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[Gene GeRue <genegerue AT ruralize.com>]

> The ammonia refrigerant is a sealed system, so you aren't dealing 
> corrosives in the hot water aspect.

So, is what you are suggesting using hot water as the heat source to heat 
the ammonia into becoming a gas? If so, how would one control the temp of 
the walk-in box? Hm, maybe using a valve on the water line like in a 
radiant heat system.

I think I get the idea, but how would one cool a walk-in box with a 
refrigerator? Leave the door open?