Chiller power draw
The chiller is the part of a cold plunge that plugs in. These are the published figures for common sizes:
| Chiller | Power | Cooling | Source |
|---|---|---|---|
| Penguin 1/2 HP | 110 to 120V, 3.9 A, 450 W | 5,000 BTU/hr | Penguin |
| Penguin 1 HP | 110 to 120V, 7.2 A, 830 W | 10,000 BTU/hr | Penguin |
| Active Aqua 1/2 HP | 5.4 A, 510 W | 4,020 BTU/hr | Retailer listing |
| Active Aqua 1 HP | 10.2 A, 1,100 W | 10,050 BTU/hr | Retailer listing |
The Penguin numbers come from the manufacturer. The Active Aqua numbers come from retailer listings, so confirm them on the unit's label. A dedicated 20 amp circuit is common practice for a chiller, but we have no code citation that requires one. Your electrician can tell you whether your existing outlet is shared with other loads.
GFCI protection
Water plus electricity is the one part of a cold plunge setup not to improvise. According to Mike Holt's guide to NEC Article 680, a permanently installed immersion pool, which includes a cold plunge, falls under NEC 680.45. That section applies the spa and hot tub rules, and under 680.44 the outlet supplying the unit needs GFCI protection unless the listed unit has GFCI built in.
Mike Holt is a respected secondary source, not the code text itself, so your electrician and inspector have the final word. Plunge makers point the same way: Redwood Outdoors tells buyers to "plug into a GFCI protected outlet."
Placement and clearance
A chiller works by dumping heat into the air around it. If that air cannot move, the chiller ends up breathing its own exhaust. Penguin's owner material (we have seen it via search and a dealer-hosted copy of the manual, so check the manual that ships with your unit) says:
- Leave at least 12 inches of open space on all sides.
- Do not enclose the chiller in a cabinet or let hot exhaust recirculate.
- The ambient operating range is about 37 to 100°F.
- Drain it before freezing weather.
The Las Vegas heat problem
The National Weather Service recorded an all-time Las Vegas high of 120°F on July 7, 2024, beating the previous record of 117°F. That is well above the roughly 100°F ambient ceiling Penguin lists. On the hottest afternoons, an outdoor chiller in full sun is working outside its rated range.
Our reasoned advice (this is our judgment, not a manufacturer spec):
- Put the chiller in shade and out of direct sun. A north or east wall, or a ventilated shade structure that still keeps the 12 inch clearance, is better than an open patio.
- Keep an insulated lid on the tub whenever you are not in it, so the chiller is not fighting sun on the water too.
- Consider a larger chiller than the tub size alone suggests if the plunge lives outdoors year-round.
- Check and clean filters often. Desert dust loads them faster.
Before you buy
- Pick the spot and measure the 12 inch clearance around the chiller.
- Confirm a GFCI protected outlet, or have an electrician install one.
- Plan shade for the chiller and a lid for the tub.
- Read the specific chiller's manual for its ambient limits.
Frequently asked questions
How much power does a cold plunge chiller use?
Less than most people expect. Penguin lists its 1/2 HP chiller at 3.9 amps and 450 watts and its 1 HP chiller at 7.2 amps and 830 watts, both on 110 to 120V. Retailers list the Active Aqua 1 HP at 10.2 amps and 1,100 watts.
Does a cold plunge need a GFCI outlet?
Plan on it. Per Mike Holt, a secondary source on the NEC, a permanently installed cold plunge falls under NEC 680.45, which applies the spa rules in 680.44 and calls for GFCI protection unless the listed unit has it built in. Redwood Outdoors also tells buyers to plug into a GFCI protected outlet.
Can a chiller handle a Las Vegas summer?
Not without help. Penguin lists an ambient operating range of about 37 to 100°F, and Las Vegas hit a record 120°F on July 7, 2024. Shade the chiller and keep it out of direct sun. Our further advice on lids, dust and sizing up is reasoned guidance, not a manufacturer spec.
How much clearance does a chiller need?
Penguin material calls for at least 12 inches of open space on all sides, and says not to enclose the chiller in a cabinet or let its hot exhaust recirculate.
Do I need a dedicated circuit?
A dedicated 20 amp circuit is common practice, but we have no code citation requiring it. