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  1. Replies
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    Just how accurate are tempering valves? Is it...

    Just how accurate are tempering valves? Is it +/- 1 degree, +/- 5 degrees, +/- 10 degrees, or +/- 20 degrees?

    I read that they are somewhat crude and can have large +/- temp variation, but I...
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    The Navien rep told me, and this is a direct...

    The Navien rep told me, and this is a direct quote:
    "The decibel rating of our units range from 25-30. It is much quieter than our competition. You will not hear our burner or fan unless you have...
  3. I just spoke to Navien. They said not only do...

    I just spoke to Navien. They said not only do they not ding your warranty if you recirculate, but their unit comes with a recirculation pump already built in.

    The built-in buffer tank is 1/2...
  4. I'll assume natural gas, because that's my fuel...

    I'll assume natural gas, because that's my fuel source.

    Is it just my false impression or is the dividing line between tankless and boilers is starting to fuzz over? In its favor, a boiler...
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    It shouldn't change your decision, but one...

    It shouldn't change your decision, but one possible gotcha I just realized: somewhere down the line one of your units goes bad and needs to be replaced. Not a problem now, but in the future maybe...
  6. Any issues in using propylene glycol in a tankless?

    Non-potable. Closed-loop hydronic system for heating. Exterior, wall-mounted unit.

    Any issues with performance, maintenance, warranties, etc.?

    If it matters, I'm gravitating toward a Rinnai. ...
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    Nicholas, With those facts and choices, it...

    Nicholas,

    With those facts and choices, it seems like a no brainer, provided you have the space. Consider:
    1. You would need to maintain the GU32 as well.
    2. Odds are against both Rinnai's...
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    Nick, You may find this comparison chart...

    Nick,

    You may find this comparison chart helpful:

    http://www.focusonenergy.com/data/common/dmsFiles/R_RR_REFR_PreqlNatGasWH90Per0707v2.pdf

    It lists condensing water heaters from various...
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    Thanks for the correction, BimmerRacer. I...

    Thanks for the correction, BimmerRacer. I thought it was your initials.
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    Thanks for running the test, YMMV. It proves...

    Thanks for running the test, YMMV. It proves that loudness varies with demand, and therefore a single number of 49 db(a) can't be right.

    I think I'll assume 49 db(a) is the low end. If the newer...
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    One thing different about the Eternal is that...

    One thing different about the Eternal is that it's minimum BTU consumption is 47,500. That's more than 2x a Rinnai or Bosch.

    I happen to have the actual BTU figures documented in another thread:...
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    BimmerRacer, Does its loudness vary depending...

    BimmerRacer,

    Does its loudness vary depending upon demand (i.e. maximal versus minimal water heating, such as all taps open versus a single faucet)?

    David
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    For instance, Eternal gives the "maximum noise"...

    For instance, Eternal gives the "maximum noise" for it's different models, although it's ambiguous as to whether Eternal's db refers to db(a) or some other reference.

    Ideally, I'd like to see the...
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    How quiet is a Rinnai tankless, *really*?

    I'm considering the purchase of multiple Rinnai tankless hot water heaters for a remodelling project where maintaining quiet is one of the design objectives. Rinnai claims its tankless units are...
  15. I guess you mean the transition at the bottom? I...

    I guess you mean the transition at the bottom? I toook some closer photos. I could post if it might shed any light.

    What would be the motivation for using this type of connection? The house is...
  16. Ever see a lead toilet connection like this before?

    It apparently penetrats the slab, and then somehow was grafted/soldered to regular 3" PVC below. But how did they do it?

    I presume they used lead because it could deform (which, as you can see,...
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    Seriously, fostapex has an aluminum sheathing...

    Seriously, fostapex has an aluminum sheathing around the PEX core. I'm not saying a rodent is incapable of chewing through it, but would it want to? When you were a kid, did you ever try chewing on...
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    Is Fostapex more resistant to rodent attack? ...

    Is Fostapex more resistant to rodent attack? What about other sheathed forms of pex?

    David
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    I took a closer look, and it's actually a NAIL...

    I took a closer look, and it's actually a NAIL that's partially supporting the drain. The nail is supporting one side, and the wooden block the other.

    Is this common? It apparently works, but it...
  20. Thanks for the feedback and suggestions. I think...

    Thanks for the feedback and suggestions. I think I'll price out a CMU or ICF exterior structure. They look fairly easy to build.

    By the way, 60 Minutes did a show sometime in the last year or...
  21. I'm sure noise is a "who cares?" topic for most...

    I'm sure noise is a "who cares?" topic for most people. Too bad for them. Ignorance isn't always bliss. I care about getting an accurate noise measurement because I care about getting quality...
  22. Ladiesman, Your original post said 10 feet,...

    Ladiesman,

    Your original post said 10 feet, which is more like 3 meters.

    Why not just measure it at 1 meter?

    The HVAC guys measure it at greater distances because they're trying to distort...
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    For instance, maybe a viscoelastic coating like...

    For instance, maybe a viscoelastic coating like this:

    http://www.quietsolution.com/html/quietcoat.html

    could be applied to the toilet drain pipes to good effect?

    David
  24. Hi Ladiesman271, What's the decibel level when...

    Hi Ladiesman271,

    What's the decibel level when measured at 1 meter? That's the usual distance for taking noise measurements.

    David
  25. How loud are the tankless units? I don't think I...

    How loud are the tankless units? I don't think I ever found reliable decibel information.

    David
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