Understanding Spa Pumps: Motors, Wet Ends, and Key Specifications
When talking about spa pumps, there are two crucial parts to discuss: the motor and the wet end. The wet end, as the name describes, is the part of the pump that comes in contact with the water. The motor is the electric end, which generates the power to move the water past the impeller and through the wet end of the pump. Hot tub pumps have four components to look at: the number of speeds, amp draw/power, frame and voltage.
Spa Pump Speeds: One-Speed vs. Two-Speed Motors
The number of speeds of the hot tub motor is either a one-speed or a two-speed motor. A two-speed motor has a high and low speed setting, whereas a one-speed motor only has one speed setting and is either off or on. In some cases, a one-speed pump can be replaced with a compatible two-speed pump, and only the high speed is used.
Understanding Pump Power and Amp Draw for Hot Tub Motors
Horsepower is often uprated by spa manufacturers for advertising reasons, and some hot tub manufacturers will label pumps with a break horsepower, start-up horsepower, or other inflated number which does not represent the actual operating power of the pump. Because of this, the best way to determine the true power of a pump is with the electrical amp draw listed on the sticker, which may be labelled as "Amps" or "FLA". When replacing an existing motor, the new pump should have an electrical amp draw as close as possible to the original motor. The spa manufacturer has designed the electrical, plumbing and jets of your hot tub to work with that size of motor. Installing a pump with a larger amp draw than the original can cause electrical problems such as overloading or melting of the circuit board, tripping the GFCI breaker or fuses, voiding the electrical certification and water flow problems.
Spa Pump Frame Sizes: 48-Frame vs. 56-Frame Motors
Spa motors generally come in one of two frame sizes, a 48-frame or a 56-frame. A 48-frame motor has 48 copper wires inside, and a 56-frame motor has 56. The frame size also impacts the bolt spacing and physical size of the motor. When replacing a motor, it is critical to note the frame of your existing motor so the bolts will line up. If you are only replacing the wet end of your pump, it is also vital to determine the frame of your motor, as the wet end will not affix to the motor unless it’s the right frame size.
Matching Pump Voltage: 115V vs. 230V Hot Tub Motors
Knowing what voltage of electricity is powering your spa motor is very important. Many pumps are available in both 115-volt and 230-volt options. Ensure you are using a motor with the correct voltage, as the hot tub and your electrical components have been designed for a specific voltage, and the wrong voltage will not function correctly.
How to Choose a Compatible Replacement Spa Pump
If you are trying to replace your spa motor, be sure to match up the number of speeds, amps, frame, and voltage of your current motor to confirm you are getting a compatible replacement. Have questions about replacing your pump? Give us a call at 1-877-845-1993.