The Precision Model FPH vertical firetube hot water boiler features the traditional firetube design in the vertical configuration with an underfired power burner. In additon to the simplicity of the 4-piece design, the Model FPH includes many advantages over other vertical configured boilers such as a larger water volume which results in both a low pressure drop thru the unit and reduced cycling, thus improving overall efficiency. The model FPH also features standard "off-the-shelf" burners and the proven firetube reliability.