Product Description

Bring Your Hot Tub Back to Life with the Balboa Strel15B
Get your spa running smoothly again with the reliable Balboa Strel15B Spa Control System. Shop and order at Western Tub and Pool for the best replacement hot tub repair parts and expert support.
[Shop and order at Western Tub and Pool]
Powerful and Compact Spa Control
The Balboa Strel15B (also known as the Strong Strel 15B) is an advanced OEM replacement spa pack built on the proven Balboa EL series platform. Designed for years of dependable operation, this control system comes complete with the case, circuit board, wiring, and a pre-mounted heater, making it the perfect solution to upgrade your aging or malfunctioning spa pak.
System Outputs and Features
- Pump 1: 2-Speed at 120V or 240V
- Pump 2: 1-Speed or 2-Speed at 120V or 240V
- Air Blower or Pump 3: 120V or 240V
- Circulation Pump: 120V or 240V (Note: Must have a minimum flow rate of 23 GPM. Pumps like Laing, Grundfos, or Waterway Tiny Might do not meet this requirement; Aqua-Flo Circ-Master is highly recommended).
- Heater: Available in 4.0kW or 5.5kW at 240V (M7 technology with tailpieces and gaskets included)
- Ozone: 120V or 240V
- Lighting: 12V Spa Light (Will not operate fiber optic lighting)
Dimensions and Weight
Ensure a perfect fit for your spa's equipment bay with the exact specifications for the Balboa Strel15B:
- Shipping Dimensions: 18 × 12 × 10 inches
- Shipping Weight: 10.00 lbs
- Supply Voltage: 240V - 4 Wire configuration
Compatible Hot Tubs and Topside Controls
The Balboa Strel15B Spa Control System (replacement part numbers 56256, 56256-01, and 56256-02) is widely used across several popular spa brands.
Hot Tub Brands and Models:
- Strong Spas (including the Strong Evolution Spa series)
- QCA Spas (specifically the Moonstone model)
- Various other hot tubs utilizing the 56256 part series
Compatible Topside Controls:
This system does not include a topside control panel, but it easily pairs with Balboa ML series panels, including:
- Balboa ML900
- Balboa ML700
- Balboa ML551 / ML550
- Balboa ML400
Check here and our online catalogue or call us to find the exact matching topside control or overlay for your setup.
Hard to Find Part Assistance
Struggling to find the right replacement hot tub repair parts? We are here to help!
Check your part number if known, or send us pictures, the make and model of the hot tub, and the serial number. Send us an email to fixmytub@gmail.com, or call us for more information or assistance at 1-855-248-0777.
New to hot tubs and pools or just looking for refresher tricks and tips to keep that water crystal clear and inviting? Water care for your hot tub, swimspa or pool is crucial for your comfort and safety. Western Tub and Pool has free tutorials at your home to discuss the intricacies of your spa, hot tub, or pool.
Frequently Asked Questions
What is included in the Balboa Strel15B box?
The STREL15B pack includes the control box case, the internal circuit board, internal wiring, and the pre-mounted heater with tailpieces and gaskets.
Does this system include power cords or a topside control panel?
No, the power cords and topside control panel are sold separately. It is designed to be a direct replacement box, allowing you to reuse your existing compatible ML-series topside panel and pump cords if they are in good condition.
Can I use my existing circulation pump with this spa pack?
You can use your existing circulation pump as long as it pushes a minimum of 23 Gallons Per Minute (GPM) to satisfy the heater's flow requirements. Low-flow pumps will not work with this specific system.
How do I know if this is the correct part for my Strong Spa?
Locate the chip number or part number on your existing control board or the sticker on the side of the spa pack. If it reads STREL15, STREL15B, 56256, 56256-01, or 56256-02, this is the correct direct replacement.
Ready to get your hot tub heating again?
Call us at 1-855-248-0777 or click below to order your exact replacement parts today.
[Shop and order at Western Tub and Pool]
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