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3 HP EX2 Spa Pump 2 Speed 230V 3421821-1U 3.00HP 230V - Bubbles Supply

3 HP EX2 Spa Pump 2 Speed 230V 3421821-1U

Part #: 3421821-1U

$1251.53
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Also replaces

3421821-1U
1-year warrantySame-day ship before 3pm CTPerfect Fit Guarantee30-day returns

About this spa pump

The Waterway EX2 3 HP 2-Speed Spa Pump delivers reliable circulation and jet power for larger residential spas and hot tubs. This 230V pump features a robust 3 horsepower motor with dual-speed operation (12.0A high speed, 3.5A low speed) and 48Y frame construction, making it ideal for spas requiring strong water flow and energy-efficient filtration cycles.

Built with Waterway's proven EX2 design, this pump offers the exact fit and performance your spa needs to maintain optimal water circulation. At Bubbles Supply, we guarantee this pump will fit your application perfectly, and we back every unit with our comprehensive 1-year warranty. Plus, we ship same-day to get your spa running quickly. Before installation, verify your existing pump's horsepower, voltage, and plumbing connections match these specifications to ensure proper fit and performance.

Exact part number

3421821-1U

Save this for ordering or warranty claims

Also known as / Replaces

This part replaces or is interchangeable with:

  • 3421821-1U
  • EX2 Pump 3421821
  • Waterway 3HP 48Y Spa Pump
  • Waterway EX2 3HP 2-Speed

Looking for an older part number? Check our supersession lookup tool

Technical specifications

Voltage
230V
Horsepower
3.0 HP
Frame size
48Y
Speed
Two-speed
Amperage
12.0A high speed / 3.5A low speed

Common symptoms this part fixes

If your spa is showing any of these signs, this part is likely your fix:

  • Pump won't start or turns on then immediately trips breaker
  • Motor hums but impeller won't spin
  • Weak or no jet pressure at high speed
  • Spa shows DR or DRY error code due to circulation failure
  • Pump runs only on one speed
  • Excessive noise or grinding from motor bearings

Not sure if this is your problem? Try our diagnostic centre or .

Before you buy — quick checklist

  • Confirm your existing pump is rated 3 HP at 230V — check the motor label, not just the spa manual
  • Verify your spa wiring supports a 2-speed pump (requires separate high/low speed terminals at the board)
  • Measure your existing plumbing union size and confirm it matches this pump's inlet/outlet ports before ordering
  • Confirm your existing pump uses a 48Y frame — measure shaft height and compare to your current motor
  • Check whether your spa controller is compatible with a 2-speed Waterway EX2 configuration
  • Photograph your existing pump's wiring diagram before disconnecting anything

Reading the checklist now prevents 90% of returns. Worth the 60 seconds.

Install difficulty: Medium — Some experience neededTypically 60-90 minutes

What's in the box

  • Waterway EX2 pump assembly (motor + wet end)
  • Union O-rings
  • Installation documentation

If your order is missing any items listed above, contact hello@bubblessupply.com within 48 hours of delivery.

Warranty

1 year manufacturer warranty against defects

Covers manufacturing defects. Does not cover improper installation, normal wear, or accidental damage.

Warranty claims: warranty@bubblessupply.com

Perfect Fit Guarantee

Ordered with our help and the part doesn't fit? Contact us before installation. We'll resolve it with an exchange, replacement recommendation, or return approval.

Learn about our Perfect Fit Guarantee →

Shipping

We ship across the US and Canada. US orders ship from our US warehouse to US customers; Canadian orders ship from our Canadian warehouse to Canadian customers — no cross-border shipping, no surprise duties. In-stock orders placed before 3pm CT ship same day. Standard shipping $9.95 flat rate. Free shipping on orders over $200. Express options available at checkout.

Returns

30-day hassle-free returns on unused parts in original packaging. Contact us before returning to receive your RMA number.

Frequently asked questions

Check the Compatibility section above to confirm fitment for your spa brand and model. If your model is not listed, use our fitment selector at /pages/find-my-part or ask our parts AI for a personalized recommendation.

In-stock orders placed before 3pm CT ship the same day. You will receive tracking information by email as soon as your order ships.

We accept returns within 30 days of delivery for unused items in original packaging. Email returns@bubblessupply.com with your order number to start a return. Installed electrical parts cannot be returned for safety reasons.

Yes, all new parts come with a 1-year warranty against manufacturing defects. Warranty does not cover damage from improper installation or normal wear and tear.

Customer reviews

AI Fitment Assistant

Tell us your spa model and we will confirm this part fits before you buy.

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