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Thread: Straight Talk About "On-Demand Tankless Water Heaters by A.O. Smith

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    Illinois Licensed Plumber SewerRatz's Avatar
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    Default Straight Talk About "On-Demand Tankless Water Heaters by A.O. Smith

    The following is some questions and answers about tankless water heaters. I think this will be a great help to all that are considering a tankless unit. Click on the picture to see a larger image.
    Last edited by SewerRatz; 02-10-2009 at 05:48 PM.

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    Extreme DIY Homeowner Scuba_Dave's Avatar
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    You had me saying "NO" at tankless
    DIY Handyman (not 4 hire)
    I have enough to do to my own house

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    Illinois Licensed Plumber SewerRatz's Avatar
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    Just a note to those that think A.O. Smith doesn't want to sell you a tankless water heater. That is false, what they want you to do is make an informed choice when you are considering a tankless unit. They want people to realize here in the USA we take the amount of water we use at once for granted, and if you install a single unit in a high demand situation the water will not get hot enough to be satisfactory. Which is why they point out it could be costly to replace your tanked heater with a tankless unit.

    For some homes two units are needed to provide you enough hot water for those peak usage times. Below is a pic showing how two units are installed. Just a note if you are just washing your hands only one unit fires up, the only time the second unit will turn on is when you exceed the flow rate of the first unit to get the desired temperature.


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    Illinois Licensed Plumber SewerRatz's Avatar
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    Another note about the cost of installing tankless units is gas pipe sizing. Most Tank units only use 1/2" piping due to BTU ratings which the most common is 40,000 BTU's. Tankless units on low flow mode usually draws 25,000 BTU's and full flow mode can go as high as 199,000 BTU's, some units can go higher but they must follow boiler installation codes once they go over 200,000 BTU's. Well in most cases you will need to tap off the main gas supply coming into the home with a 3/4" line to the tankless unit, if you have to install multiple units as this next picture you will see they ran 1 1/4" pipe up to the units then reduced it down to the 3/4" to the units, This insures that when all three units fire up at their 199,000 BTU's they will get enough gas to run at that setting. So this is the other part of the expense that A.O. Smith is talking about.


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    DIY Member dimprov's Avatar
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    How loud are the tankless units? I don't think I ever found reliable decibel information.

    David

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    Illinois Licensed Plumber SewerRatz's Avatar
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    Quote Originally Posted by dimprov View Post
    How loud are the tankless units? I don't think I ever found reliable decibel information.

    David
    They are no louder than a power vent water heater. I never went and measured the decibels. I will try to research this a bit and post it here when I get the answers.

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    Master Plumber Redwood's Avatar
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    Quote Originally Posted by dimprov View Post
    How loud are the tankless units? I don't think I ever found reliable decibel information.

    David
    They are a little quieter than one of these...



    Seriously the powervent is a good comparison..

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    Master Plumber Redwood's Avatar
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    Here is an interesting read that was a test involving Bradford Whit EverHot tankless units vs. tank type...
    It was published in P&M
    http://www.bradfordwhite.com/images/...VsTankType.pdf

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    Illinois Licensed Plumber SewerRatz's Avatar
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    Quote Originally Posted by Redwood View Post
    Here is an interesting read that was a test involving Bradford Whit EverHot tankless units vs. tank type...
    It was published in P&M
    http://www.bradfordwhite.com/images/...VsTankType.pdf
    Ah yes, my local plumbing supply hands that out to homeowners that come in asking about tankless heaters. I am going to make jpgs of them 4 pages and post them here in this thread too. I like to see this thread stay on the facts of tankless heaters instead of a battle ground like the other threads ended up becoming. Thank you Redwood for posting this PDF

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    Illinois Licensed Plumber SewerRatz's Avatar
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    Thanks Redwood for the pdf to Bradford Whites testing of Tank Vs Tankless water heaters. Also if you want to view these larger click on the page you want to view. These images where made from the pdf file Redwood posted http://www.bradfordwhite.com/images/...VsTankType.pdf








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    Extreme DIY Homeowner Scuba_Dave's Avatar
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    I dunno to possibly save that .15 a week I might be tempted
    I was hoping to see long term test to allow for scale buildup
    DIY Handyman (not 4 hire)
    I have enough to do to my own house

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    Quote Originally Posted by Scuba_Dave View Post
    I dunno to possibly save that .15 a week I might be tempted
    I was hoping to see long term test to allow for scale buildup

    I'll let you know this August (1st year anniversary) when I do my first descale how hard it was and how bad the system was hosed up....
    "Dude, we can fix that. My old man is a TV repairman, he's got the ultimate set of tools!" --Jeff Spicoli


    http://web.me.com/greg.saulsbury/ChosatongaSpeaks

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