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Thread: Tankless water heater

  1. #1
    Join Date
    Oct 2006
    Location
    Central NY State
    Posts
    3,362

    Tankless water heater

    Thinking about replacing our older unit with one like this:

    http://www.amazon.com/BOSCH-HEATERS-...8212693&sr=1-3

    [bosch tankless or similar LP unit]

    We have hard water, but it has a 10 yr warranty.

    Anybody with experience with this type?
    Does it make noise?
    Our current unit is a gas fired water tank, but has a power vent with a fan that makes alot of noise as it turns on and off at night.

    TIA
    Ken

  2. #2
    Join Date
    Nov 2006
    Location
    Indiana
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    224
    With the price of gas rising all the time, I'd run 220 wiring and go electric instead of gas.

  3. #3
    Join Date
    Oct 2006
    Location
    Tokyo Japan
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    15,582
    Doug, I'm going to disagree with you on this one, the elecrtic units that are big enough to do the job right, use a LOT of electricity, gas ones are cheaper to run, even here in Tokyo.

    Just my experience.

    Cheers!
    The pessimist complains about the wind; the optimist expects it to change; the realist adjusts the sails.
    William Arthur Ward

  4. #4
    Join Date
    Nov 2006
    Location
    Mountain Home, Arkansas
    Posts
    11,697
    Mixed responses from those folks I know who use them. Some love 'em, some hate 'em. My son built a lake house and has them, takes 10-15 minutes before warm water begins coming through. He hasn't investigated why so it could be a plumbing situation not heater fault. But rapidity of response is something to ask about.
    "Folks is funny critters."

    Think for yourselves and let others enjoy the privilege to do so, too. ~Voltaire

  5. #5
    Join Date
    Dec 2006
    Location
    southwestern Pennsylvania
    Posts
    17

    Rate of flow

    Ken
    I wanted to convert to a tankless water heater back in 1995.
    Had the foresight to take a 5 gal bucket up to the shower and time the flow of the "BIG" "falls like rain" shower head. Guess what - the tankless would not keep up with the flow - ah! shucks.
    Hence no tankless here.
    So I said to myself - how about two in series or parallel? BUT at $1100 a piece - am I crazy?
    Alas, no new technology.
    Daniel

  6. #6
    Join Date
    Oct 2006
    Location
    Placitas, NM in the foothills of the Sandia Mt
    Posts
    688
    Hey Ken,
    Only negative thing I have heard (and it sounds like you are already on this) is that the heating elements create very small "pipes" for the water to run thru and hard water will quickly clog the pipes. But I guess with a 10 year warranty, this might be moot.
    Don't believe everything you think!

  7. #7
    Join Date
    Oct 2006
    Location
    Tokyo Japan
    Posts
    15,582
    Our gas ones provide hot water in about 10 seconds, and it will run the shower at full tilt, the dishwasher, the washing machine and the kitchen sink, I know, we tried it

    At the touch of a button ours can also change temps, from a low of about 30C (86F) to a scalding high of 60C (140F).

    I guess we fall into the "Love em" category.
    The pessimist complains about the wind; the optimist expects it to change; the realist adjusts the sails.
    William Arthur Ward

  8. #8
    Well, like the ads say, size counts.
    If it takes more than the time to run the water through the pipe to get hot water, your heater is too small.

    I have an electric 36 KW unit that can keep up with everything except filling the bath tub in the middle of winter with the hot valve wide open. The solution is to run the water at a slower rate. The water temp out of the heater is 125 degrees. The unit only serves our two baths in the bedroom area. I think that I would go with a 26 or 30 KW unit if I were to do it again. Our house is totally electric, and we are paying 12 cents per KWH.

    For the kitchen and laundry, we have a 50 gal Rudd Marathon electric heater. IF you are replacing an electric hot water heater, it is the way to go. R17 insulation all around and a lifetime fiberglass tank. This heater also gets supplemental heating from our geo-thermal system.

  9. #9
    Join Date
    Oct 2006
    Location
    Central NY State
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    3,362
    Thanks for your many replies. We have LP fairly reasonably available, and 'lectric is $.16 per KH, so I'm definitely going with gas, BUT - do these things make noise when they run?

    I've seen at least one with some kind of venting fan - which is what we have now on our gas-fired tank, and it is loud.

    Ken

  10. #10
    Join Date
    Nov 2006
    Location
    Wisconsin Dells, WI
    Posts
    484
    Ken, I've got a Rinnai unit that we installed in our house when we built it last year. It's a natural gas unit and I'm sold on them. It powers our laundry, 2 baths with showers and a large Jacuzzi type tub. We have used both showers at the same time and never run out of hot water. Nor do we run out of hot water filling the Jacuzzi tub. We have hot water in the time it takes the hot water to get from the unit to the faucet. As the unit is pretty close to both baths, I don't think we're seeing much more than a gallon of water go down the drain before the water is hot.

    As for noise, you can barely hear ours run if your standing right next to it. Noise was my concern also, as ours has a output of 185,000 BTU. It's much quieter than a regular gas water heater with a tank.

    I will be getting another one for the kitchen when the 40 gallon tank unit we have for that area needs to be replaced.

    I like ours and I do believe we are saving money by having it.

    Karl

    Ken, I just read about the unit you mentioned. It is not big enough to replace a tank type HWH. You would need something with a flow of at least 6 GPM. Also, you should check the incoming water for temperature. I'm on a well and my water comes into the house at between 50 and 52 degrees. From what I'm told most city water comes in closer to 60 degress. That will make a difference. I have my tankless unit set for 120 degrees. That is plenty hot for showers and normal washing of hands etc. The dishwasher and washing machine have heating elements that heat the water they use, so a hotter setting on the tankless unit is not necessary.

    Karl
    Last edited by Karl Laustrup; 08-28-2007 at 10:39 AM. Reason: Add information

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