understanding aqua-hot??

[Steve Ownby]

Originally Posted by Dr4Film

Jimmy F,

I am not an expert like Roger Berke however, for the life of me I am having difficulty understanding how the domestic hot water will get HOT if it is on the outside of the boiler and not inside.

Please explain.

To my knowledge, the boiler coolant mixture is heated by the Webasto burner and the electric heating element which then transfers the heat to the domestic hot water loop which wanders inside the boiler coolant mixture.

Dr4Film ----- Richard

In around '04-'05 AquaHot changed the design and put the hot water loop inside the tank in direct contact with the coolant mixture. Up until that design change, the hot water loop wrapped around the outside of the tank. The copper water loop is in direct contact with the steel boiler vessel and the heat transfer is plenty good. This was the design up through the 100-02s which is the version I have. When the loop went inside the boiler AquaHot started requiring non toxic fluid. Before that time standard green ethylene glycol was used in a 50/50 solution.

[Jimmy F]

Originally Posted by Steve Ownby

In around '04-'05 AquaHot changed the design and put the hot water loop inside the tank in direct contact with the coolant mixture. Up until that design change, the hot water loop wrapped around the outside of the tank. The copper water loop is in direct contact with the steel boiler vessel and the heat transfer is plenty good. This was the design up through the 100-02s which is the version I have. When the loop went inside the boiler AquaHot started requiring non toxic fluid. Before that time standard green ethylene glycol was used in a 50/50 solution.

Thanks Steve.... Here is a picture of the older Aqua Hot domestic water coil tightly wrapped around the boiler.

Jimmy F

[Dr4Film]

Thanks guys for the explanation and the photo. That photo really helps out.

Now I understand where the domestic water leak had come from on my original Aqua-Hot unit in my 2002 Windsor, actually built in 2001.

I had to have a rebuilt unit installed in 2005/06 which came from the factory in Colorado. I am sure that the rebuilt one I have now has an internal domestic water loop and hence why I use the Sierra propylene glycol mixture.

Dr4Film ----- Richard