The Waterway 3711621-1D hot tub pump is a single speed that runs on 12.0 amps at 220 - 240 volts. The thread size is referenced as 2 inches with an actual OD dimension on 3 inches.
- 4 HP Waterway Executive hot tub pump, 1 Speed heavy duty 56 frame,
- Waterway OEM part # 3711621-1D,
- 2.0" intake and 2.0" discharge, (Actual measurements 3" outside on intake and discharge)
- 220-240volt,
- 12.0 Amps high speed (3450 RPM)
- New cord and unions not included, sold separately.
IMPORTANT
The PF- model number from your old pump should not be used as a reference for selecting a new replacement pump as Waterway has produced up to 4 known variations of pumps with the same model number which are different enough that they are not interchangeable. Always select a replacement pump with the same part number as the Waterway part number on the label on your old pump. Also note Waterway has changed the model number from PF-40-1N22C to PF-30-1N22M, it's still the same pump.
Horsepower ratings
Choosing a pump based on Horsepower (HP) can be incorrect. The horsepower listed in your spa manual or on the old pump's label may be overinflated, inaccurate, or even left blank. Horsepower ratings on hot tub pumps are often listed as SPL-HP, BHP, MBHP, RHP or S-HP, which is not the same as continuous operating horsepower. Installing an oversized pump in your hot tub can cause significant damage.
To avoid choosing the incorrect pump, confirm if it’s a 48 frame or 56 frame, then use the high-speed Amperage rating listed on the old pump's label to find the correct replacement instead of the horsepower. The amperage rating is listed with both high/low speed for a 2-speed pump.
Determining hot tub pump thread size
Hot tub pump plumbing sizes are nominal and not the actual outside diameter (O.D.) of the threaded intake or discharge. To confirm your old pump thread sizes, use a tape measure and check the diameter of your old pump thread size.
- 1.5” Pump thread measures approx. 2-3/8” Outside Diameter
- 2.0” Pump thread measures approx. 3” Outside Diameter
- 2.5” Pump thread measures approx. 3-5/8” Outside Diameter
Amperage ratings
New hot tub pump amperage ratings may vary slightly for pumps with the same performance rating. The RPMs remain the same 3450 for high-speed and single-speed pumps and 1725 for low-speed for two-speed pumps.
