Hot Tub Models By Caldera From Relax Essex, The best Hot Tub Models in the UK

Our breakthrough innovation has solved the #1 concern of hot tub shoppers everywhere – water care!

The FreshWater Salt System is a simple and intuitive approach to water care that drastically reduces the amount of time spent maintaining your spa, so you can relax and experience the wellness benefits of daily hot tub use.

Caldera Utopia


The pinnacle of comfort, design and performance, Utopia Series models are simple to maintain and unmatched in luxury. Its FreshWater Salt System keeps water clean up to three times longer.


Seats 8 Adults | 274 x 231 x 97 cm | 74 jets


Seats 6 Adults | 226 x 226 x 97 cm | 55 jets


Seats 7 Adults | 226 x 226 x 97 cm | 52 jets


Seats 6 adults | 213 x 213 x 91 cm | 48 jets


Seats 6 Adults | 213 x 213 x 91 cm | 46 jets


Seats 4 Adults | 198 x 213 x 89 cm | 43 jets

Caldera Paradise


The Paradise Series has models sized for three to seven adults all with a blend of practical functions and premium options for an immersive hydrotherapy massage.
Caldera Vacanza
The Vacanza Series hot tubs have been thoughtfully designed with options that provide the broadest range of therapeutic benefits at the greatest value.

Automatic Heat & Filtration
Always hot and ready spa water with an automatic heating and filtration system.

The Foot Ridge
The Foot Ridge support provides a convenient anchor point.

Caldera Spas
At Caldera, we do more than sell hot tubs. We design and carefully construct a product with extraordinary benefits.


All Caldera® Spas feature FiberCor® an innovation that revolutionises spa insulation. Applied at 32kg/m3 density, FiberCor is 4-times denser than regular 8kg/m3 Urethane foam.

EcoTech cabinet

The exclusive EcoTech cabinet, with its rich colours and embossed grain, offers the aesthetic appeal of real wood while providing the durability and easy care.

The Foot Ridge

The Foot Ridge support provides a convenient anchor point to help you remain stationary while powerful jets work their magic.