The Bullfrog model 451 seats five people and is spacious for its size. This model is an ideal choice for smaller families or groups. The spa features four JetPak-equipped seats and room for one more person on the cool-down bench. This bench also provides a great raised seat for children and can be used to get in and out of the spa. One of the seats is a specialty chair... a contoured lounger with calf jets. The 451 also has a pulsating foot jet in the footwell. This spa is unique in the industry because of its ergonomic design.

| 451 | Specifications | |
| Dimensions (W x L x H) | 6'7" x 7'4" x 36" (2.01m x 2.24m x .91m) | |
| Seating Capacity | 5 Adults | |
| JetPaks | 4 | |
| Foot and Leg Jets | 6 | |
| Jets Available | 41 | |
| Jets Available (with Shower Jets) | 248 | |
| Water Capacity | 304 Gallons (1151 Liters) | |
| Dry / Max Filled Weight (with Cover) | 663 lbs. / 4024 lbs. (301 kg / 1825 kg) | |
| Control Pad | Premier (8-Button) | |
| Auxiliary Control Pad | One Auxiliary (Optional) | |
| High Performance Industrial Pump(s) | One Dual-Speed 56-Frame | |
| Total Pump Horsepower | Up to 4.8 HP Brake (2.5 HP Continuous) | |
| Lighting | Underwater: Large White, Optional 28-Bulb LED | |
| Filter Element (Top Accessible) | 50 ft2 (4.65 m2) | |
| WellSpring Heater™ | 5.5kW, Dual Overheat Protection | |
| WellSpring Ozone Purification System | Optional | |
| WellSpring Filtration pump | 35 GPM (160 LPM) (Optional) | |
| Electrical Requirements | 240V- 30/50A | |
| Spa & Yard™ Stereo System | CD Player and AM/FM Stereo with Bose® Speakers (Optional) | |
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