Model # XG40T12DU36U0

Internet #204318413

Store SKU #1000035018

Store SO SKU #1001020840

Rheem Performance Platinum 40 Gal. Tall 12 Year 36,000 BTU ENERGY STAR Ultra Low NOx Natural Gas Water Heater


Performance Platinum 40 Gal. Tall 12 Year 36,000 BTU ENERGY STAR Ultra Low NOx Natural Gas Water Heater

  • Provides ample hot water for households with 2-4 people
  • Make sure it fits: measure your space to ensure dimensions fit
  • Same-day installation in most areas. Call 1-855-400-2552 by noon.
$75900 /each

Frequently Bought Together

Product Overview

The Rheem Performance Platinum 40 Gal. Natural Gas Tall Water Heater comes with a 36,000 BTU/hour environmentally friendly ultra Low-NOx radiant burner that provides ample hot water for households with 2 to 4 people. The electronic ignition system eliminates the standing pilot light, saves energy and monitors system performance. Its maintenance free combustion air intake system means there are no filters to clean and replace. A premium grade anode rod provides long-lasting tank protection. Factory installed temperature and pressure relief valve and 3/4 in. water connections are included with the water heater for easy installation. The water heater is ENERGY STAR qualified. This Rheem Performance Platinum model is Wi-Fi compatible allowing for remote monitoring of the water heater's operation (Wi-Fi Module REWRA631GWH sold separately).

California residents: see   Proposition 65 information

  • California residents: this water heater meets or exceeds ultra-low NOX (ULN) emissions requirements for all air quality management districts
  • 40 Gal. tank provides ample hot water for households with 2 to 4 people
  • Natural gas water heater costs less to operate than electric models
  • Delivers 71 Gal. of hot water in the first hour
  • 12-year limited warranty on tank and parts for your convenience
  • 3-year in home labor warranty for peace of mind
  • 0.68 energy factor indicates an energy star qualified water heater
  • Maintenance free - no filter to clean or replace
  • Electronic ignition system simplifies the startup process and eliminates the need for a pilot light
  • Electronic diagnostic gas valve monitors system performance
  • Ultra low-NOx burner reduces emissions and meets California air quality management district requirements
  • Rated for installations up to 10,200 ft.
  • Designed for easy replacement of your existing water heater
  • Call 1-855-400-2552 before noon for same-day service in most areas, or Visit our Water Heater Installation page for more information.
  • Meets 2015 NAECA Standards

  • Click here for more information on Electronic Recycling Programs

Info & Guides

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Name Performance Platinum 40 Gal. Tall 12 Year 40,000 BTU High Efficiency Natural Gas Water Heater Performance Platinum Natural Gas 38 Gal. Damper Tank Water Heater - High Eff, Mobile Alert Compatible & 12 Yr Wnty Performance Plus 40 Gal. Tall 9-Year 38,000 BTU ULN Natural Gas Water Heater Performance Platinum 40 Gal. Tall 12 Year 36,000 BTU ENERGY STAR Ultra Low NOx Natural Gas Water Heater
Brand Rheem Rheem Rheem Rheem
Ratings (595) (464) (4) (231)
Eco Options Yes Yes
Part Warranty 12 Year 12 Year 9 Year 12 Year
Water Heater Features LoNox,Overheat Protection,Pilot Light Window,Pilot Reset Button,Self Cleaning,Temperature Pressure Relief Valve LoNox,Overheat Protection,Self Cleaning,Temperature Pressure Relief Valve,WiFi Overheat Protection,Pilot Light Window,Pilot Reset Button,Temperature Pressure Relief Valve,Ultra LoNox Overheat Protection,Self Cleaning,Temperature Pressure Relief Valve,Ultra LoNox,WiFi
Product Height (in.) 60.25 57.75 58 60
Gas Type Natural Gas Natural Gas Natural Gas Natural Gas
Tank Capacity (gallons) 40 38 40 40
Water Heater Profile Tall Tall Tall Tall
View Product View Product View Product View Product




Warranty / Certifications

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Customer Questions & Answers

How long is the electrical cord?

It requires an electrical outlet. I will have to have an outlet installed. So, how long is the electrical cord?
Asked by: Rodney
Just got mine. It's a generous 19 feet!
Answered by: VSGlobal
Date published: 2016-06-02

If this is a natural gas water heater, why does it need to be plugged in? Does it spend as much electricity as electric

Asked by: kk
Electricity powers small motor to open and close vent damper, which makes this heater operate more efficiently.
Answered by: Buckley
Date published: 2017-01-25

Does it include the "Home Comfort WiFi Module for Select Rheem Performance Platinum Gas Water Hea...

