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  1. #21
    Justin D's Avatar
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    Quote Originally Posted by RennTECH CLS View Post
    I have done it one three homes and honestly it depends why you want them. I have mixed feelings about mine.

    On a vacation home they are great. Since your not heating the water when your not there but have instant hot when you arrive. I use to just flip the take heaters off but its nice to not have to screw with that.

    Unlimited hot water is nice if you have a big jacuzzi or large family and hot water runs out. Or when you just want to use more then you have! Keep in mind the bigger the house if you want ultimate hot water in more then a few spots you need a even bigger unit or more then one.

    Bad side is installation and unit cost. Normal 40-50gal around here is 800-1000 installed. You will pay that just for the unit dependent on you need and could pay a lot more. If you retrofitting you will need to redo the vent, could have to use a bigger gas line ect... They are more up front and can be a lot more to retrofit.

    Other bad side as great as they are in vacation homes in my primary home the savings is very little to none. Instead of using a smaller BTU burner to heat the water now you have a huge BTU flash heater. So when you take that long shower or fill up that huge tub the meeter is on over drive the entire time the water is on. I saw very little change in my natural gas bill and not near enough to offset the upfront cost of the unit and install in the time I will own the house.

    I had two 50gal conventional tanks originally so the space savings would be nice but honestly its in a basement I don't use so the added space isn't noticed for me.

    Typical installation for us is approximately $3k after parts and labor. That is a fraction of the cost of a conventional boiler and an indirect. Which was the most common choice around here a couple years ago. Also it's important to note that these tankless extract 98% of the BTU's in gas.

  2. #22
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    Quote Originally Posted by Waldoonay View Post
    Hey guys,

    I was just curious how many people made the switch to tankless water heaters, and how satisfied they were with them. Any noticeable savings on utilities?

    There's currently a $300 credit on them by the gas company here so I thought it might be a good idea to try it out in my home first (not big, 1800sqft). And after that installing one in a 4 unit multifamily.

    Thanks!
    I made that switch about 5 years ago, and its the best thing ever. I can have 2 of my showers on at the same time and the wife can do dishes without water acting up...the savings are great as well

  3. #23
    Done_ is offline Senior Member
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    Thanks for all the input guys, gives me something to think about.

    Quote Originally Posted by J08M3 View Post
    It depends on what kind of water heater you have now in your house. The idea behind solar heating water is you send an anti-freeze mixture up to your roof where it is heated by the sun. In NY we can hit 90 degrees in January and 160 in summer months. The anti-freeze then comes back to your heater and through a heat exchanger it heats your domestic water. In the case of only reaching 90 degrees in winter the water then goes to your tankless hot water heater where it only needs to be raised another 30 degrees to be hot. This is much more efficient than heating city water that comes into the house at 55 and needs to be raised almost 70 degrees.
    Thanks for the input. There's a Government rebate here for almost 50% of the cost of a solar system + install so that seems worthwhile also. I'll call around and see what kind of prices I can get around here.

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  5. #24
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    Anyone have experience with an electric tankless? I have a property that doesn't have gas service and I am looking to go tankless if it will be cheaper to run than a traditional electric waterheater.

  6. #25
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    We have friends with them. They weren't so much concerned with the savings of them as they were the instant on hot water. Their master suite is in the opposite side of the house and took 2 to 3 minutes to draw hot water to the master. Installed a tankless heater for the master and are thrilled.

  7. #26
    RennTECH CLS is offline Senior Member
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    Quote Originally Posted by J08M3 View Post
    Typical installation for us is approximately $3k after parts and labor. That is a fraction of the cost of a conventional boiler and an indirect. Which was the most common choice around here a couple years ago. Also it's important to note that these tankless extract 98% of the BTU's in gas.
    I was comparing a residential 40-50gal gas water heater swap out. you use boilers there? (normally large BTU boilers here are only in schools, apartments etc... And require state inspection yearly). I just had the 40gal at my office replaced this week For $850 vs the tankless quote of $2900 retrofit. It would be nice there since it's limited use but I am so so about the ones at the house so I passed for the price. Love them at the lake house where unlimited hot water comes in handy.

  8. #27
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    I have it, it takes a while for hot water to heat up

  9. #28
    Justin D's Avatar
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    Typical or non-green homes around here, at least the nicer high end homes all have hydronic heat systems, meaning you heat water and run it through a coil in an air handler that blows air across it to warm up, then distributes that warm air through the house. Since you need a boiler to heat that water, we usually use that boiler to heat water in an indirect water heater. Basically a big insulated holding tank that uses a heat exchanger to heat your domestic water from your boiler. Many of the houses we build are quite bigger than the national average, so you need numerous air handlers throughout the house to handle the heating and cooling needs. You wouldn't want to have a source of fire in each one, so we send hot water to all of them throughout the house instead.

  10. #29
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    Hey there! perfect topic! My dad has been in the industry for many years, he was the vice president of Takagi and is now the president of Navien, a newer brand on the market. We've obviously got one in the house. Highly recommended that you get one.
    "Don't concentrate on the finger, or you will miss all the heavenly glory." - Bruce Lee

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  11. #30
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    I have 3 of these units in my house (the Rinnais) and at best I have mixed feelings about them. it all works as described and I have plenty of instant on hot water to included a couple of Jaccuzzi tubes... but here out in the sticks the hard well water tends to clog them up a bit and most of the local plumbers cant figure out /troubleshoot the system out to save their lives. this included the Rinnai factory recommended tech. Maybe in a city with municipal water or in a less complex setup this is a non issue but for me I sometimes kind of miss the big old water tank..
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