HLT combined brewhouse are " American style brewhouse" attached with a same sized HLT at bottom of the Mash/Lauter tun. The HLT could be a seperate heating vessel to supply brewing water or sparging water, also a good place to storage the first time wort The best thing for a brewhouse like that is it would save your sq ft on floor plan for sure. On the other hand, for brewers who prefer gas fired heating method, HLT combined brewhouse require two heating chamber attached with