A moisture pump (20, 200, 400) apparatus, comprising: a housing (25, 225, 425) defining a heating chamber (30, 230, 430) and a condensation chamber (35, 235, 435), the housing (25, 225, 425) having an adsorption port (40, 440) into the heating chamber (30, 230, 430), a desorption port (45, 445) between the heating chamber (30, 230, 430) and the condensation chamber (35, 235, 435), and a venting port (50, 250, 450) out of the condensation chamber (35, 235, 435); a desiccant (26, 426) positioned in the heating chamber (30, 230, 430); a heater (27, 227, 427) maintained in the heating chamber (30, 230, 430) and configured to heat the heating chamber (30, 230, 430); and a valve assembly (29, 229, 429) maintained by the housing (25, 225, 425) and transitionable between: an adsorption position (140, 540) in which the valve assembly (29, 229, 429) seals the desorption port (45, 445) between the heating chamber (30, 230, 430) and the condensation chamber (35, 235, 435) and opens the adsorption port (40, 440) into the heating chamber (30, 230, 430) for water vapor transmission into the heating chamber (30, 230, 430), and a desorption position (145, 545) in which the valve assembly (29, 229, 429) seals the adsorption port (40, 440) and opens the desorption port (45, 445) between the heating chamber (30, 230, 430) and the condensation chamber (35, 235, 435) for water vapor transmission out of the heating chamber (30, 230, 430), characterized in that in the desorption position (145, 545) and the adsorption position (140, 540), the heater (27, 227, 427) remains in a fixed position relative to the housing (25, 225, 425) outside of the condensation chamber (35, 235, 435) of the housing (25, 225, 425). a housing (25, 225, 425) defining a heating chamber (30, 230, 430) and a condensation chamber (35, 235, 435), the housing (25, 225, 425) having an adsorption port (40, 440) into the heating chamber (30, 230, 430), a desorption port (45, 445) between the heating chamber (30, 230, 430) and the condensation chamber (35, 235, 435), and a venting port (50, 250, 450) out of the condensation chamber (35, 235, 435); a desiccant (26, 426) positioned in the heating chamber (30, 230, 430); a heater (27, 227, 427) maintained in the heating chamber (30, 230, 430) and configured to heat the heating chamber (30, 230, 430); and a valve assembly (29, 229, 429) maintained by the housing (25, 225, 425) and transitionable between: an adsorption position (140, 540) in which the valve assembly (29, 229, 429) seals the desorption port (45, 445) between the heating chamber (30, 230, 430) and the condensation chamber (35, 235, 435) and opens the adsorption port (40, 440) into the heating chamber (30, 230, 430) for water vapor transmission into the heating chamber (30, 230, 430), and a desorption position (145, 545) in which the valve assembly (29, 229, 429) seals the adsorption port (40, 440) and opens the desorption port (45, 445) between the heating chamber (30, 230, 430) and the condensation chamber (35, 235, 435) for water vapor transmission out of the heating chamber (30, 230, 430), characterized in that in the desorption position (145, 545) and the adsorption position (140, 540), the heater (27, 227, 427) remains in a fixed position relative to the housing (25, 225, 425) outside of the condensation chamber (35, 235, 435) of the housing (25, 225, 425). an adsorption position (140, 540) in which the valve assembly (29, 229, 429) seals the desorption port (45, 445) between the heating chamber (30, 230, 430) and the condensation chamber (35, 235, 435) and opens the adsorption port (40, 440) into the heating chamber (30, 230, 430) for water vapor transmission into the heating chamber (30, 230, 430), and a desorption position (145, 545) in which the valve assembly (29, 229, 429) seals the adsorption port (40, 440) and opens the desorption port (45, 445) between the heating chamber (30, 230, 430) and the condensation chamber (35, 235, 435) for water vapor transmission out of the heating chamber (30, 230, 430), characterized in that in the desorption position (145, 545) and the adsorption position (140, 540), the heater (27, 227, 427) remains in a fixed position relative to the housing (25, 225, 425) outside of the condensation chamber (35, 235, 435) of the housing (25, 225, 425).