Wood burning heating unit

Claim 1

A wood burning heating unit comprising (a) walls defining a combustion chamber and having wall cavities therein for heating a liquid, (b) a floor beneath said combustion chamber and having a floor cavity therein for heating a liquid, (c) baffle means separating a portion of said floor cavity into separate floor passageways, said floor passageways having a direction from the front of said floor adjacent the fireplace opening towards said rear wall, (d) baffle means separating a portion of said wall cavities into separate substantially vertical wall passageways, and (e) a heat absorption unit formed of spaced tubes positioned above the combustion chamber, said tubes connected in groups by cavities in header units at each end to provide a continuous path from a top portion of said wall to an exit from said heating unit whereby said liquid flow path to progressively heat said liquid includes (i) inlet flow generally into the front of said floor cavity, (ii) then flow from the front of said floor cavity rearward through said floor passageways, (iii) then flow vertically up the walls through said wall passageways, (iv) then flow around the periphery of the top of said wall cavities into said heat absorption unit inlet, (v) then flow through said path formed by said groups of tubes and header units cavities thereby multiply reversing the flow direction across said heat absorption unit, and (vi) then flow from said heat absorption unit generally into an outlet standpipe to exit said heating unit.