Harmonic Hot Tubs · 5–10 Seater Collection
Harmonic H28RB
A round 8-seat spa with 76 jets and an open, social layout for families and groups.
- 8Seats
- 76Jets
- 400 galWater volume
- 93" round x 40"L × W × H
Standard (240V) Available to order
- 2 high-performance jet pumps and 4 elegant laminar jets.
- Equipped with a touchscreen keypad and vibrant LED lighting.
- Built-in ozone sanitation and Anti Microbial filtration.
About the H28RB
The H28RB is a round 8-seat spa with 76 jets, including 10 TurboBoost Jets. Its circular design creates an open, social layout while delivering powerful hydrotherapy for families or groups.
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, Anti Microbial filtration, and vibrant LED lighting, it’s the perfect blend of performance and ambiance.
Specifications
| Seating | 8 Seats |
|---|---|
| Dimensions | 93" round x 40" |
| Water volume | 400 gal / 1,515 ltrs |
| Total jets | 76 |
| Dry weight | 870 lbs / 395 kg |
| Filled weight | 4,206 lbs / 1,909 kg |
| Electrical | US 240v / EU 230v |
| Power type | Standard (240V) |
| Seating style | Open seating |
| Controls | Touchscreen |
| Heater | US 4kW / UK/EU 3kW |
| Exterior Lighting | 4 |
| Interior Lighting | 12 |
| Ozone & Chamber | Yes |
| Filtration | 1 Anti Microbial Filter |
| Pump | US (1) 4 hp 2 spd & (1) 4hp 1 spd / UK (1) 3 hp 2 spd & (1) 3 hp 1 spd |
| 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 | Standard: Coastal or Ebony HDPE |
| Cover | PolyTek |
Specifications are provided by the manufacturer and may change without notice. Please confirm details with our store before ordering.
Part of: 5–10 Seater Collection
H28RB finishes
Choose your shell & cabinet
Acrylic shell
Aristech acrylic shells reinforced with fiberglass – choose the look that suits your backyard.
Alabaster Wave
Silver Marble
Sahara
Pearl
Espresso
Ocean Wave
PewterHDPE cabinet
Durable HDPE cabinets offering an industry-leading 10-year weather-resistant protection.
Coastal
EbonyHover or tap a finish to read more. Standard finishes are included in the base price, Upgrade finishes cost extra. Availability can change – colours on screen may differ, see samples in store.
Pricing & availability
Get a quote for the Harmonic H28RB
Tell us a little about your backyard and timing. The store closest to you will reply with current pricing, available colours, delivery options and what you need for the base and electrical.
- No-obligation quote
- Help with base, access and electrical planning
- Financing options available
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Built into every Harmonic
The Harmonic advantage
Premium & Sophisticated Look
Create a spa dreamscape that blends beautifully with your outdoors, powered by Harmonic’s premium finishes. Each material is carefully curated to complement natural elements, modern homes, and outdoor lounge spaces.
Matte (Alabaster Wave)
Features AVONITE™ Flex for real, reliable grip. Independent tests show it’s twice as slip-resistant as glossy acrylics.
Gloss Marble Options
Silver Marble, Ocean Wave, and Espresso combine streams of color into a swirl design reminiscent of nature.
Textured Options
Pewter, Pearl, and Sahara add shimmer for a luminescent granite-like hot tub surface.
Durable Cabinets
Coastal and Ebony HDPE cabinets offer an industry-leading 10-year weather-resistant protection.
Delta Low Profile Jets
A powerful hydrotherapy solution designed to deliver targeted relief through high-performance water jets. Engineered for maximum comfort and muscle recovery, this system provides a deep-tissue massage experience.
- Low Profile: Hugs the surface for a seamless look and feel.
- Adjustable: Rotate the Jet Face to seamlessly turn water flow on or off.
- Interchangeable: Place them to best suit your personal hydrotherapy needs.
- Directional Jet: Position them side to side or up and down for targeted relief.
- Rotating Jets: Available in single or double nozzle configurations.
Harmonic Pure™ & Active Skim™
Advanced self-cleaning technology for naturally purer, low-maintenance hot tub water. The electronic control system automatically activates twice a day for a deep-cleaning filtration cycle.
Silver Shield Micro Screen
Captures contaminants as small as 1 micron, with Silver and Zinc embedded directly into the cartridge to help eliminate bacteria.
Active Skim™ Filter
Continuous, silent skimming action effective at both high and low pump speeds. No gates or telescoping tubes to jam.
ClearCore™ Ozone Reaction Chamber
Combines injection, diffusion, mixing, and reaction time into a single core. It kills 99% of bacteria, continuously oxidizes fine particles, and significantly reduces the need for chlorine or bromine.
Built for Relaxation. Certified for Protection.
Every Harmonic Hot Tub is certified to meet rigorous safety standards, giving you peace of mind with every soak. From electrical systems to advanced anti-entrapment designs, each detail is engineered to protect you.
- ETL Listing: Indicates the product has been independently tested and complies with North American safety standards.
- CEC Compliance: Meets strict energy efficiency standards set by the California Energy Commission.
- Recognized Satellite Laboratory: The Harmonic factory has invested heavily in in-house product testing facilities and passed rigorous standards.
Harmonic Glow
Elevate your evenings with our sophisticated LED system that enhances safety, deepens mood, and guides you effortlessly after dark.
As much of your time in the hot tub is spent during the evening, Harmonic Glow provides essential illumination for a secure, serene environment. The intuitive controls are softly backlit, ensuring effortless navigation after dusk.
Under Water
Topside
Exterior
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Where to see Harmonic hot tubs
Stop by for free water testing, pool and spa supplies, or to see hot tubs in person. Call the store closest to you.
Gardendale
~9 mi from downtown Birmingham
Store hours
1054 Main St
Gardendale, AL 35071
Gardendale, AL 35071
Store hours
- Mon – Fri
- 9am – 5pm
- Sat
- 9am – 3pm
- Sun
- Closed
Pell City
~31 mi from downtown Birmingham
Store hours
1507 Martin St S #3
Pell City, AL 35128
Pell City, AL 35128
Store hours
- Mon
- Closed
- Tue – Thu
- 9am – 5pm
- Fri
- 9am – 6pm
- Sat
- 9am – 2pm
- Sun
- Closed