The Onyx hot tub, winner of the WhatSpa? Best Buy Award 2025, is one of the most powerful models in the Platinum Spas Premium Range, with 90 jets powered by 4 x 2 HP pumps, creating exceptional hydrotherapy. Its Superior Aristech Acrylic shell comes in 3 colours, Midnight Canyon, Sterling Silver and Odyssey.
 
The Onyx hot tub has a slightly different shape to most of the Platinum Spas Premium range, featuring more modern, angled and sharper corners, making it a great choice for contemporary gardens.
 
Its two-lounger layout makes it a great option if you want your spa to become a dedicated part of your routine. By using the loungers, you’ll get hydrotherapy massage jets directly targeting your back, shoulders, legs and feet all at once. All you have to do is lie back and enjoy.
 
It features an integrated Bluetooth sound system and is compatible with a Wi-Fi app–based remote control (the Balboa Wi-Fi module can be purchased separately). This makes it an excellent choice for busy family homes, entertaining friends, or a more streamlined solo relaxation experience.
 
Why Choose An Onyx Hot Tub?
For years, Platinum Spas has focused on designing hot tubs that owners genuinely love. Every model is built to deliver outstanding hydrotherapy while remaining efficient, reliable and easy to own.
 
Trusted worldwide, every model is engineered with comfort, efficiency and reliability in mind. The Onyx brings these qualities together in a spa that’s designed to perform just as well in everyday use as it does on the showroom floor.
 
Premium Water Care
Clean water is essential to every enjoyable hot tub experience. The Onyx hot tub features Platinum Superior-Zone, our patented ozone sanitation system, which helps maintain water quality while reducing the amount of chemicals required.
 
Energy-Efficient All Year Round
This 5 person hot tub model is equipped with Platinum Premium Shield Thermal Panels, working alongside a thermo-wrap lining to retain heat more effectively and reduce energy consumption. Better insulation means lower running costs throughout the year.
 
Designed for Everyday Comfort
The combination of upright seats and two full-length loungers makes the Onyx suitable for a variety of bathing styles. Whether you’re sharing the spa with family or stretching out in a lounger after a workout, every seat has been designed to deliver effective hydrotherapy and lasting comfort.