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Electrical Questions and Answers to Troubleshoot and Repair Electric Wiring Problems

Hot Tub Pump and Heater Control

By Dave Rongey - Summary:

Electrical Circuit Control for a Hot Tub Heater and Pump – Install a relay that would be activated when the pump is turned on by the Intermatic Time Clock. The HydroQuip electric heater circuit would be connected through the set of contacts of the relay.

How To Control The Heater and the Pump

Electrical Question: Can I interconnect the heater and the pump with a switch or relay to ensure that the heater fires only when the pump is in the low-speed “on” cycle?

Thank you!

This electrical wiring question came from: John, a Handyman from Ridgefield, Connecticut.

Additional Comments: Excellent; Very Informative.

Dave’s Reply:
Thanks for your electrical wiring question John.

Electrical Circuit Control for a Hot Tub Heater and Pump


Application: Hot Tub Heater and Pump.
Skill Level: Intermediate to Advanced – Best performed by a Licensed Electrician.
Tools Required: Basic Electricians Pouch Hand Tools and Voltage Tester.
Estimated Time: Depends on personal level experience and ability to work with tools.
Precaution: Identify the hot tub circuit, turn it OFF and  Tag it with a Note before working with the wiring.

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2 Responses to “Hot Tub Pump and Heater Control”
  1. Dave Rongey says:

    Hi Karen,
    From what you have described I would suspect that the temperature control may need to be replaced. Even if the hot tub is in good condition, the temperature control is one of the parts that is turning on and off quite often and may over time become faulty and need replacement.
    I hope this helps,

  2. karen rose says:

    I have a 1985 Hot Springs Spa indoor/outdoor hot tub. It has been fluctuating temperatures. It will be set for around 90 degrees and all on it’s own will spike up to way over 100 degrees. I will turn the temperature control knob all the way to the left (off) and that doesn’t seem to help. We have owned the tub as original owners and it is in VERY good condition. I am looking for a manual for it or at least the component/wiring diagrams. Any suggestions will be greatly appreciated.