LX spa pumps are some of the most widely used pumps in the hot tub industry. You’ll find them across dozens of major brands because they are reliable, affordable, and built around standardized designs.

But that same standardization creates confusion when it’s time to replace one.

Especially internationally.

And especially when trying to determine horsepower versus amperage.

This guide breaks down:

• How LX pump numbers actually work
• Why brand numbers don’t mean it’s a different pump
• Mounting differences that cause ordering mistakes
• Why amperage matters more than horsepower
• Why U.S. amp charts do not translate to 50Hz systems
• Why you must know your HP class when ordering pump parts

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Important: We Primarily Ship Pump Parts Internationally

At HotTubPartsOfAmericaGlobal.com, we typically ship:

• Wet ends
• Impellers
• Seal kits
• Volutes
• Motor components

We do not regularly ship complete pump assemblies internationally due to freight costs.

But you MUST still determine the correct horsepower class in order to order the correct parts.

Impellers, seals, and wet ends are horsepower-specific.

Get the HP class wrong — the parts won’t fit.

Fortunately, we cross-reference by part number so you don’t guess.

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How LX Pump Part Numbers Are Structured

Most LX spa pumps begin with:

WUA

Common horsepower classes include:

WUA100
WUA150
WUA200
WUA300
WUA350
WUA400
WUA500

The number refers to the horsepower class — but that is only part of the story.

The characters before and after that number are critical.

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Breaking Down A Full LX Pump Number

Example:

56WUA400II

Here’s what it means:

56 → 56-frame motor
WUA → LX pump series
400 → 4 HP class (marketing class)
II → Two-speed motor

If you see:

56WUA300I

That means:

56-frame
3 HP class
Single-speed

Even one letter difference can change:

• Speed
• Mounting
• Electrical load
• Internal configuration

Always verify the full number.

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The LX WUA Horsepower Reality (Very Important)

LX horsepower labeling does not align perfectly with real electrical output.

Let’s look at real numbers for 230V / 60Hz models:

WUA200 → ~8 amps → marketed as 2 HP
WUA300 → ~10 amps → marketed as 3 HP
WUA400 → ~12 amps → marketed as 4 HP

Using real-world electrical logic:

8 amps ≈ 1 HP
10 amps ≈ 2 HP
12 amps ≈ 3 HP
14 amps ≈ 4 HP
16 amps ≈ 5 HP

So when LX calls a WUA400 a 4HP pump, electrically it draws about 12 amps — closer to what I would call a 3HP motor.

In simple terms:

LX horsepower ratings are roughly 2 amps higher than what the electrical output suggests.

This applies to 230V / 60Hz.

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Now For 50Hz International Systems

If you are outside the United States operating on:

220–240V
50Hz

You cannot use the U.S. amperage chart.

50Hz motors:

• Run slower
• Draw different amperage
• Are rarely true high-HP residential pumps
• Do not follow the same inflated labeling patterns

Typical 50Hz ranges:

2HP class → ~7–9 amps
3HP class → ~9–11 amps

True “5HP” residential 50Hz pumps are uncommon.

Do not convert HP using a 60Hz chart.

Match your nameplate amperage exactly.

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Why Spa Brands Make LX Pumps Look “Proprietary”

Many manufacturers use the same LX pump but assign their own internal number.

Example:

Watkins part number 1431601-03
= LX 56WUA400II

The pump did not change.

Only the catalog number did.

Other brands list both numbers on the same label:

56WUA400II
6500-352
6500-365
6500-367

Those additional numbers are internal identifiers — not different pumps.

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The Mounting Base Issue (Most Common Ordering Mistake)

Most commonly seen in:

Jacuzzi®
Sundance®
Dimension One®

These systems often use:

• Separate removable base plate
• Large worm-drive clamp
• Rotating motor mount design

If you order a standard fixed-base LX pump without realizing yours uses a clamp-style base, it may not align correctly.

Always verify mounting style.

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Horsepower Is Marketing — Amperage Is Reality

When replacing a pump:

Ignore the advertised HP.
Match the amperage.

Two-speed example:

10.0 / 3.5

10 amps = high speed
3.5 amps = low speed

Always use the high-speed number.

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Why “Upgrading” Can Burn Things Up

Installing a higher-amp pump increases load.

That can overload:

• Control boards
• Heater circuits
• Relays
• Wiring
• Breakers

Example:

Two 16-amp pumps = 32 amps
5.5 kW heater ≈ 21 amps
Total = 53 amps

Most spas are wired for 50 amps.

The math doesn’t support two true 5HP pumps in most systems.

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Special Warning For 115V Plug-And-Play Spas

True 2HP 115V pumps are extremely uncommon.

Increasing amperage can:

• Melt plugs
• Overheat wiring
• Damage control boards
• Trip breakers

Never increase amperage in 115V systems.

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Frame Size: 48 vs 56

48 Frame → approx 5¾ inches
56 Frame → approx 6½ inches

Frame must match for:

• Bolt pattern
• Wet end alignment
• Plumbing orientation

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Why HotTubPartsOfAmericaGlobal.com Saves You Money

Hot tub manufacturers do not build pumps.

They purchase from companies like LX and apply proprietary numbers.

We convert those numbers into the correct LX equivalents based on:

• Voltage
• Frequency
• Amperage
• Speed
• Frame size
• Mounting configuration
• Wet end orientation

You get the correct part without inflated branding markup.

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Need Help Identifying Your LX Pump or Parts?

Before ordering:

Text clear photos of your motor label
Include mounting base photos
Tell us voltage and breaker size

? Text: +1-772-800-5445
☎️ Call: +1-844-500-4645
✉️ Email: dvillanueva@spapartsnet.com

HotTubPartsOfAmericaGlobal.com

We verify before you buy — especially for international orders.

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About The Spa Guy

With over 25 years of hands-on spa repair and diagnostics experience, The Spa Guy focuses on real-world electrical matching and compatibility — not marketing hype.

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Important Disclaimer

HotTubPartsOfAmericaGlobal.com is not affiliated with, endorsed by, or connected to Jacuzzi®, Sundance®, Dimension One®, Watkins®, Hot Spring®, Tiger River®, Caldera®, or Solana®. All brand names are used strictly for compatibility and identification purposes.