Blue Heat Liner

Diving Unlimited International

DUI Part Number: 208341

Product Description

BlueHeat liner are lightweight and comfortable jumpsuits made with soft next-to-skin fleece and lycra outer for easy donning and doffing / with anti-microbial lining.  These heated undergarment offer torso warming in three output options: 50, 75, and 100 percent. 

To ensure safety and protection by encasing BlueHeat wiring ( industry leading / high strand Microwire®) with a thermal protective jacket. Additionally, internal heating pads have independent thermostats and diver protection circuits.

Technical divers have understood for decades that passive insulation is not always enough for ultra-long underwater exposures. As a pioneer in Hot Water suits, DUI developed the only active heating technology designed to be used safely underwater.  While many competitors make 12 volt systems DUI made a system that runs on 6 volts DC within the suit.  The combination of the lower voltage and circuit protection keep the diver safe in the rare case of a suit flood. The variable heat settings allow the diver to control the heat output in order to better control the warmth to duration ratio. 

Sizes: XS S M L XL XXL


  • Full torso heating with selectable output of 50%, 75% and 100%
  • Heating pads made with high strand Microwire® encased with a thermal protective jacket
  • Four heating pads have independent thermostats and diver protection circuits
  • Liner designed with conduit tunnels for optional accessory wiring harness
  • 6.9V complies to diver safety standards
  • Get 2 hours of 100% power
  • NEW! 3XL and 4XL available upon request. ($1099)

Customer Feedback:

DUI has done it again! Many years of diving cool waters of California, I discovered the DUI self-donning drysuit and then the Weight & Trim System. These products make cool water diving enjoyable. I thought it could not get any better until I tried DUI’s BlueHeat. WOW this is a total game changer! Your adjustable, battery powered undergarments that controls a diver’s ability to adjust my own warmth is groundbreaking. I laid along the bottom watching the baby Dungeness crabs walk by, testing the ON and OFF buttons of your battery. ON was a fantastic experience, an underwater fire ring across my chest and back without the smoke. I can only describe OFF as; “Why did I turn it OFF, I want it back ON!”  Learn more about Lance Milbrand, Underwater Photographer, at

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