Santi BZ420X Heated Undersuit Combo

The comprehensive Santi Heated BZ420X Undersuit Combo package provides a complete, ready-to-go heating solution for serious divers. This set includes the flexible Heated BZ420X Undersuit, a powerful Blue Power 28Ah Battery, and a Thermovalve 303 or Drysuit Connector. 

Santi BZ420X Heated Undersuit

The Santi BZ420X Heated Undersuit represents an advanced evolution of Santi’s flagship model for drysuit diving. It provides unparalleled thermal comfort, even in extreme conditions, thanks to significant construction improvements. 

This heated undersuit protects the entire body by evenly warming the trunk, thighs, and arms. For the best results, you should wear it over a thin base layer to transfer heat directly to your skin. Consequently, you remain warm and comfortable underwater even if your battery power becomes low or completely drained.

Furthermore, the new cable layout ensures more efficient heating and much better heat distribution across the body. The improved "brick" quilting pattern enhances flexibility while providing a more ergonomic fit. Additionally, the smooth inner material allows you to don and doff the suit with much greater ease.

• Maximum heating temperature of 45°C with 110W of power.
• Heating elements positioned strategically on the torso, thighs, and arms.
• Thick inner layer (290g/m2) and robust outer layer (420g/m2).
• Includes integrated cables in the sleeves for easy heated glove connection.
• Features P-valve holes on both sides and water-resistant cuffs as standard.
• Ergonomic wiring allows for unrestricted movement and a natural body fit.
• Available in men's and women's sizes.

Santi Blue Power Battery 28Ah

The Santi Blue Power Battery 28Ah introduces a new generation of reliable power for your heating system. This battery allows you to maintain a constant heating temperature throughout your entire dive for up to 3 hours. 

This battery distinguishes itself by maintaining a stable voltage level regardless of the remaining charge. You can choose between two output levels: 11V for standard warmth or 12V for higher heating needs. 

Moreover, the piezoelectric button ensures failure-free operation even in the most demanding underwater environments. Furthermore, the ergonomic anti-slip casing makes it very easy to handle while on the surface. Finally, the audible and luminous indicators clearly indicate your battery mode and low-charge levels. < Click for Full Description >

Drysuit Connector vs. Thermovalve 303

The Santi Drysuit Connector links your Santi Heated Vest Flex 2.0 to an external battery via your existing inflation valve. You simply install the connector underneath your current drysuit inflation valve to maintain full inflation functionality. < Click for Full Description >

In contrast, the Santi Thermovalve 303 fully replaces your existing inflator valve with a streamlined, dual-function unit. The Thermovalve features a 270-degree rotating head to improve hose routing and flexibility. Consequently, you can customise your setup to suit your specific diving preferences. < Click for Full Description >

FREE "Made to Fit"

Very few divers require a totally made to measure suit due to the wide range of standard sizes available from Santi Diving. With this in mind, Santi offers a free of charge Made-to-Fit service to any standard size Heated Flex 2.0 Undersuit ordered, sculpting standard suits to a divers' measurements.

With your order, you can request up to 4 changes (ranging from 2 to 5 cm) to any of the standard size measurements listed under chest, inner arm, biceps, forearm, waist, hips, inner leg, thigh, calf or body trunk on the Santi size chart.

If you would require more than 4 changes to make your suit perfect, you can add two more changes for a small additional charge.

Santi Heating Systems at glance

The Santi Heated BZ420X Undersuit has been designed as part of the Santi heating system, which currently includes items such as the Santi Heated Flex 2.0 Undersuit, Heated Vest Flex 2.0 and Heated Gloves.

Want to know which batteries can be used with Santi heating systems and decide which suits you best? Check out our Comprehensive Review of Batteries for SANTI Heating.

Read our SANTI Thermovalve and Drysuit Connector comparison.