[les korcala]

Russ,
Let me try to clarify and correct. I was improperly calling the coolant tank everything inside the stainless steel coolant box. I should have said around and not through the coolant tank that is inside the stainless steel box. Quoting Roger, "The hot water is heated by sending the water through a continuous copper loop that is wrapped around the outside of the hot boiler tank, then through mixing valve (anti-scald device) to send constant 120 degree water to the inside of the coach."

Hope this clarifies....................

I had chance to see the photo of the opened tank ( A Hot Co.had one opened the Aqua Hot Box ) inside of teh AH Box tyere is tank is coiled with two sets of copper tubes ( in my case we have two elements 1700 & 4000 watts ) and each cooper pipe was coiled around the barrel shape tank )some 180 feet of it, that is lot of great heat circulation of coolant! in our case was the 4000watts element and its pipe developed rusty like holes.