Oh and one other thing, the cooling fins on the radiator are required because you are exchanging with air which has a low capacity for absorbing heat compared to water. I just filled my steel tanks in 30 minutes which is much faster than usual and the tanks measure 120 degrees f. In water a 40 degree delta with the amount of surface area as the tank has will transfer a significant amount of heat rather quickly. Those galvy tanks I use also have a low emisivity so their ability to radiate heat is pretty slow. Sinking it into water by conduction and convection is many times faster but of course it slows as the tank temperature gets closer to ambient. The galvy tanks only showed 85 degrees with my infrared temperature gauge. I had to put black tape on the tank to get a truer reading. That tells me that they suffer from slow cooling in air alone. White would be even worse.
On a light note, great dive today. My sweetie is really starting to look like a pro.
On a light note, great dive today. My sweetie is really starting to look like a pro.
