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A fluid heating system includes a tank assembly having an interior surface bounding a chamber, the tank assembly including a sidewall and a lid. A collapsible bag is removably disposed within the chamber of the tank assembly, the collapsible bag bounding a compartment adapted to hold a fluid. A boil

A fluid heating system includes a tank assembly having an interior surface bounding a chamber, the tank assembly including a sidewall and a lid. A collapsible bag is removably disposed within the chamber of the tank assembly, the collapsible bag bounding a compartment adapted to hold a fluid. A boiler can be used for pumping heated fluid through the wall of the tank assembly for heating the fluid within the collapsible bag. An impeller is disposed within the compartment of the collapsible bag. An elongated drive shaft is removably coupled with the impeller such that rotation of the drive shaft facilitates rotation of the impeller within the compartment of the collapsible bag. A drive motor assembly is coupled with the drive shaft, the drive motor assembly being adapted to rotate the drive shaft when the lid is in an open or closed position.

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1. A fluid heating system comprising: a tank assembly having an interior surface bounding a chamber, the tank assembly comprising: a sidewall encircling the chamber and extending between a first end and an opposing second end, the first end bounding an opening to the chamber;a lid movable between a

1. A fluid heating system comprising: a tank assembly having an interior surface bounding a chamber, the tank assembly comprising: a sidewall encircling the chamber and extending between a first end and an opposing second end, the first end bounding an opening to the chamber;a lid movable between a first position wherein the opening to the chamber is exposed and a second position wherein the lid is disposed over the opening; anda floor disposed at the second end of the sidewall;a collapsible bag removably disposed within the chamber of the tank assembly, the collapsible bag bounding a compartment adapted to hold a fluid;means for controlling the temperature of the fluid within the collapsible bag when the collapsible bag is positioned within chamber of the tank assembly;an impeller disposed within the compartment of the collapsible bag;an elongated drive shaft removably coupled with the impeller such that rotation of the drive shaft facilitates rotation of the impeller within the compartment of the collapsible bag; anda drive motor assembly coupled with the drive shaft, the drive motor assembly being adapted to rotate the drive shaft when the lid is in the first position or the second position. 2. The fluid heating system as recited in claim 1, further comprising an opening extending through the sidewall of the tank assembly, the drive motor assembly being disposed within the opening so as to communicate with the chamber of the tank assembly. 3. The fluid heating system as recited in claim 1, further comprising a rotational assembly mounted to the collapsible bag, the rotational assembly comprising: a casing secured to the collapsible bag; anda hub rotatably mounted to the casing, the hub having a passageway extending therethrough, the drive shaft extending through the passageway of the hub. 4. The fluid heating system as recited in claim 3, further comprising an elongated tubular connector having a first end and an opposing second end, the first end of the connector being connected to the hub and the second end of the connector being secured to the impeller, the drive shaft being disposed within the tubular connector. 5. The fluid heating system as recited in claim 1, wherein the means for controlling the temperature of the fluid comprise a fluid channel disposed within the lid and the sidewall of the tank assembly. 6. The fluid heating system as recited in claim 5, further comprising: a boiler for heating fluid; anda pump for pumping the heated fluid from the boiler through the fluid channel within the lid and sidewall of the tank assembly. 7. The fluid heating system as recited in claim 1, further comprising: a temperature port assembly coupled to the collapsible bag, the temperature port assembly bounding a cavity that projects into the compartment of the collapsible bag but is not in fluid communication with the compartment; anda temperature probe positioned with the cavity of the temperature port assembly. 8. The fluid heating system as recited in claim 7, further comprising a support extending between the tank assembly and the temperature port assembly, the support supporting the temperature port assembly within the chamber of the tank assembly at a distance from the sidewall. 9. A fluid heating system comprising: a tank assembly having an interior surface bounding a chamber, the tank assembly comprising: a sidewall encircling the chamber and extending between a first end and an opposing second end, the first end bounding an opening to the chamber;a lid movable between a first position wherein the opening to the chamber is exposed and a second position wherein the lid is disposed over the opening; anda floor disposed at the second end of the sidewall;a collapsible bag removably disposed within the chamber of the tank assembly, the collapsible bag bounding a compartment adapted to hold a fluid;a temperature port assembly coupled to the collapsible bag, the temperature port assembly bounding a cavity that projects into the compartment of the collapsible bag but is not in fluid communication with the compartment;a temperature probe positioned with the cavity of the temperature port assembly; anda support extending between the tank assembly and the temperature port assembly, the support supporting the temperature port assembly within the chamber of the tank assembly at a distance from the sidewall. 10. The fluid heating system as recited in claim 9, further comprising means for controlling the temperature of the fluid within the collapsible bag when the collapsible bag is positioned within chamber of the tank assembly. 11. The fluid heating system as recited in claim 10, wherein the means for controlling the temperature of the fluid comprises: a fluid channel disposed within the lid and the sidewall of the tank assembly;a boiler for heating fluid; anda pump for pumping the heated fluid from the boiler through the fluid channel within the lid and sidewall of the tank assembly. 12. The fluid heating system as recited in claim 9, further comprising means for mixing the fluid within the collapsible bag when the collapsible bag is disposed within the chamber of the tank assembly. 13. The fluid heating system as recited in claim 9, wherein the temperature port assembly comprises: a port secured to the flexible bag; anda probe adapter secured to the port, the probe adapter comprising: a tubular sleeve received over the port;a mounting flange radially outwardly projecting from the sleeve; anda receiver coupled to the sleeve and projecting down through the sleeve, the receiver bounding the cavity of the temperature port assembly. 14. The fluid heating system as recited in claim 13, wherein the support comprises: a flange mounted to the sidewall of the tank assembly and projecting into the chamber; anda retainer disposed at an end of the flange, the probe adapter being supported on the retainer. 15. The fluid heating system as recited in claim 14, further comprising a clamp removably securing the probe adapter to the retainer.