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Balboa 58104 M7 Heater Assembly 4KW

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Balboa 58104 M7 Heater Assembly 4KW

  • 4KW - 120V / 240V
  • 15" X 2"
  • Includes Sensors
  • Split Nuts Included
  • Genuine Part
  • Balboa # 58104, 58303, G7410


The Balboa M7 Heater Assembly is developed with patented M7 technology for reliability and quality construction. It features a stainless steel housing and is front mounted for simple serviceability. Measuring 15" length with 2" x 2" unions and it uses 4.0 KW for efficient and fast operation.

One (1) Year Limited Warranty On Product


  • 4
    The heater was a perfect fit and works as new.

    Posted by Dan Bell on Aug 01, 2023

    The only problem was the heater came with a wiring harness attached to the power terminals. My application did not require the harness and I found the terminals were "locktited" on which made removal difficult and the terminals could have easily been damaged. The advertised heater assy. did not show a harness attached.

  • 5

    Posted by Steve Grace on Jul 22, 2023

    Quality customer service, ordered on Thursday, delivery on Saturday. Installed as per instructions. Spa in service same day., works like a charm. Very pleased.

  • 3
    Balboa 58104 M7 Heater Assembly 4KW

    Posted by Kevin Baillie on Dec 17, 2022

    The heater assembly came with two nuts on the studs where the power is hooked up. After installing the heater in place, I started taking the nuts off with the proper size wrench. The first nut came off no problem. Shortly after I started loosening the second nut, which was stiffer than the first, the stud broke off at the bottom where it meets the heater tube. I used very little force, and the nut did not turn very easy. The failure appeared to be as a result of the nut being partially seized on the stud from the factory, and the stud being very weak where it attached to the heater tube.

  • 5
    Fit great, works great

    Posted by Michael Irvine on Jul 02, 2022

    Fit was great, works awesome

  • 4
    Balboa 58104 M7 heater assembly 4KW

    Posted by Cécile Bos on Jun 30, 2022

    This part is working very well . Easy to install.

  • 5

    Posted by John Clarke on Apr 18, 2022

    Exact replacement that fitted quickly and works as expected.

  • 5
    Worked great

    Posted by Unknown on Nov 13, 2021

    Shipping was fast, worked great, just keep the nuts for the heater terminals as it doesn’t come with them.

  • 5
    Balboa Heater Assembly

    Posted by Kathleen Feijoo on May 18, 2021

    Part fit perfectly. Hot tub is up and running again. Love this company, they always go above and beyond!!

  • 5
    Hot Tub Heater

    Posted by Billy Mitchell on Mar 14, 2021

    I’m not sure who was texting me to help me get the right parts but they were a perfect match. Super easy way to figure out what I needed. I was even able to send pictures