Hollis Review

Best Rebreathers

  • $4,995
  • Easy user interface and very advanced technology
  • User friendly, automated, travel easy, and has all benefits
  • True recreational Rebreather
  • $8,999
  • Lower resistive breathing effort
  • Electronics and the battery are housed on their own outside of the breathing loop
  • Primary HDD (Heads Down Display) is battery driven sequential LED, for continuous hands free monitoring of the oxygen levels.

The Hollis Prism 2 is an electronic fully-closed circuit(eCCR), making it an ideal unit for any kind of diving, including diving in caves and wrecks. It is designed for both automatic and manual operation. Manual operation allows the diver to control the PO2 loop.

One needs only to add cylinders to be ready to dive. The unit itself has an airline-approved hardshell transport case, and without cylinders weighs only 50lb or 22.7kg, making it easy to transport by air.

Training for how to use the equipment is of the utmost importance. According to statistics, there is 5 to 10 times more risk of experiencing an incident while diving with this kind of equipment, than when using open-circuit equipment. This is most likely the result of inferior or insufficient training. Click here to find Hollis Prism rebreather.

The main safety feature on any piece of diving equipment is the diver, and not the bells and whistles.


This unit includes a whole list of features, such as:

  • Waterproofed electronics
  • Electronics housed separately outside the breathing loop
  • Up to 40 hours of battery life with normal 9V alkaline battery
  • PO2 levels can be set manually before a dive
  • Uses standard bottle sizes (Diluent and O2 bottles)
  • On/Off switch magnetized for safety
  • Heads up Display (HUD) allows hands-free monitoring
  • Lightweight – Fully charged: approx. 50 lbs
  • Purge drain on every counterlung
  • Wings fully customizable
  • Design prevents O2 spikes


Hollis, the designer and manufacturer of this unit, is a well-known and trusted brand. The overall impression is that the Prism 2 is a well-designed and carefully-made unit. Attention has been given to details, to make the unit easier to use and better overall. A short list highlighting the main pros would include:

  • Well-made
  • Carefully-designed
  • Easy to use
  • Low resistive breathing effort
  • Easy to breathe, low breath resistance
  • Very quick preparation and packing
  • Easy to travel with
  • Long lasting gas & scrubber allowing multiple dives
  • Audible solenoid firing assures that system is operating correctly
  • Clear plastic housing of radial scrubber makes spotting of water intrusion easy
  • Ready to dive when bought
  • DSV (mouthpiece) design reduces jaw fatigue
  • Total loop flood is prevented by water drain on each of the waterlungs

Reviews of this system are generally positive. Most divers are more than satisfied with this unit and what it delivers. The workmanship is of good quality.

The Prism 2 can be used at a wide range of depths. It can safely be used at all sports depths. This unit has been tested at much greater depths also, but diving deeper than normal sports depths brings various factors into play.

Gas volume does is not a limiting factor when it comes to diving time. It is possible to refill the Prism 2 using gas supplies from an external source. Go to www.kissrebreathers.com/ to search for another types of rebreathers.


  • Expensive, even though much cheaper than competitors
  • Heads up display (HUD) can be difficult to use in the beginning
  • Automatic Diluent Valve (ADV) shut-off not available
  • Refilling scrubber can be a dirty job
  • General maintenance tends to take longer than that of open-circuit equipment


The Hollis Prism 2 is a high-quality piece of equipment. It offers various advantages over normal open-circuit equipment. It does what it was designed to do.

This unit is not perfect. This by no means implies that it is not a very good rebreather. There will always be some complaints, but in the case of the Prism 2 most of these are negligible or due to personal preference.

The fact that the Hollis Prism 2 is manufactured by a well-known and stable manufacturer counts heavily in its favor. The price is also a positive point. The Prism 2 weighs in at about $9,000, which is quite hefty but is still much cheaper than many of the other eCCR’s.

The main factor in deciding for against the Hollis Prism 2 rebreather will be whether you dive enough to justify the expense. Remember that you will also have to factor in the maintenance, training, traveling and accommodation expenses. But if you have a spare $9,000 and like to get wet, this might be the rebreather for you.

For more information regarding the best rebreather in the market, click the link below:



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