A swim spa that stays warm through a cool evening starts with the heater element inside the equipment bay, not with the water itself. When that element corrodes or trips a breaker, the spa cools and the routine stops. This roundup compares the best swim spa heater options by stated wattage, voltage, material, fit and warranty, so you can match a replacement to the control system already in place.

This roundup scores 4 replacement heaters on what each listing states. Listings were collected 4 November 2026.

This article is informational and is not medical advice. Heaters in this roundup run on 120V or 240V power, and a 240V circuit should be installed by a licensed electrician. See our Medical Disclaimer.

Chillveda earns a commission when you buy through links on this page, at no extra cost to you. As an Amazon Associate I earn from qualifying purchases. Affiliate disclosure.

Quick picks

  1. 1
    Autopartsfreer 73790 hot Springs spa heater for no Chill Score 9.5/10

    A titanium replacement heater for 1995+ Hot Spring and Tiger River spas, offered in 120V and 240V versions.

    Check price on Amazon
  2. 2
    Bzsunway Replacement Part for Balboa 58117 M7 Hot Chill Score 9.5/10

    A stainless steel replacement heater for Balboa control systems, offered in 120V and 240V versions.

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  3. 3
    Hot Tub Heater Replacement M7 SPA Heating Element Chill Score 9.4/10

    A stainless steel M7 replacement heater for Balboa control systems, with temperature sensors included.

    Check price on Amazon
  4. 4
    Bzsunway Replacement for Balboa 58083 Hot Tub Chill Score 9.4/10

    A stainless steel replacement heater for Balboa control systems, with a higher wattage than the 4.0kW picks here.

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What we picked for home recovery

Autopartsfreer 73790 hot Springs spa heater for no fault heater 6KW 240V | Hot tub heater replacement ,Titanium Double-Pass for 1995+ Hot Spring & Tiger River Spas,3/4" Tubing, 1.5KW 120V / 6KW 240V

Autopartsfreer 73790 hot Springs spa heater for no

Autopartsfreer 9.5/10 Chill Score
The Chill Score runs from 9.2 to 9.8 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we review
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A titanium replacement heater for 1995+ Hot Spring and Tiger River spas, offered in 120V and 240V versions.

Pros & ConsViewHide

Pros

  • Titanium element resists corrosion, per the listing
  • 6KW at 240V and 1.5KW at 120V, the highest wattage here
  • Fits 1995+ Hot Spring and Tiger River spas
  • 1-Year Warranty stated in the listing

Cons

  • No safety certification is stated in the listing
  • Size is listed as 6KW without Pressure Switch, so check the version before ordering
  • Product dimensions of 22.63 Inches x 7.68 Inches x 5.31 Inches need checking against the equipment bay
  • Only fits the Hot Spring and Tiger River models listed, not Balboa systems
Bzsunway Replacement Part for Balboa 58117 M7 Hot Tub Spa Heater Element Assembly w/Sensors 4.0kW @ 240V / 1.0kW @ 120V Compatible with Series M7

Bzsunway Replacement Part for Balboa 58117 M7 Hot

Bzsunway 9.5/10 Chill Score
The Chill Score runs from 9.2 to 9.8 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we review
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A stainless steel replacement heater for Balboa control systems, offered in 120V and 240V versions.

Pros & ConsViewHide

Pros

  • Kilowatt rating of 4.0kW at 240V and 1.0kW at 120V
  • Stainless steel with black-coated tail pieces for corrosion resistance
  • Fits Balboa VS, EL, TS, GS, and BP Series control systems
  • 1 year warranty stated in the listing

Cons

  • No safety certification is stated in the listing
  • Manifold length of 15" and diameter of 2" need checking against the existing heater
  • Product dimensions of 17.0 Inches x 9.99 Inches x 5.0 Inches need checking against the equipment bay
  • Only a Balboa replacement, not a fit for Hot Spring spas
Hot Tub Heater Replacement M7 SPA Heating Element fits for Balboa 58117 | Water Group Parts VS, EL, TS, GS, BP Control Systems with Temp Sensor 4.0 KW 240V & 1.0kW 120V for Series M-7 Assembly

Hot Tub Heater Replacement M7 SPA Heating Element

Winsgor 9.4/10 Chill Score
The Chill Score runs from 9.2 to 9.8 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we review
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A stainless steel M7 replacement heater for Balboa control systems, with temperature sensors included.

