My newest project! Almost done...

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the gray building is a outside woodstove ? never seen or heard of one ,does it work good ,how it work ?

Yup.
Easiest way to explain how it works it to check it out at www.centralboiler.com

Works excellent.
Someday I plan to heat the floor in my shop with it, but right now until I can afford to pour the concrete, I'm just hookin it up to another heating coil setup just like the house.

Heats our hot water too.

Pic from the central boiler website;