Waterway 3721621-1D 4HP Executive two speed spa pump, 230v 56 frame with 2 inch portsWaterway 4HP Executive Spa Pump, 2 Speed, 230v, 56fr, 2", 3721621-1D$37599
Waterway 3721621-1D 4HP Executive two speed spa pump, 230v 56 frame with 2 inch ports
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Waterway 4HP Executive Spa Pump, 2 Speed, 230v, 56fr, 2", 3721621-1D

Ask a questionMPN 3721621-1D
$37599
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Quick overview

  • Two speed Low speed carries filtration and heating, high speed drives the jets.
  • Rated 4HP The horsepower Waterway lists for this Executive series pump.
  • 230 volt Wired for a 230v spa circuit, so it is not the 115v version.
  • 56 frame motor Built on the 56 frame format used across spa pump motors.
  • 2 inch ports Suction and discharge are both 2 inch.
  • Spa and hot tub duty Waterway lists this pump for spa and hot tub systems rather than main pool circulation.
Full description and specifications ↓

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Product details

The Waterway 3721621-1D is a 4HP Executive series spa pump, two speed, wired for 230 volts, on a 56 frame motor with 2 inch suction and discharge ports.

Why two speed matters on a spa

A spa spends most of its running hours filtering and heating, which needs very little flow. The low speed does that work quietly and cheaply. When the jets are called for, the high speed steps in and delivers the flow the therapy jets were designed around. One pump covers both jobs instead of running flat out all day.

Before you order

Check three things against the pump you are replacing: the supply voltage, the motor frame and the port size. This unit is 230v on a 56 frame with 2 inch ports, and all three have to match for a straight swap. Waterway lists it for spa and hot tub use.

Specifications
Brand Waterway
Manufacturer part number 3721621-1D
UPC 806105077462
Series Executive
Type Spa pump
Horsepower 4HP
Speeds 2 Speed
Voltage 230v
Motor frame 56fr
Port size 2"
Pool type Spa/Hot Tub
Shipping weight 42.45 lb
Ships Parcel

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Questions and answers

What people ask about this product, answered by our pool techs.

What voltage does this pump need?
230v. Waterway lists this Executive pump as a 230 volt unit, so it will not run on a 115 volt supply.
What size are the ports?
2 inch, on both the suction and the discharge side.
Is it single speed or two speed?
Two speed. The low speed handles filtering and heating and the high speed feeds the jets.
What motor frame does it use?
A 56 frame motor, listed by Waterway as 56fr.
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