If I can throw this in, its a good idea to also have a method of brining in fresh air from the outside to make up for everything you are exaushting outside. There are 5" inline duct heaters that can heat cold air in the winter months, but if your place is like mine, the cold air can aid in cooling down the tank too.
Edit - If an exchanger is out of reach, use a min 300cfm bathroom exhaust fan. But you will need to have some form of makeup air duct according to building codes. Broan makes some nice "high flow" fans that are very quiet. Note that some juristictions require that fans above 300cfm be interlocked with your furnace, keep that in mind if you can't get a wire down to your furnace.
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"what do you mean you need another tank??"
Last edited by Gizmo; 05-04-2009 at 04:20 PM.
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