Does it include the "Home Comfort WiFi Module for Select Rheem Performance Platinum Gas Water Heaters"
Asked by: Vin
Unfortunately no the WiFi Module is a separate purchase.
Answered by: Rheem
Date published: 2017-03-06

Is it true this unit can not be installed near a washer or dryer?

I was told this unit could not be installed within 10 feet of a washer or dryer.
Asked by: Curiousity
I installed mine at the location of my old water heater which is within a few feet of were the washer and dryer are located. If your old water heater is located in an area closer to your washer and dryer I find nothing the manual that states not to install it within 10 feet of your washer and dryer.
Answered by: debruynd
Date published: 2016-08-28
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Customer Reviews

Performance Platinum 40 Gal. Tall 12 Year 36,000 BTU ENERGY STAR Ultra Low NOx Natural Gas Water Heater is rated 4.1 out of 5 by 231.
Rated 4 out of 5 by from Have only been using a couple of weeks. Seems to be performing as expected. Hard to find water h... Have only been using a couple of weeks. Seems to be performing as expected. Hard to find water heater that meets CA enviormental standards, which this one does.
Date published: 2017-02-27
Rated 4 out of 5 by from Energy Star Performer Initially the unit would not start up due to a faulty flammable-vapor detector. Rheem's local contract plumber came out and replaced the bad component within a day and a half, and the unit has performed flawlessly ever since (in service now 15 months). It has no noticeable impact on our electric bill, and on standby at 120-125 degrees appears to use less than 0.1 therms of gas/day. It is very quiet when heating. The installation involved adding an electrical outlet and modifying the plumbing (it is shorter and wider than the previous unit), which was most of the work. Installation of the water heater itself was easy.
Date published: 2016-12-28
Rated 3 out of 5 by from Great product with one flaw Bought this a year ago and performance wise I have had no issues. Easy to install and set up. It works perfectly but there is one major set back. It must be connected to an electrical outlet at all times. Trust me when I say that if there is NO POWER then it DOES NOT WORK! If you accidently disconnect it or you have a power outage then the water heater will cease to work until power is restored. I do not like and agree with this feature. When I purchased it at Home Depot, they failed to mention this to me and I thought the power was just for some advanced feature but it is not. The electrical plug sends power to the unit and it controls the igniter to start the burner.
Date published: 2017-01-10
Rated 2 out of 5 by from Decent, but has operational issues I installed this unit in OCT'16. The wireless connection is intermittent (lot of loss of signal issues even though it is close to a wireless router). Lately, the temperature fluctuates daily - will be normal, then becomes tepid - no error indications, no root cause known. I've since learned that the unit has an overly sensitive fume sensor which suspends heating for hours (until it resets) if anything is detected. Found this out through someone else who installed the unit, where kitty litter at the far end of the garage was causing the sensor to trigger & halt their water heating.
Date published: 2017-05-11
Rated 4 out of 5 by from So far so good I am happy with this water heater, it is efficient and works quickly. Not sure if there is a correlation, but our PG&E bill decreased this month. My only complaint is that the temperature is a little difficult to manage. If I turn it down a hair, it's too cold, if I turn it back up, we're scalded. They need to add a digital thermostat. This replaces a gas hot water heater that worked flawlessly for 17 years! And we used that thing every single day for all 17 of them. We couldn't replace it with the same one so we are giving Rheem a chance.
Date published: 2017-02-05
Rated 5 out of 5 by from so far so good I bought this unit a year ago and it has functioned perfectly since then. Of course, the real test is how long it lasts and I won't know that for another 12 years. The controls are very convenient and easy to understand. Very easy to turn on and off while you are on vacation. Very easy to adjust the water temperature. It heats quickly - within 20 minutes of turning on it seems to be fully heated - or at least enough so we can take two showers without running out of hot water.
Date published: 2017-01-01
Rated 5 out of 5 by from Good value after pge rebate This is an advanced water heat with a motorized flap on top to keep heat from escaping when flame is switched off. Enough hot water for two showers in a row. The one thing I strongly recommend is to change out the plastic faucet for a brass type with ball valve, plus a brass extension pipe. This is because the rubber washer that shutter water flow can be damaged by heat in as short as a few years. The entire tank of hot water has to be drained to replace that gasket.
Date published: 2016-12-16
Rated 4 out of 5 by from Great buy on a slow mover discounted product Installation was very straightforward. Powered damper and non pilot ignition system require 110 plug in within 18 feet. Purchased a floor demo for almost half off, but did not realize the ignitor wire had been pulled out. Once installed, would not fire up and showed LED error code of ignition problem. Called Rheem and explained problem. They overnighted a new ignition assembly and installation took about 25 minutes. Heater fired up and providing ample hot water. An energy saver as no pilot and dampered exhaust to retain heat around core of tank when burner is not active. Very quiet too. Rheem has stood behind their product admirably.
Date published: 2016-03-15
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