb question, but I gotta ask - are you feeding it the right voltage? (Not 220 on a 110 volt item?)

    These things are convenient, but have a limited life span. I wouldn't mind having one again, but am not motivated enough to install one.
  3. semipro

    Minister of Fire 2.

    Jan 12, 2009
    SW Virginia
    I notice that our electric water heaters make a lot more noise when the elements are caked with lime from the hard water. Not sure if that's what's going on with yours sink-mounted unit.

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