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Rinnai Continuous Flow Water Heater- Any Experience With It?

Can anybody let me know the experience with these heaters. I have a ductless heating system and have to run my furnace either with a combo unit like this or with a separate boiler and water heater. The boiler/water heater combo is about $3000 more expensive. I had heard that this continuous flow water heaters had problems although they have been used in Europe for years. Any comments from those familiar with my setup.
Right now, I have a Lennox complete heat system- the biggest piece of engineering garbage I’ve ever seen- and a source of endless grief!

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  1. Comment by johntind
    November 17, 2009 @ 10:45 am

    I have installed 10-15 Rinnai tankless heaters and two of them outside. I recommend putting the small electrical circuit on a backup battery or generator so that if you lose power during cold months the small amount of pipes won’t freeze outside.
    They work very well, and ive never had a problem with any of the ones Ive installed.

  2. Comment by Anonymous
    November 17, 2009 @ 3:51 pm

    First off Patrick is an idiot because if he has 42 degree water he lives in north Alaska and he is not a certified installer People like these top contributers should shut their cake eating holes. You can’t get domestic hot water and heating water out of the Rinnai at the same time. Nobody can answer your question because you did not give the correct info. Do you have a boiler with base board? Or a Furnace that blows hot air?

  3. Comment by pilot
    November 17, 2009 @ 8:38 pm

    Get the Rinnai – I have never seen such an efficient system. Heats fast for as long as you need it. The ones I used in England were not vented but in this country each little jurisdiction (kingdom) has it’s own code so I suggest you check with your local authority. Rinnai may actually have the code for your location.

  4. Comment by patrsup
    November 17, 2009 @ 11:04 pm

    The only thing I will mention is that most will only raise the water about 50 degrees in one pass. As my incoming water from my well is 42 – using this I can at best with a clean heat exchanger get 92 degree water which is unacceptable for the dishwasher or shower. Make sure you scope this out – its in the specs but normally is fine print.
    We citizens don’t need to know every detail of every military operation in this new kind of war. Nor should the media tell us and hence our enemy. – COL David Hackworth

  5. Comment by Tasneem
    October 2, 2014 @ 5:51 am

    As a plumber Ive done a lot of frezee break repairs, the hot lines always frezee first. If youre worried that the hot line could be partially frozen then you could simply let the hot and cold drip on your faucets to prevent possible freezing.Im kind of unclear as to what you mean by the hot water starts spraying real heavy, do you mean when you turn the hot water on it is normal for a second, then it starts spraying? And does it not do the same thing on the cold side? And also, does it start spraying at every fixture the same way? Was this answer helpful?

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