Bring clothes to keep you warm when wet, like a water-repellent jacket, says Laurence Gonzales, author of Deep Survival: Who Lives, Who Dies, and Why.

Distribution of water flow is an important factor that affects the double water jacket boiler.

For dirty water or sanitary sewage applications, clogging of the cooling jacket passages can easily occur due to a build-up of solids, grease, corrosion and other matter.