Planning power for a hot tub
Check your spa's installation manual for its required circuit size — it's the starting point for the electrical plan. The disconnect generally must be within sight of the spa but at a required minimum distance away from the water.
Plug-and-play 120V spas exist, but they still need a proper GFCI-protected outlet, and many run better on 240V. Placement near overhead lines, windows and decks affects the plan too.
What the work typically involves
Review spa specs
Confirm voltage, amperage and the manufacturer's wiring requirements.
Check panel capacity
Ensure the service can support the new load.
Install circuit and disconnect
Run the circuit and install a GFCI disconnect at the right distance.
Connect and test
Connect the spa, bond as required and test GFCI protection.
Common reasons homeowners call
- Buying a new hot tub
- Replacing an older spa with higher power needs
- Moving a hot tub
- GFCI disconnect tripping
- Spa installed on an extension cord
Warning signs
- GFCI disconnect trips frequently
- Burn marks at the disconnect
- Spa heater and pump can't run together
- Corroded connections
- Tingling in the water
Safety considerations
No extension cords. Never power a hot tub with an extension cord. If anyone feels a tingle in or near the spa, get out, turn off power at the disconnect if safe, and have it checked.
What an electrician will check
- Spa amperage and voltage requirements
- Panel capacity
- Disconnect location and GFCI protection
- Bonding
- Outdoor wiring method
Related electrical problems
Related residential services
Pool Electrical
Pool pump, heater and lighting circuits with the bonding and GFCI protection pools require.
Electrical Panel Upgrade
Increasing your home's electrical capacity — typically 100A to 200A — for EV chargers, heat pumps, additions and modern loads.
GFCI Outlet Installation
Adding GFCI shock protection to kitchens, bathrooms, laundry rooms, garages, basements and outdoor outlets.
Outdoor Lighting
Exterior lighting for porches, patios, decks, driveways and walkways — wired and rated for outdoor use.
Frequently asked questions
It depends on the model. Check the manufacturer's specifications; many 240V spas require 40–60 amp circuits or more.
Moisture in connections, failing heaters or pumps, or wiring issues are common causes.
Only models designed for 120V plug-in use, and they still require GFCI protection. Most full-size spas need a dedicated 240V circuit.