It's nothing more than a heater core in a metal box with a fan mounted on it , but it's all new and the fab-work has been done for ya... four screws and two long hoses and you got heat.
The one I had was designed to make 15,000 BTU and be no bigger than a lunch box..JC Whittney also carries a variety of these from 10'000-35'000 BTU.
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