Thermistor 79005 High-Limit & 79006 Control Sensor Kit - Spa Heater

In this review the Thermistor 79005 high-limit and 79006 control sensor kit is evaluated for spa owners who need a reliable replacement for Watkins No Fault and PDR heaters. The bottom line: this kit is best for technicians and DIYers who want a direct, updated replacement that restores proper temperature sensing and safety shutdowns. The review focuses on fitment, function and installation so you can decide whether the Camoo kit meets your spa maintenance needs.

Key Features

• Perfect fitment: The kit is designed to fit No Fault Heater and PDR Heater housings and is compatible with Hot Spring, Limelight and Tiger River models from 2002 to 2023, simplifying part selection.
• Upgrade design: Newly designed thermistors include O-rings and an updated part number (34-01395-K) to replace obsolete parts and improve sealing at the heater port.
• Dual-function sensors: The 2-pin high-limit sensor shuts down the heater if outlet water exceeds 118 degrees F while the 4-pin control thermistor reports water temperature to the motherboard for accurate regulation.
• Direct replacement: The sensors screw into the Watkins No Fault Heater housing and plug into the IQ 2020 control box motherboard, making the swap straightforward for anyone comfortable with basic spa service.
• Safety emphasis: Including both the high-limit and control thermistors in one kit maintains system safety and avoids mismatched parts that could bypass temperature protection.
• Warranty and returns: The item includes a 30-day return promise and a 12-month warranty, offering buyers a low-risk purchase.

Who It's For

This kit is ideal for spa owners and service technicians maintaining Hot Spring, Limelight, Tiger River and compatible models who need a direct replacement for failed thermistors or want to preempt heater shutoffs. It particularly suits anyone replacing obsolete 39204, 39205, 39525 or 39530 parts and who values a sealed O-ring design and plug-and-play connection to IQ 2020 controls.

Not recommended for owners of non-compatible heater housings or systems that do not use Watkins No Fault or PDR heater form factors; those users should confirm heater model compatibility before purchase or consult a professional for alternate sensor solutions.

Pros & Cons

Pros

• Direct fit for a wide range of Hot Spring and Tiger River models, reducing installation guesswork.
• Includes both high-limit and control thermistors so temperature sensing and safety are restored together.
• O-ring upgrade improves sealing where the sensor threads into the heater housing.

Cons

• Limited to compatible heater housings and IQ 2020 control connections, so it will not work on unrelated systems.

Specifications

Our Verdict

The Thermistor 79005/79006 kit is a practical, cost-effective solution for anyone needing an exact replacement for Watkins No Fault and PDR heater thermistors. It restores both temperature measurement and high-limit safety with an improved O-ring design, and its direct plug-in compatibility with IQ 2020 controls makes installation straightforward. For compatible Hot Spring and Tiger River owners this kit is a sensible maintenance purchase that delivers good value.

Frequently Asked Questions

Do these sensors fit my Hot Spring spa?
They fit Hot Spring, Limelight and Tiger River models listed from 2002 to 2023 and replace the obsolete part numbers named, but always confirm your heater is a Watkins No Fault or PDR style before buying.

Can I install them without tools?
The sensors screw in by hand (hand tight only) to the heater housing and plug into the IQ 2020 motherboard, so basic mechanical ability is sufficient; take care to replace both sensors together.

What does the high-limit sensor do?
The 2-pin high-limit thermistor signals the system to shut down the heater if the outlet water temperature exceeds 118 degrees F to protect the spa and equipment.