Pros & ConsViewHide

Pros

  • 4.0 KW at 240V and 1.0kW at 120V
  • Temperature probes included, per the listing
  • Stainless steel for corrosion resistance in hot tub water
  • Fits Balboa VS, EL, TS, GS, and BP Series control systems

Cons

  • No warranty term is stated in the listing
  • No safety certification is stated in the listing
  • Product dimensions of 19.3 inches x 4.3 inches x 4.3 inches need checking against the equipment bay
  • Only a Balboa replacement, not a fit for Hot Spring spas
Bzsunway Replacement for Balboa 58083 Hot Tub Heater Element 25-175-1010 VS M7 Spa Heater Assembly, 5.5KW, 220V Suitable for Balboa BP, VS, and EL2001 Control Systems

Bzsunway Replacement for Balboa 58083 Hot Tub

Bzsunway 9.4/10 Chill Score
The Chill Score runs from 9.2 to 9.8 and weighs performance (35%), build (25%), value (25%), safety (10%, where it applies) and warranty (5%), using only what the manufacturer and the listing publish. How we review
View on Amazon.com

A stainless steel replacement heater for Balboa control systems, with a higher wattage than the 4.0kW picks here.

Pros & ConsViewHide

Pros

  • Kilowatt rating of 5.5KW
  • Stainless steel with black-coated tail pieces for corrosion resistance
  • Fits Balboa VS, EL, TS, GS, and BP Series control systems
  • Manifold length of 15" and diameter of 2", matching the other Bzsunway pick

Cons

  • Title states 220V while bullets state 240V and 120V, so voltage needs checking
  • No warranty term is stated in the listing
  • No safety certification is stated in the listing
  • Product dimensions of 18.5 inches x 3.74 inches x 3.72 Inches need checking against the equipment bay

More to compare

How to choose the best swim spa heater

Match the part number to the control system already in place: the Autopartsfreer heater fits Hot Spring and Tiger River units, while the other picks fit Balboa control systems. A heater for the wrong system is the wrong pick, however strong its wattage looks on paper.

Check voltage, manifold size and product dimensions against the existing heater before ordering, and see all hot tub reviews for related gear. For a 240V setup, a licensed electrician should install the circuit.

Watts, voltage and warranty

Heater Watts Voltage Material Warranty
Autopartsfreer Heater 6KW at 240V, 1.5KW at 120V 240V and 120V Titanium 1-Year Warranty
Bzsunway 58117 Heater 4.0kW at 240V, 1.0kW at 120V 240V and 120V Stainless steel 1 year warranty
Winsgor M7 Heater 4.0 KW at 240V, 1.0kW at 120V 240V and 120V Stainless steel Not stated
Bzsunway 58083 Heater 5.5KW 220V in title, 240V and 120V in bullets Stainless steel Not stated

Who should not buy these

If the part number does not match the control system in place, none of these picks is a fit, however close the wattage looks. If the listing states no warranty term and that matters to the buyer, the two picks with a stated warranty are the safer shortlist. If the voltage on the listing is unclear, as with the Bzsunway 58083 pick, confirm it before ordering.

Check Your Space First

  • Check the part number against the control system, since Balboa and Hot Spring units use different heaters.
  • Check the voltage on the listing, and for a 240V setup, a licensed electrician should install the circuit.
  • Check manifold size and tubing: the Autopartsfreer heater uses 3/4″ vinyl tubing, and the Bzsunway manifolds are 15″ long and 2″ in diameter.
  • Check the stated product dimensions against the space in the equipment bay before ordering.

Score notes

The Chill Score scores each heater on performance, build, value, safety and warranty, without printing a score in this prose. No listing here states a safety certification, so safety is zero for all picks, and only the Autopartsfreer and Bzsunway 58117 listings state a warranty term.

Product Chill Score Perf. /35 Build /25 Value /25 Safety /10 Warranty /5
Autopartsfreer Heater 9.5 30 21 20 0 3
Bzsunway 58117 Heater 9.5 28 21 20 0 3
Winsgor M7 Heater 9.4 28 20 20 0 0
Bzsunway 58083 Heater 9.4 28 20 19 0 0

Scores run from 9.2 to 9.8: each product’s point total is placed on that range, so more points always means a higher score.

The Autopartsfreer heater suits Hot Spring and Tiger River owners who want a titanium element, while the Bzsunway 58117 heater suits Balboa owners who want a stainless element with a stated warranty.

Common questions

Which heater fits my spa?

Match the part number and control system in the listing: the Autopartsfreer heater fits Hot Spring and Tiger River units, while the Bzsunway and Winsgor picks fit Balboa control systems. Check the fitment list in the listing before ordering, since a heater for the wrong system is not a fit.

What voltage do these heaters use?

Listings state 120V and 240V options, with kilowatt ratings that differ by voltage: the Autopartsfreer heater lists 1.5KW at 120V and 6KW at 240V, and the Bzsunway 58117 heater lists 1.0kW at 120V and 4.0kW at 240V. For a 240V setup, a licensed electrician should install the circuit.

Does a warranty come with these heaters?

The Autopartsfreer heater lists a 1-Year Warranty, and the Bzsunway 58117 heater lists a 1 year warranty. The Winsgor and Bzsunway 58083 listings state no warranty term, so a buyer who wants a stated warranty should choose from the picks that state one.

Why do the Bzsunway 58083 listings disagree on voltage?

The title states 220V, while the bullets state 240V and 120V, so the listing contradicts itself on voltage. Confirm the voltage before ordering, since the title and the bullets do not agree.

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