The description says it is environmentally sealed - DOES it mean it is suitable for cold water diving?
I have dove mine in the Pacific Northwest without any problem.
I live in Maine and dive during the winter in the ocean and have never had a problem with it. It's a great regulator.
I have been on several cold water dives with mine. It works great.
I have used it in water as cold about 52. Not sure if that's what it means but it seems to work fine for me :)
I believe they are referring to the regulator being completely sealed up to prevent debris or water from entering and causing problems. However, I used this regulator in around 35-40? water at depth and had no problems.
Your answer should be within the specifications or description of the product. I purchased this regulator as a back up to my main equipment because I've had trouble with my main regulator in the past. I wouldn't have cared if it was for cold water.
Unfortunately, it is not a cold-water diving regulator. But it can be! An Aeris certified service center can remedy that problem by ordering and installing a cold water kit for about $30 plus labor. I made the mistake by not properly researching the AT400 before diving in the 41 degree Lake Superior in June. 5 minutes is all it took to start free-flowing. The DVT designation refers a feature on the yoke of the 1st stage that keeps and water and or debris while not in use. I didn't chose install the cold water kit, but chose to purchase a Hollis setup. I will still continue to use the Aeris as a backup as well as on any warm-water dive trips because it is still a great regulator. My opinion, give the cold water kit a try, it's still cheaper than other regulators out there. Hope it helps!
Enviro seal means that it is equipped with DVT or Dry Valve Technology. When you remove a standard 1st stage from the tank there is a possibility that water or contaminants can enter the unit. The DVT is a piston valve on the 1st stage that automatically opens when attached to the tank and immediately closes upon removal from the tank - keeping the internal valve mechanisms clean and dry. I now exclusively dive with an Oceanic EOS which is cold water certified, so you will have to check with Aeris directly to be sure if the AT 400 sport is ok for cold water use.
Audrey, my answer is that I believe the regulator is, in fact, rated for cold water diving. That is one of the primary reasons why I purchased it. Not only is is not supposed to freeze up, but it's also easier to breathe at deep depths in cold water. Saying that, I think that you should check out Aeris's website that gives the technical specs and design features of the unit. My 14 year old and I dove off Puerto Rico and Long Island, NY as well as a very cold quarry in PA. Naturally, the warm water presented no problems at all and I can tell you that I was very pleased with the breathing performance in the quarry. Hope that helps.