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ST
RHEEM

13-7/8" x 9-7/8" x 25-5/8 Gas Tankless Water Heater, 11,000 to 180,000 BtuH, Natural Gas

  • Item # 21R452
  • My Part #
  • Mfr. Model # RTG-84DVLN
  • Catalog Page # 2768
  • UNSPSC # 40101825
Water Heater,Tankless,Nat,11K-180K BTU close
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Web Price $1,047.00 / each
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  • Shipping Weight 61.55 lbs.
Country of Origin Japan Country of Origin is subject to change.
Note: Product availability is real-time updated and adjusted continuously. The product will be reserved for you when you complete your order. More

Product Details

Unit has a 0.26 minimum gpm flow rate and 0.40 gpm minimum activation flow rate. Heater can be converted to a commercial unit (with temps. from 140° to 180°F) using conversion kits, sold separately.

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Technical Specs

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Compliance and Restrictions

  • This product has been certified by a third party to be compliant with the “Safe Drinking Water Act” requirements for low lead in potable (human consumption - drinking and cooking) and non-potable water applications (non-human consumption).

  • This item is restricted for international sale.

  • - This item has been designated by the manufacturer as an environmentally preferable product (EPP) because this item is ENERGY STAR.

Customer Reviews


13-7/8 In x 9-7/8 In x 25-5/8 Gas Tankless Water Heater, 11,000 to 180,000 BtuH, Natural Gas is rated 4.4 out of 5 by 5.
Rated 3 out of 5 by from Good features I bought this two months ago and I'm having nothing but problems.
Date published: 2017-01-12
Rated 4 out of 5 by from Tankless!! It takes a while for the water to get hot but once it is hot you do not run out of the awesome hot water.
Date published: 2016-12-04
Rated 5 out of 5 by from Easy installation and great tech support I've just had this a few days, but we already love it. I installed it myself in place of a tank-type gas heater. I purchased the valve package and vent which made for a relatively easy job. It wouldn't start up after completion, but after consulting tech support (great guys!) I discovered that the house had been plumbed with the hot and cold water pipes switched in position. With a quick change to the pex pipes it immediately kicked off and away we went. Wait time for hot water is about the same as the old tank type. I can imagine how impressive the savings will be because 99+% of the time, the unit is off.
Date published: 2016-11-22
Rated 5 out of 5 by from Still running perfectly after 2 years.. I self-installed this unit 2 years ago to replace a 40 gallon electric tank heater, and I couldn't be happier! My natural gas cost is significantly less than what I previously paid to heat the same amount of water, and I never worry about running out of hot water. I installed 3 Remote Controls for added convenience. The unit runs quietly and smoothly, firing every time I need it with no problems whatsoever. My city water supply is soft and clean, so it wasn't surprising that my recent vinegar flushing revealed no evidence of lime or scale deposits.My decision to self-install was based on minimizing initial cost, thus hoping long-term cost payback through operational savings might be realized. Based on the high cost of professional installation in my area, payback through savings would likely never be possible, as their labor rates seemed to over-double while quoting on tankless. My cost of installation was still quite expensive after buying the necessary vent piping, tubing, fittings, etc., but now that it's done, replacing the unit at its end-of-life will be easy and even more cost effective.For anyone considering self-installing one of these, I strongly recommend reading the manual multiple times and knowing the relevant local codes in your area. Plan ahead, don't rush, and sweat all the details, especially those concerning gas supply, water supply, and venting. Only use recommended venting materials! If you need to, sub out those portions of the work you may lack competency or tooling to do. It's much wiser to pay an experienced professional an hour or two labor to make your gas line connections, than to end up with a deadly gas leak. I consulted with a local licensed plumber and city inspector to make sure my installation met all requirements and was safe. Last, do a neat and clean job. If you follow all necessary requirements, you should end up with a system that operates perfectly. I highly recommend this unit.
Date published: 2016-10-27
Rated 5 out of 5 by from Tankless Water Heater Purchased just a couple of weeks ago. Performance has been flawless and installation was easy according to the plumber. Water temperature / function panel was extended to a location very easy to see and monitor each day.
Date published: 2016-10-10
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