What is the annual cost rebreather

[mr_v]

Never ask such questions like how much a rebreather costs - my wife might accidentally see the posts

The OP could be someone's wife looking for answers ;-)

 

[ofg-1]

"If you have to ask the price, you can't afford it." J P Morgan

 

[TimBloemeke]

I think annual cost is hard to specify – the only fixed expenses are sensors and factory service (for units that require it). Depreciation is another factor you might want to consider.

Here's a piece I wrote for Alert Diver (EU), outlining a possible approach to calculating cost per dive. CCR vs. Open Circuit: What's the cost per dive? - Alert Diver Magazine | DAN Europe

tl;dr: YMMV