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- USA
- CAN
Ships within 48 hours · Estimated delivery Jul 17 - Jul 22
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For Your Every Summer RSVP, with Code: SUMMER15
Description
Performance 40 Gal. Tall 6-Year 36,000 BTU Ultra Low NOx (ULN) Power Vent Natural Gas Tank Water HeaterThe Rheem Performance 40 Gal. Tall Ultra Low NOx Natural Gas Power Vent offers flexible venting options up to 100 ft. using PVC, ABS or CPVC vent pipe options. Unit can be vented either vertical or horizontal termination. Unit certified for application up to 5,999 ft. above sea level. Maintenance free, no filter to clean. California residents see Prop 65 WARNINGS California residents, this water heater meets or exceeds ultra low NOx (ULN) emissions
The Rheem Performance 40 Gal. Tall Ultra Low NOx Natural Gas Power Vent offers flexible venting options up to 100 ft. using PVC, ABS or CPVC vent pipe options. Unit can be vented either vertical or horizontal termination. Unit certified for application up to 5,999 ft. above sea level. Maintenance free, no filter to clean.- California residents
- California residents, this water heater meets or exceeds ultra-low NOx (ULN) emissions requirements for all air quality management districts
- More hot water at a low operating cost
- Exclusive air/fuel shut-off device for double protection
- Maintenance free - no filter to clean
- Disables the heater in the presence of flammable vapor accumulation
- PVC, ABS or CPVC vent pipe options
- Vertical or horizontal termination
- Premium grade anode rod provides long-lasting tank protection
- Whisper quiet blower
- Uniform Energy Factor (UEF) 0.60
- Call 1-855-400-2552 before noon for same-day installation service in most areas, or
Features
| Item Weight | 147 |
| Nominal Tank Capacity (gallons) | 40 |
| Maximum Temperature (F) | 160 |
| Efficiency Level | High |
| Gas Type | Natural Gas |
| Returnable | 90-Day |
| BTU Rating | 36,000 |
| Tank Lining Material | Glass |
| Water Heater Features | Overheat Protection,Pilot Light Window,Pilot Reset Button,Temperature Pressure Relief Valve,Ultra LoNox |
| Household Size | 2-4 |
| Minimum Temperature (F) | 45 °F |
| Wattage (watts) | 0 |
| Tank Warranty | 6 Year |
| Vent Type | Power Vent |
| Rated Tank Capacity (gallons) | 38 |
| Product Weight (lb.) | 147 lb |
| Water Heater Profile | Tall |
| Finish Family | Gray |
| Indoor/Outdoor | Indoor |
| Uniform Energy Factor | 0.64 |
| Fuel Type | Gas |
| Application Type | Residential |
| Commercial/Residential | Residential |
| Pack Size | 1 |
| Recovery Rate at 90F Rise (gallons/hour) | 36.4 |
| Product Height (in.) | 67.375 in |
| Product Depth (in.) | 19.75 in |
| Product Width (in.) | 19.75 in |
| Water Connection Size (in.) | 0.75 |
| Tank Valve Size (in.) | 0.75 |
| Part Warranty | 6 Year |
| Certifications and Listings | CSA Listed,FVIR Certified |
| Labor Warranty | 1 Year |
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
4.0 ★★★★★
Based on 27 reviews
Sort
Product Reviews
★★★★★ 5
Fit is great!
Size: 6-10, Color: Halo Gray/Assorted
These socks fit perfectly and never slip!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 9, 2026
★★★★★ 5
Absolutely Essential for Any Athlete or Gym-Goer!
Size: Large, Color: (035) Steel / White / Black
I recently purchased the Under Armour Unisex-Adult Training Cotton No Show Socks 6 Pack, and I must say, they've become an indispensable part of my workout gear. Here's why these socks are a game-changer:
Comfort Above All: These socks are incredibly comfortable. Made from a blend of cotton and synthetic fibers, they provide just the right amount of cushioning without feeling bulky. Whether I'm running, lifting weights, or doing yoga, my feet feel supported yet free.
No Show, All Go: True to their name, these socks stay perfectly in place without slipping down into my shoes. This is crucial for maintaining a professional look at the gym or during sports activities. No more embarrassing sock peeks or having to constantly adjust them.
Durability: For the price, these socks hold up remarkably well. I've washed them multiple times, and they haven't lost their shape or elasticity. They've survived the rigors of both my workouts and laundry day.
Breathability: The material mix allows for excellent breathability. My feet stay dry and cool, reducing the chances of blisters or discomfort during long sessions.
Pack Value: Getting six pairs in one go is fantastic. It means I always have a fresh pair ready, which is perfect for someone like me who works out frequently.
Fit for All: These socks fit true to size and are designed to be unisex, making them a versatile choice for anyone looking to upgrade their sock game.
If you're in the market for socks that combine comfort, performance, and style, look no further. Under Armour has nailed it with these no-show socks. They've quickly become a staple in my wardrobe, and I find myself reaching for them over any other sock I own. Highly recommended for anyone serious about their fitness routine or just wanting reliable, high-quality socks.
5 out of 5 stars - These socks are a must-have!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 25, 2024
★★★★★ 5
My Husband’s Favorite Socks
Size: Large, Color: (035) Steel / White / Black
The Under Armour Unisex Training Cotton No Show Socks have become my husband’s absolute favorite socks—and he’s pretty picky about socks.
Comfortable Fit:
They’re soft, comfortable, and fit well without being too tight. They stay in place all day with no slipping or bunching.
Great for Everyday Wear:
Perfect for workouts, walking, and everyday use. They provide just the right amount of cushioning without feeling bulky.
Durable & Long-Lasting:
These hold up really well through regular wear and washing. They keep their shape and don’t wear thin quickly.
Reliable Under Armour Quality:
You can tell they’re well made. Consistent quality that matches what you expect from Under Armour.
Overall Impression:
When someone has a favorite sock and keeps reaching for it, that says everything. These are comfortable, durable, and dependable.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 30, 2025
★★★★★ 5
Quality Under Armour socks
Size: Large, Color: (100) White / White / Black
Nice medium thick sock that is breathable but cushioned. It stays put in the show and doesn’t fall down. Fit is true to size, no show/minimal show
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 2, 2026
★★★★★ 5
Perfect Pairs
Size: Large, Color: (100) White / White / Black
Very comfortable, soft & affordable..
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 19, 2026
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