from £4039
This is the development of the original design. It has no sophisticated electronics to handle decompression, it may look a little over-simple when compared with other units
today, and the manufacturer tells us that few people want them any more, but it is still available if you do.
With classic over-the-shoulder twin counter-lungs for a low WOB and dual master and slave controllers, the Classic has an axial scrubber normally good for three hours, and 3-litre cylinders. It is the basis for all other APD rebreather designs.

from £4795
The Vision electronic control revolutionised the Inspiration when it was introduced, and this unit has done more to popularise rebreather diving than any other. The handset with piezo button controls works with a HUD to make it a joy to use. The Vision has dual-power supplies, audible warnings and auto set-point switching. Its scrubber has a three-hour duration under normal conditions and includes an optional temperature stick, intended to give an overview of how it is functioning at any time. Other options include an ADV, a BOV and a CO2 sensor. Decompression software is available from nitrox (40m) to trimix (100m). With tanks it weighs 29kg.

from £4795
This smaller rebreather was designed with the long-distance travelling diver in mind.
It’s a mini-version of the Inspiration Vision, in that it has a two-hour scrubber and is mated to 2-litre cylinders, but it retains its bigger brother’s dual oxygen control system.
The Evolution is intended for warm-water wildlife photographers and it weighs in (with tanks) at only 24kg. It makes available all the options otherwise intended for the Inspiration Vision. Decompression software is available from nitrox (40m) to trimix (100m). www.apdiving.com

from £4795
While many users liked the idea of smaller cylinders, the scrubber duration was called into question by some, so the Plus version was introduced with the bigger three-hour scrubber canister (2.5kg) of the Inspiration to fit conveniently in the middle of the APD product range. www.apdiving.com

from £10,429
Probably the most complex and possibly the most capable CCR available to the leisure
diving public, this unit distinguishes itself by employing a radial scrubber for at least five hours of ordinary use, and stainless-steel pipework.
With its back-mounted counter-lungs and a Kevlar case, the cost-no-object Ouroboros is supplied to meet the individual requirements of each diver.
It has, however, largely been superceded by its Sentinel stablemate.

from £6547
Using a complex engineering and electronic solution to design out diver errors, the Sentinel is the heavyweight in this company at 32kg without cylinders. Its HUD can convey a lot of information using different-coloured LEDs, which is duplicated rearwards on the unit for the benefit of a buddy.
The Sentinel has a single back-mounted counter-lung hidden within its box with the rest of the major elements of the unit, and is said to be able to withstand a severe flood by draining through a bottom-mounted over-pressure valve on the 2.2kg axial scrubber unit.
Scrubber duration is more than three hours under leisure-diving conditions.
BOV and ADV are standard, and the computer handles decompression as well as oxygen management. It can be mated to 2- or 3-litre gas cylinders. One option is an optical digital data transmission system (Optocon) that avoids problems associated with cables and water.
A CO2 sensor is available on the Expedition version, and there is a slightly lighter Travel Frame version. Power comes from a rechargeable lithium battery.

£5216 (with cylinders)
Intended to take the complications out of rebreather diving by being very complicated
in its own design, this unit has three mini-processors that take care of everything. Two sensors are continuously recalibrated using micro-valves that blow air and oxygen alternately over them.
The Discovery carries out its own pre-dive checks electronically, and even the scrubber uses pre-packed cartridges of Sofnolime.
The wrist-mounted computer takes care of nitrox diving limitations, and all the diver has to do is follow the recommended decompression requirements and, should a red light appear at the HUD, switch the mouthpiece from closed-circuit to open-circuit and head for the surface. Even this mouthpiece is very clever, because it adjusts decompression to suit.
The Discovery is really intended to be used only to a maximum of 30m, or to 40m with an optional off-board OC bail-out tank.
It weighs only 18kg ready to dive, and was the original concept behind the PADI recreational rebreather programme.

price tba
This US-made rebreather has been around for some time and firmly established itself with the cognoscenti, but only recently has it been awarded CE-certification and therefore legal sales opportunities within Europe.
It has over-the-shoulder counter-lungs with good flood recovery, and is available with a variety of axial and radial scrubber canisters to suit different duration requirements. Twin handsets (Shearwater or Liquivision) cover decompression requirements as well as oxygen management, and there is an optional HUD, together with an ADV and BOV.
The Megalodon weighs around 35kg with tanks.

from £6443
Made in Belgium, and comprising a range of manually operated CCRs that each
has CE-certification and a compact shape, the Hybrid has partial electronic oxygen-management according to the depth at which it is used.
A choice of radial or axial (4kg) scrubbers and long scrubber duration, compact stainless-steel construction for negative buoyancy and a wide choice of pO2 monitors, HUDs, computers and controllers makes it hard to categorise easily here.