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Description
Universal Heavy Duty 100 gal. 270K BTU Ultra-Low NOx (ULN) Commercial Natural Gas Tank Water HeaterRheem Commercial Universal Ultra Low NOx (ULN) Natural Gas Water Heaters are designed to fit into tight retrofit applications and have the features and capacity to meet heavy duty demands. The tighter the commercial retrofit, the more you will appreciate how the Universal's compact size and multiple water connections simplify installations. Top, Front and Rear water inlets outlets offer installation flexibility giving this water heater the name:
Rheem Commercial Universal Ultra-Low NOx (ULN) Natural Gas Water Heaters are designed to fit into tight retrofit applications and have the features and capacity to meet heavy duty demands. The tighter the commercial retrofit, the more you will appreciate how the Universal's compact size and multiple water connections simplify installations. Top, Front and Rear water inlets/outlets offer installation flexibility giving this water heater the name: Universal. Please Note: This model requires a 120-Volt power source.- California residents
- California and Utah residents (Utah effective 7/1/18): this water heater model meets or exceeds Ultra-Low NOx (ULN) emissions requirements for all air quality management districts
- Texas residents: this water heater model meets or exceeds Low NOx (LN) emissions requirements for all air quality management districts
- Space saver design: the short heights and narrow jacket diameters, plus the top, front and rear water inlets/outlets offer the ultimate in installation flexibility
- System sentinel LED diagnostic system: our exclusive diagnostic system, with glowing LED lights, verifies system operation sequence by sequence
- Strong tank design: universals proprietary steel formulation, patented multi-flue design, combined with 2-coats of porcelain enamel, results in a superior heat exchanger design
- Stainless steel burners: precision burners, raised port design are formed from high chromium stainless steel; each burner assembly slides out like a drawer for quick inspection and maintenance
- Low profile automatic flue damper: low profile damper minimizes overall product height and heavy-duty vent hood supports are designed to withstand the rigors of installation
- Easy to service: factory installed full port, full flow brass drain valve allows for faster draining and servicing and hand-hole cleanout for easy removal of lime/sediment deposits
- Direct spark to pilot ignition system: saves energy by igniting only when there is a call for heat
- Built-in corrosion resistance: patented anode design utilizes multiple magnesium rods to ensure corrosion resistance for a long tank life
- Fully insulated: energy saving sag and moisture proof fiberglass insulation surrounds the storage tank and heavy mineral wool insulation surrounds the combustion chamber
- Insulation: sag and moisture proof fiberglass insulation surrounds the storage tank and heavy mineral wool insulation surrounds the combustion chamber
- Gas control system: thermostat adjusts from 100°F to 180°F, 24-Volt combination gas valve includes main gas pressure regulation, on-off manual valve, 120-Volt/24-Volt transformer and high limit temperature cut-out
- Call 1-855-400-2552 before noon for same-day installation service in most areas, or
Features
| Item Weight | 805 |
| Uniform Energy Factor | 0 |
| Tank Lining Material | Glass |
| Recovery Rate at 90F Rise (gallons/hour) | 291 |
| Commercial/Residential | Commercial |
| Application Type | Commercial |
| Returnable | 180-Day |
| Water Heater Features | Glass-Lined Tank,Overheat Protection,Temperature Pressure Relief Valve |
| Minimum Temperature (F) | 100 °F |
| Tank Warranty | 3 Year |
| BTU Rating | 270000 |
| Wattage (watts) | 0 |
| Maximum Temperature (F) | 180 |
| Water Heater Profile | Tall |
| Finish Family | Gray |
| Indoor/Outdoor | Indoor |
| Fuel Type | Gas |
| Pack Size | 1 |
| Vent Type | Atmospheric |
| Product Weight (lb.) | 805 lb |
| Nominal Tank Capacity (gallons) | 100 |
| Household Size | 5+ |
| Product Width (in.) | 30.25 in |
| Product Depth (in.) | 30.25 in |
| Product Height (in.) | 73.875 in |
| Water Connection Size (in.) | 2 |
| Tank Valve Size (in.) | 0.75 |
| Part Warranty | 1 Year |
| Labor Warranty | No Warranty |
| Certifications and Listings | CSA Listed,UL Listed |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.5 ★★★★★
Based on 1081 reviews
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Product Reviews
★★★★★ 5
Sleep-aid
I've used Oracoat XliMelts for years at night time. I usually only need one for overnight. Keeps my throat dry so I don't keep waking up with a dry mouth.
