Heated vests - Do they actually work ?

[passeparici]

As I don't know your dive profiles, I'll give you a general answer: Usually, you don't want to run heat all the way through the dive. When you begin a dive, you're on-gassing. Heat will help the process - exactly what you want to avoid. That's why I don't turn on the heat until the second part of the dive, when I am ready to start surfacing; unless I am really cold. Heat will then help with off-gassing, which will make deco more effective. That's for deco dives. Look up heat/decompression relationship for more detailed info.

For non-deco dives, I run heat at 20%. Sp

I am in Thailand right now. The water temperature is around 32°C. I guess I should not dive then !
I might understand you don't really want to start your dive with very warm temperature and finish with very cold one but staying warm all your dive, what's the problem ? That's what do hundred of thousend of divers in the tropic...

 

[mr_v]

I am in Thailand right now. The water temperature is around 32°C. I guess I should not dive then !
I might understand you don't really want to start your dive with very warm temperature and finish with very cold one but staying warm all your dive, what's the problem ? That's what do hundred of thousend of divers in the tropic...

The OP inquired about heated undergarments and diving in 7C degree water. My advice was in that context.

 

[Richard Dayan]

I'd rather have a heated hood.

Does such a thing exist?

No it doesn't exist.