The Santi BZ420X Heated Undersuit Combo Set includes the Santi BZ420X Heated Undersuit, Santi Blue Power 28Ah Battery and Drysuit Connector or Thermovalve. All in a neat package – ready to go.

BZ420X Heated Undersuit

The Santi BZ420X Heated Undersuit is an advanced version of Santis flagship model, designed for even greater warmth and comfort while diving in a drysuit.

It offers unparalleled thermal comfort even in extreme conditions thanks to construction improvements and new materials.

The heated BZ420X undersuit is designed to comprehensively protect the whole body of a diver from the cold. The heated undersuit heats the trunk, thighs and arms evenly.

It is designed to be worn on top of a thin base layer allowing most of the generated heat to be passed directly to the divers body.

The heated Santi undersuit gives you the best thermal protection underwater. It keeps you warm and comfortable while heating, even when the batteries are low or completely drained.

Whats new in the BZ420X Heated Undersuit?

A high-quality and thicker inner layer provides superior thermal insulation, making it warmer than BZ400 Extreme.

The new cable layout ensures more even heat distribution and more efficient heating.

A new, smooth inner material makes donning and doffing easier.The brick pattern of the improved quilting enhances flexibility and body fit.

Specifications

• Operating time on 28Ah battery: approx. 3hrs
• Grammage: inner layer 290g/m2; out layer 420g/m2
• Mens and womens sizes
• WARNING: works only with SANTI Thermovalve and SANTI Drysuit Connector
• Dont combine with other connectors or batteries higher than 12V
• Maximum heating temperature: 45C
• Maximum heating power: 110W
• Temperature and overcurrent protection
• Retains insulating function even when heating is off
• Ergonomically placed wiring for unrestricted movement
• Heating elements positioned on the torso, thighs, and arms
• Extra pocket for power cables
• Waterproof connector compatible with other Santi products, flexible and damage-resistant cable
• Additional cables in sleeves for heated gloves connection
• Elastic waistband
• P-valve holes on both sides in standard
• Two sides pockets
• Water-resistant cuffs
• Straps at cuffs to allow air release and prevent sleeve slipping
• Two-way zipper

FREE “Made to Fit” service

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 Santi BZ420X Undersuit ordered, sculpting standard suits to a divers’ measurements.

With your Santi BZ420X Heated Undersuit Combo 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.

Thermovalve or Drysuit Connector?

Both the Santi Thermovalve 303 and the Drysuit Connector are used to connect an external power source to yourSanti heated vest, heated gloves or heated undersuit. Both are available in Apeks or SiTech fittings.

The SANTI Drysuit Connector does this by being attached to your existing drysuit inflation valve, continuing to use the original valve for inflation and running power through the connector element. It adds 19mm height to your valve.

Thermovalve 303s great advantage is placing the cable with the E/O connector in the down position, with the possibility of turning the head by 270 degrees, which allows for trouble-free connection of the hopper cable both in the position of the connector to the right and left.

Read our SANTI Thermovalveand Drysuit Connector comparison

Santi Blue Power Battery

The Santi Blue Power Battery Large – 28Ah marks the beginning of a new generation of batteries dedicated to the Santi heating system(s) with double the power of the newBlue Power Medium 14Ah battery.

Uniting modern technology and contemporary electronics, the Santi Blue Power battery will allow you to enjoy uninterrupted and unflagging heat comfort over time.

With its two settings, the Santi Blue Power battery allows 2 levels of heating and independent, non-invasive (field) replacement of the power cable if necessary.

The difference

Several important features distinguish the Santi BluePower battery from other batteries available on the market:

• The ability to maintain astable voltage level, thus maintaining a constant heating temperature throughout the battery’s run time during a dive.
• Two levels of constant voltage output set by the user as needed: (1) For typical heating power needed – Operated at 11V; (2) For higher heating power needed – Operated at 12V
• A newergonomic designof the E/O cord connector with two LEDs
• Audible and luminous indicationof the battery mode along with an indication of low charge level.
• Anti-slip casing and ergonomic shape are particularly useful on the surface.
• The possibility of simplefield replacement of the E/O cordcable in the selected length without having to send it for service.
• A newfailure-free piezoelectric button.

Maximum operating times

• Santi Heated undersuit(110W): 3h
• Santi Heated vest(55W): 6h
• Santi Heated gloves (36W): 10h
• Santi Heated undersuit with gloves(146W): 2h 20min
• Santi Heated vest with gloves(91W): 3h 30min

What does the value represented in watt-hours mean?

Santi Blue Power batteries are available in two capacities, medium (14Ah) and large (28Ah).

In the case of the 198Wh Blue Power Medium 14Ah Battery setting the diver will have 198W of power to use in one hour. The diver will have 99W to use in two hours, and in four hours, about 45W.

Example 1:
Santi’s heating vest has 55W + heating gloves 36W – a total of 91W. So 198Wh with a 14Ah battery will allow the equipment to be used for: 198Wh / 91W = 2.17h or about 2 hours and 10 minutes.

Example 2:
The heating gloves have 36W. So 397Wh with Blue Power Large 28Ah will allow heating gloves for: 397 Wh / 36W = 11.02h or about 11 hours.

The above result is also affected by the temperature at which the battery operates.

What systems can the Santi Blue Power battery be used for?

Regardless of which battery you choose, the Santi Blue Power battery is exclusively designed for powering the Santi heating system components. The technology employed in the batteries is not compatible with other devices.

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

Santi Heating Systems at glance