[Jon]

I used to have one of those electrical heating pads for one of my drysuits and it was a waste- at least the one I owned. It was made by a company called Rpetative Diver and was the biggest waste of $400 in my life. It had a battery pack that could be mounted inbetween a set of doubles and a thermostat switch that you wore on your waist. I found the heating pad to be too small to keep my whole body warm.

This was 10 years ago and they may have come a long way since then, but I found that investing in a better set of underwear, like C4 or Weezel wear, and adding some argon into the mix was a better use of my money.

I know some rebreather divers who have them in their suits, for multiple hour deco stops, but am not sure which model they went with.

Jon