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.
$759.00 /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 40 Gal. Short 12 Year 40,000 BTU ENERGY STAR Natural Gas Water Heater Performance Platinum 38 Gal. Tall 12 Year 40,000 BTU ENERGY STAR 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 (567) (331) (372) (218)
Tank Capacity (gallons) 40 40 38 40
Water Heater Profile Tall Short Tall Tall
Part Warranty 12 Year 12 Year 12 Year 12 Year
Gas Type Natural Gas Natural Gas Natural Gas Natural Gas
Product Height (in.) 60.25 50.5 57.75 60
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 LoNox,Overheat Protection,Self Cleaning,Temperature Pressure Relief Valve,WiFi Overheat Protection,Self Cleaning,Temperature Pressure Relief Valve,Ultra LoNox,WiFi
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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: 2016-11-08

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 210.
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
Rated 1 out of 5 by from Defective control valve and fv sensor Fume and vapor sensor and control valve had to be replaced after only 3 months of operation. Had to have installer back 3 times to do the repairs.
Date published: 2016-10-28
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 1 out of 5 by from I Just Got Rheemed. Beware of Flammable Vapor Sensor Lockout I wish I can come back and favorably update this review at some point. I ordered this unit online and picked it up at the local HD. Ordering and pickup was awesome. I chatted online to get the right water heater for my area and decided on this. When you are out of hot water you move decisively. I probably should have read the reviews more closely because there appears to be a problem with the sensors on this unit which shut it down and is impossible to reignite. That is what happened to me. I purchased and installed the unit last night, got it filled and hot water was on its way. 12 hours later hot water is gone and I am stuck with a code saying the unit is "Lockout and that gasoline or other flammable vapor(s) were detected." There was nothing of the sort. No cleaning agents. Nada. Tried for hours to reignite using the instructions which is done by turning it of and on. I have had this unit 24 hours and it has cut out on me. I'm worried about intermittent shut offs during the ownership of this unit. I would like to return this if I can't get it started in the morning. Not happy. No hot water. Home Depot you should maybe not sell this unit. Rheem please tell me you have a solution for this. I do not want to have to disconnect and roll this thing into Home Depot or pay any more to get this to work. Not to mention the wasted 40 gallons of precious water that is scarce and expensive here in Southern California. The "LED Guide" is precious. Basically you can sum up each code solutions as "Replace part using qualified service technician." I just got Rheemed.
Date published: 2016-04-01
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 1 out of 5 by from Not high quality I bought this unit 4 months ago and the unit has failed twice in the past 3 weeks. I call technical support and they say to call the gas company to check the gas pressure, which the gas company has since said there was no problem with the pressure. I call support back and they say to clean this or do this and do that, with every day that passes no hot water. Finally I asked for them to give me a number to have a technician to come out and look which I have to schedule. If the unit was working fine for a few months and now failing intermittently there must be a bad part. Day 3 no hot water. I would return the unit if I could and I wish I would have read the customer reviews prior to purchasing, I recommend buying a different product if you have the option.
Date published: 2016-03-09
Rated 5 out of 5 by from Working Because this new model has an ignition instead of a pilot light, it stuck out more in front. The heater had to to pivoted sideways to fit into the closet that the previous heater was in. All the metal tubing for the input cold water and output hot water had to be adjusted for this rotation. NONE of the measurements given accounted for the ignition system taking more space. Fortunately I spotted this before the heater was entirely installed and the workmen left. But the water had to be drainied and new tubing and plumbling bought to complete the installation. Hope it lasts longer than the warranty.
Date published: 2016-04-10
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