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Reviewed in the United States on February 8, 2026
★★★★★ 5
Finally A Product that Works For Me
I have severe dry mouth. It's due to medication which I need. It was so bad my tongue would stick to the roof of my mouth and I couldn't open it again. I had really bad gun problems and lots of dental work from the infections that developed. Eventually I had to give Up a valuable medication. That was the last century and toothpaste and mouthwash weren't enough. I am.now taking medication that I wouldn't be able to if it weren't for Xylimelts. I found keeping up with the right mouthwash and using this does the trick. I do need some squirts of Biotene spray. That's instant saliva. Keeping this pouches against the gum has been a game changer. It doesn't show. I don't feel it except when it runs out, gets tiny and crumbles into my mouth. That is about two hours. A friend used it and it lasts four hours. I dont remember if I felt it after the first couple of days. It's curved design makes it undetectable. I think the first day of two I kept checking it stayed in place. It does. It doesn't need any particular placement. I put It on the tip of my finger and wherever it goes is fine. This really works. Finally a product that does work for very dry mouth. At night I put two in and they're still there in the morning. I m a mouth breather so the dry mouth was really hard on me comfort-wise. People try to be kind and suggest you have a drink of water. They don't know it's not thirst. I will say taking sips of whatever you like helps. But in the last century I had to give up a valuable medication because my tongue stuck to the roof of my mouth so badly I couldn't open it again. Really embarrassing. It wasn't healthy for my gums either. This does it for me. I hope this helps other people who suffer from bad dry mouth or need it less often
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Reviewed in the United States on July 17, 2019
★★★★★ 5
I can Sleep Again!
I can get terrible dry mouth while sleeping. These have made it so I can sleep the whole night with out waking up to drink water. I love theses. Gave me back a good nights sleep. I use Two every night. Simple get it a little wet, then I place gently and hold to the outside of the top left molar for a few seconds. The glue will hold it in place with out fear of swallowing. Then I put one on the top right side. They stick well to teeth and can be easily removed. If you leave it alone and fall asleep, it will stay in place for 4-6 hours, providing gentle lubrication to keep your mouth moistened while sleeping. They make your mouth water a little, and the xylitol gives a little lubrication. These are great for mouth breathers and people with sinus issues. These are a real game changer for the better.
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Reviewed in the United States on May 25, 2019
★★★★★ 4
Xylimelts
Have been using for years. So glad they have these without the mint. Just wish they lasted longer at night but they do the job. Taste is pleasant and they are easy to use.
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Reviewed in the United States on December 16, 2025
★★★★★ 5
Dry Mouth Relief
Having been using these for quite awhile now for a severe dry mouth. They really help to make the mouth create saliva, thus protecting the teeth from erosion, etc. They are discs with a dark side which is placed above the teeth on the gum. It will stick there in a minute or two and remains in place until it melts and disappears. I use two at night and have never had a problem with them coming loose, this creating a choking hazard. They remain i place and melt. Sometimes I wake at night and my mouth is dry, so put a couple more in and I'm good to go until morning. I would recommend these to anyone with a dry mouth. There is no bad taste. They are somewhat expensive when using long term, but worth it to me. Have not found them locally, although Walmart has them online...same price or a little more than Amazon. Will continue to buy from these sellers.
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Reviewed in the United States on June 21, 2017