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Generators and Power Quality

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Generator Question: I was wondering if a generator could be hooked up to a hot tub for emergency heating only.
The hot tub requires a 50 amp breaker and pulls about 4500 watts with everything running.
What size of portable generator would be required and any special wiring needed?

This electrical question came from: Joe, a Homeowner from Iowa city , IA

Dave’s Reply:
Thanks for your electrical question Joe.

Generators for Home Electrical Power

A few things to consider for this hot tub generator application:

How to Select the Right Generator for your Home Electrical Requirements


The Importance of a Generator Transfer Switch

Hot Tub Wiring

Home Generators
Home Generators
This series covers a wide variety of topics all about home generators including sizing, selecting, connecting and safely operating this all important addition to your home.

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Hot Tub Wiring Diagram Information
Electrical Codes and Details for Spa and Hot Tub Wiring. Essentials for your installation, including the required GFCI ground fault protection and circuit wire size.

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  1. Sue says:

    I live in the northeast and as you can imagine, have plenty of snow storm and blizzards. I have a hot tub which requires 240V, 50amp. I have a generator that can handle 7000 running watts and 9000 start up watts. My electrical box has a switch, so that if I loose power, I hit the switch in my breaker box, connect the generator and off I go. We have lost power before for over a week, and I am afraid of my hot tub freezing. I do use it all winter so draining is not an option. If I were to alternate my house (furnace, minimal lights, etc…) and every few hours switch to only the hot tub. Would my generator handle it?

    • Dave Rongey says:

      Hi Sue,
      The generator would bog down to the electrical demand of the heater which is in the hot tub. You may want to consider having a freeze stat installed on the hot tub. A freeze stat is typically set up to turn on the pump at a low temperature before freezing which will then circulate the water to help prevent freezing. A local hot tub installer or technician should be able to set you up with this.
      I hope this helps,


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