Abstract: An icemaker having a thermally conductive tube with a coolant inlet and outlet and at least one substantially flat ice-forming elongated surface. An elongated thermally non-conducting strip of material on each long side edge of the tube with an outer surface continuous with the ice-forming surface and a plurality of spacers, each extending across the elongated surface at spaced apart intervals with a means for releasably holding the spacers against the elongated surface, also including a means for passing a curtain of water over said elongated surface.