Meet the Motor - ThruBolt BN34, a rugged, two-speed spa motor built to keep hot tubs and spa systems circulating with reliable power. Crafted by US-Motors, this 2 HP, 230V unit is a practical, retrofit-friendly solution for a wide range of spa pump assemblies, delivering dependable flow across both speeds.
Two-speed performance that adapts to your spa needs
Operate with precision thanks to a true 2-speed design. High-speed mode delivers strong circulation for quick heat-up and jet activity, while low-speed mode provides energy-efficient filtration and quieter operation. On the electrical side, the motor draws approximately 8.6 A at high speed and 3.4 A at low speed, helping you manage load and energy use without compromising performance.
Key features
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Frame: 48Y — a common, retrofit-friendly footprint that fits many spa pump assemblies
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Horsepower: 2.0 HP (total)
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Voltage: 230V, single-phase
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Speed: 2-speed (2-Spd)
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Shaft: Threaded shaft for secure coupling
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Motor style: Through Bolt
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Capacitor: On Top: No (not mounted on top)
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Manufacturer: US-Motors
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Model references: BN34 / SPH20FL2S
Why this motor stands out
Designed specifically for spa and hot tub systems, the BN34 through-bolt motor delivers consistent torque and smooth operation across speeds. Its threaded shaft and through-bolt mounting simplify retrofit and installation, reducing downtime during service. The 48Y frame preserves compatibility with a wide array of spa pumps, letting you upgrade without reworking plumbing or electrical components.
Ideal use cases
- Replacing a failing 2 HP spa motor in 230V, 48Y-frame equipment
- Dual-speed circulation for varied spa programs—rapid jet action or energy-conscious filtration
- Service scenarios where reliable, low-maintenance drive is essential
Installation tips and considerations
Before replacing, verify your wiring and control setup match a 230V supply and a two-speed configuration. The through-bolt mounting and threaded shaft require correct alignment with the pump coupling to prevent vibration. If your system uses a separate capacitor, note that this unit does not have a top-mounted capacitor, so plan for any external capacitor requirements accordingly.
| Motor Type |
Spa |
| Motor Amperage |
8.6A/3.4A |
| Voltage |
230v |
| Frame Type |
48Y |
| Speed |
2 Speed (2-Spd) |
| Horsepower |
2.0hp |
| Total Horsepower |
2.0thp |
| Motor Shaft Type |
Threaded |
| Motor Style |
Thru Bolt |
| Capacitor On Top |
No |
| Manufacturer |
US-Motors |
