DescriptionMaster Spa X320539 Power WOW Pump — 3HP 1-Speed 230V OEM ReplacementThe X320539 Power WOW pump is a genuine OEM replacement spa pump built for Master Spa hot tubs requiring high-output jet power. Rated at 3.0 horsepower with single-speed operation on a 230V circuit, this pump delivers the water flow needed to drive multiple therapy jets at full pressure. It directly replaces the discontinued X320400, with the key difference being the wet end discharge positioned at 12 o’clock rather than 9 o’clock.Key Features & SpecificationsThis pump uses the LX WOW platform, which Master Spas adopted as the successor to the Pentair Ultimax (UltraJet) design. It maintains the same mounting footprint and plumbing connections, making it a direct drop-in replacement with no modifications needed to your spa’s equipment bay.Horsepower: 3.0 HP — high output for driving multiple jet circuitsVoltage / Frequency: 230V / 60 Hz — standard North American 240V spa circuitAmperage: 6.0–6.3 Amps — efficient draw for the power outputSpeed: Single-speed (1 SP)Frame Size: 56 Frame — standard spa pump motor framePlumbing: 2″ intake and discharge connectionsDischarge Position: 12 o’clock (top) — wet end can be rotated to 9 o’clock if your plumbing requires itCompatibility & Cross-ReferenceThis is a genuine OEM Master Spa part. It cross-references to the following part numbers across different suppliers and systems:Master Spa Part#: X320539 (replaces X320400)Balboa Water Group Part#: 1016029UL Model#: PUUMSC302582PRThe X320539 and X320400 are the same pump assembly — the only difference is the wet end discharge orientation. The X320539 ships with discharge at 12 o’clock, while the X320400 was oriented at 9 o’clock. Since the wet end can be rotated, the X320539 works in either configuration.OEM vs. AftermarketThis is a genuine OEM direct replacement part from Master Spas. The current production version uses the LX WOW pump motor, which replaced the original Pentair Ultimax (UltraJet) motor. The LX version maintains identical mounting, plumbing, and electrical connections while offering improved reliability.InstallationDifficulty: Moderate DIY — requires basic spa equipment access and 230V electrical work. Before starting, shut off the GFCI breaker powering the spa. Close any isolation ball valves on the suction and discharge sides of the pump. Disconnect the bonding wire, remove the pump unions, and unbolt the mounting bracket. The existing power cord can typically be transferred to the new pump. If your old pump had discharge at 9 o’clock and the new one arrives at 12 o’clock, the wet end can be rotated to match your plumbing layout.Common Symptoms & When to ReplaceConsider replacing your spa pump if you’re experiencing any of the following: the pump is tripping the GFCI breaker repeatedly, the motor makes a loud grinding noise (indicating worn bearings), the motor hums but won’t start (possible failed start capacitor), or there is visible leaking from the wet end seal area. A typical spa pump lasts 5–7 years with regular maintenance, though heavy use or poor water chemistry can shorten that lifespan.