1859 Trans. Illinois State Agric. Soc. 1857–83 522 My boiling was not conducted under as favorable auspices..as in the experiment previously alluded to with the flue boiler.
1874 E. H. KnightPract. Dict. Mech. I. 891/1Flue-boiler, a steam-boiler whose water space is traversed by flues.