A.O.Smith/Rinnai R98LSi-N ASME

Discussion in 'Tankless Water Heater Forum' started by Jeremy Keehn, Mar 19, 2013.

  1. Jeremy Keehn

    Jeremy Keehn New Member

    Messages:
    1
    Location:
    California
    I'm looking for a tankless gas indoor water heater for my 4 bedroom house and I came across this A.O.Smith/Rinnai R98LSi-N ASME. It seems like a really good deal, I'm wondering why, and I have a few questions:

    Why isn't the brand simply 'Rinnai'? Is this a hybrid brand and I should be concerned for some reason?
    This looks almost identical to the R98LSING, but it's a different model #. Any major differences?

    I want to buy this thing, so any non obvious advice or help would be appreciated.

    Thanks

    Last edited by a moderator: Mar 19, 2013
  2. Dana

    Dana In the trades

    Messages:
    2,793
    Location:
    01609
    It looks like an A.O. Smith branded Rinnai commercial hot water heater, not an A.O. Smith design.

    ASME rated tankless heaters are usually suitable for space heating & combi-heater as well as commercial hot water service, but usually have much lower turn-down ratios, but according to the spec it's min-fire goes down to 19,000BTU/hr which isn't terrible. (Many residential tankless units can run down to about half that though.) It's max-fire of 237,000BTU/hr is higher than the 199K residential tankless limit, but not so much so as to create a problem in a residential app.

    This is also not a condensing unit- the raw combustion efficiency on it is about 85%, which would require stainless steel Z-vent rather than PVC for the exhaust, which adds quite a bit to the installation cost. Sometimes it's cheaper to go with a condensing heater and PVC venting when the venting runs have any substantial length, avoiding the high material cost of the stainless.

Share This Page