A heater system for a pressurizable and fluid-retaining vessel is disclosed. The heater system includes a frame assembly, a heater element, a temperature controller, and an insulation member. The frame assembly includes a first portion, which is structured and arranged to at least partially overlay the pressurizable and fluid-retaining vessel. The frame assembly includes a second portion, which is structured and arranged to mountably couple to the machine. The heater element is adapted to heat the pressurizable and fluid-retaining vessel. The heater element is supported within the first portion of the frame assembly. The temperature controller is adapted to regulate temperature of the pressurizable and fluid-retaining vessel. The insulation member encloses the pressurizable and fluid-retaining vessel and the heater element.