- Manufacturer: Harmonic Hot Tubs
- Brand: Harmonic Hot Tubs™
- Collection: Hot Tubs
- Model: H28RB Standard
- Year: 2026
Thank you for the excellent service Dannie fixed me up in purchasing my hot tub same day didnt get other girls name but they loaded me thank you!
Nick went above and beyond to find the supplies I needed Very helpful professional and friendly. Thank you!
I don't ever leave reviews, but these folks are so worthy of 5 stars I couldn't resist this post. We shopped every store in a 100 mile radius of our house for a perfect hot tub coupled with great service, and were completely at odds until we arrived at Luther Stem. Hands-down the most knowledgeable staff we met during our search. Dannie was the best, and answered every question we had, and we had many! There was no doubt we had found the company we wanted to work with, and we purchased a Harmonic tub the next day. And delivery? Totally professional. Delivered and installed TWO DAYS later. You won't get that from any of the big chain stores. I promise. Thanks so much you all!
Fast service, helpful technicians! We have now had Luther Stem install a new liner for our pool after it floated and became a terrible eyesore. They have also serviced/repaired our pool pump and sump pump. They respond quickly and are so informative. Derick was very helpful and full of good information. Highly recommend!
Went in having questions on a new spa I had purchased . The employees were very knowledgeable and customer service oriented. Left with what I needed and valuable information. I will definitely return. Great experience!
Very good experience with Luther Stem! Friendly Saleslady! All employees were knowledgeable!
The H28RB Hot Tub combines style, comfort, and performance in a unique round design. With 8 thoughtfully positioned seats and 76 jets—including 10 TurboBoost Jets—this spa delivers a powerful and balanced hydrotherapy experience for groups or families. Its round shape creates a more social, open layout while maintaining premium features. Equipped with a touchscreen keypad, 2 high-performance jet pumps, and 4 elegant laminar jets, the H28RB is as visually striking as it is functional. The interior features a durable acrylic/fiberglass shell, while the HDPE synthetic cabinet provides long-lasting protection. With built-in ozone sanitation, Silver Ion mineral filtration, and vibrant LED lighting, it’s the perfect blend of performance and ambiance.
| Size | 93 x 40 x 40 in 236 x 102 x 102 cm |
| Water Capacity | 400 gal / 1,515 ltrs |
| Dry Weight | 870 lbs / 395 kg |
| Filled Weight | 4,206 lbs / 1,909 kg |
| Unique Seats | 8 |
| Electrical | US 240v 50 amp UK/EU 230v 32 amp |
| Heater | US 4kW UK/EU 3kW |
| Topside Control | Touchscreen |
| Exterior Lighting | 4 |
| Interior Lighting | 12 |
| Ozone & Chamber | Yes |
| Filtration | 1 Micro Screen w/ Silver Ion Minerals |
| Pump | US (1) 4 hp 2 spd & (1) 4hp 1 spd UK (1) 3 hp 2 spd & (1) 3 hp 1 spd |
| Total Jets | 76 |
| Turbo Boost | 10 |
| Neck Jets | 0 |
| Turbo Boost Controls | 2 |
| LED Waterfall | No |
| LED Laminar Jets | 4 |
| Acrylic Options | Alabaster Wave, Silver Marble, Sahara, Pearl, Espresso, Ocean Wave, Pewter |
| Exterior Cabinet | Coastal or Ebony |
| Cover | PolyTek |
Color Options:
Shell:
- Silver Marble
- Alabaster Wave
- Espresso
- Ocean Wave
- Sahara
- Pewter
- Pearl
Cabinet Finish:
- Sable
- Ebony
- Coastal
- Black
- Gray
Features:
Turbo Boost Whirlpool System
- Multi-sized jets target different muscles
- Swirling motion + heat + pressure
- Various switchable modes
Harmonic LED Illumination
- Evening-ready illumination settings
- Backlit controls for effortless navigation
- Enhances mood and safety with lighting
Harmonic Balance Water Management System
- Automatic filtration twice daily
- Fresher water with less maintenance
- Filters debris and bacteria
Low-Profile Delta Hydrotherapy Jets
- Spa-like experience to reduce stress
- Precise pressure control for deep relief
- Full-body hydrotherapy massage
Frame Built For Durability
- 15-ply cross-laminated frame for unmatched support
- High-density foam for stability & insulation
- Full-circumference: interlocking design built with 2” dimensional lumber
Heavy Duty Cabinet
- Weather-resistant HDPE cabinets
- Sleek design complements for any setting
- Reflects your personal space & style
Stylish Color Options
- All elegant shell color options
- Complements any backyard aesthetic
- Durable finishes that stay vibrant over time
- Lets you personalize your hot tub to your style
- Ozonator
- Locking Cover
- Touchscreen Control
- Laminars (Water Ropes)
- Bench Seating
- Made in USA
- Manufacturer: Harmonic Hot Tubs
- Brand: Harmonic Hot Tubs™
- Collection: Hot Tubs
- Model: H28RB Standard
- Year: 2026
Thank you for the excellent service Dannie fixed me up in purchasing my hot tub same day didnt get other girls name but they loaded me thank you!
Nick went above and beyond to find the supplies I needed Very helpful professional and friendly. Thank you!
I don't ever leave reviews, but these folks are so worthy of 5 stars I couldn't resist this post. We shopped every store in a 100 mile radius of our house for a perfect hot tub coupled with great service, and were completely at odds until we arrived at Luther Stem. Hands-down the most knowledgeable staff we met during our search. Dannie was the best, and answered every question we had, and we had many! There was no doubt we had found the company we wanted to work with, and we purchased a Harmonic tub the next day. And delivery? Totally professional. Delivered and installed TWO DAYS later. You won't get that from any of the big chain stores. I promise. Thanks so much you all!
Fast service, helpful technicians! We have now had Luther Stem install a new liner for our pool after it floated and became a terrible eyesore. They have also serviced/repaired our pool pump and sump pump. They respond quickly and are so informative. Derick was very helpful and full of good information. Highly recommend!
Went in having questions on a new spa I had purchased . The employees were very knowledgeable and customer service oriented. Left with what I needed and valuable information. I will definitely return. Great experience!
Very good experience with Luther Stem! Friendly Saleslady! All employees were knowledgeable!
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2026 Harmonic Hot Tubs™ H157L Hot Tub
- In StockNew
- Location Fort Smith Showroom
