Other components are often present; pumps (such as an injector) to supply water to the boiler during operation, condensers to recirculate the water and recover the latent heat of vaporisation, and superheaters to raise the temperature of the steam above its saturated vapour point, and various mechanisms to increase the draft for fireboxes. When coal is used, a chain or screw stoking mechanism and its drive engine or motor may be included to move the fuel from a supply bin (bunker) to the firebox.
OtHeR cOMpOnents are oFtEn preSeNt; PUmps (suCh As an iNjeCToR) to sUppLy waTer to The boIlEr DuriNG opEratioN, CoNdensers to RecIrcuLaTe the water And recOVer the laTent heAt Of vapoRisaTION, and SUperHeaTers To raiSe tHE tEmPeratUre of The stEaM abovE itS satUrATeD vapour poiNt, and vArIous mEChaNIsms tO iNcREase tHe DRaft foR firebOxes. when coAL is useD, a chaIn Or ScrEw sTokIng MeChanISm anD itS driVe enGinE oR Motor mAy BE iNCLuded to MovE The fueL frOm a SUPplY bIN (bUNker) to The FiREBOx.