NEDU cold water regulator performance testing data......most recent I came across...Poseidon Xstream came out on top http://www.dtic.mil/dtic/tr/fulltext/u2/a549745.pdf
Best Regs for Extreme Cold
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halocline
Contributor
I certainly wouldn't buy the MK25- evo or no evo, specifically for freezing cold water use. If you had one and were going diving in those temps, it would probably work fine, but if you're going to buy something, make it a fully sealed diaphragm 1st stage and a metal 2nd stage for maximum heat transfer. I might go for a MK17 and a used balanced/adjustable. There are plenty of those around and easy to rebuild.
The doublehose would be a great choice because both stages are essentially sealed, as Luis pointed out. Basically, all the depressurization of air (which generates the freezing) takes place in the can, sealed off from water and moist exhaled air. But diving with a doublehose is a different experience. If you want to go that route, you might really enjoy it, but there is a learning curve and it does change other things in your set up.
The doublehose would be a great choice because both stages are essentially sealed, as Luis pointed out. Basically, all the depressurization of air (which generates the freezing) takes place in the can, sealed off from water and moist exhaled air. But diving with a doublehose is a different experience. If you want to go that route, you might really enjoy it, but there is a learning curve and it does change other things in your set up.
I have done Ice diving with poseidon triton and with apeks atx200. Neither of them has ever freeflown or had any problems. Apeks is really great reg and same reg has served me faithfully 14 years (about 220 dives)
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