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Thermistor's

Electronic Temperature Sensors

control box thermistorsA thermistor is a semiconductor that changes resistance with temperature changes (as the temperature goes up, the resistance goes down). Typical dependable life span of this device is 6-8 years. The Hot Spring & Tiger River thermistors screw into the heater and then connect to the control box.

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Thermistor, Control Thermostat, Hot Spot & Solana Item #: 71578

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This is the replacement thermistor for the 1999-2002 Hot Spot RE, RLX, SE, SLX and the 2001-2002 SLXtra (wood sided) spa models. Also the Solana 2000-2002 X, 2003-2005 RX, SX and TX models. This thermistor communicates the actual water temperature to the controller to shut off the heater when the spa reaches target temperature. Click the "More Info" button for details.
List Price: $33.40
Price: $28.39

Thermistor, Control Thermostat, Hot Spring & Tiger River 1995-2002 Item #: 38415

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This control thermostat thermistor sensor detects the spa waters temperature and relays that information back to the system. It simply screws into the No Fault Heater Housing (hand tight only) and plugs into the side of the spa's control box. (If your existing thermistor plugs directly onto the IQ2020 control box motherboard see item 39525). Always replace thermistors in pairs. Click the "More Info" button for details.
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List Price: $19.20
Price: $16.32

Thermistor, Control Thermostat, Hot Spring & Tiger River, 2002-current Item #: 39530

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This control thermostat thermistor sensor detects the spa waters temperature and relays that information back to the system. It simply screws into the No Fault Heater Housing (hand tight only) and then plugs directly onto the IQ 2020 control box motherboard. (If your existing thermistor plugs into the side of the spa's control box see item 38416). Always replace thermistors in pairs. Click the "More Info" button for details.
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List Price: $19.20
Price: $16.32

Thermistor, Control Thermostat, Hot Spring '94 & Hot Spot '95-'98 Item #: 38564

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This is the replacement thermistor for all 1994 Hot Spring spa models and 1995-1998 Hot Spot RE, RLX, SE & SLX spa models.

This Control Thermostat Thermistor communicates the actual water temperature to the controller to shut off the heater when the spa reaches target temperature. It is used on all 2006-current Hot Spot Mallorca, Sorrento, Trinidad & Tobago spa models. It is also used on all 2006-current Solana RX, SX & TX spa models.
List Price: $19.80
Price: $16.83

Thermistor, Control Thermostat, Solana & Hot Spot-2006-Curr Item #: 72493

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This Control Thermostat Thermistor communicates the actual water temperature to the controller to shut off the heater when the spa reaches target temperature. It is used on all 2006-current Hot Spot spa models. It is also used on all 2006-current Solana RX, SX & TX spa models.

List Price: $22.00
Price: $18.70

Thermistor, Hi-Limit, Oasis Item #: 72492

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The hi-limit thermistor (aka thermister) is a safety device to shut down power to the heater in a "low water flow" or no water flow" condition. It is used on the Caldera Oasis.
Price: $20.66

Thermistor, High Limit, Solana & Hot Spot, 2006-current Item #: 73992

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This High Limit Thermistor is a safety device that will shut down the heater if the water temperature exiting the heater is too hot. This would indicate a "low water flow" condition. It is used on all 2006-current Hot Spot Mallorca, Sorrento, Trinidad & Tobago spa models. It is also used on all 2006-current Solana RX, SX & TX spa models.
List Price: $18.90
Price: $16.07

Thermistor, High-Limit, Hot Spring & Tiger River, 1995-2002 Item #: 38416

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The high-limit thermistor sensor is a safety device designed to communicate with the system to shut down the heater if the water temperature exiting your heater exceeds 118 degrees F. It simply screws into the No Fault Heater Housing (hand tight only) and then plugs into the side of the spa's control box. (If your existing thermistor plugs directly onto the IQ2020 control box motherboard see item 39530).  Always replace thermistors in pairs. Click the "More Info" button for details.
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List Price: $19.20
Price: $16.32

Thermistor, High-Limit, Hot Spring & Tiger River, 2002-current Item #: 39525

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The high-limit thermistor sensor is a safety device designed to communicate with the system to shut down the heater if the water temperature exiting your heater exceeds 118 degrees F. It simply screws into the No Fault Heater Housing (hand tight only) and then plugs directly onto the IQ 2020 control box motherboard. (If your existing thermistor plugs into the side of the spa's control box see item 38415). Always replace thermistors in pairs. Click the "More Info" button for details.
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List Price: $19.20
Price: $16.32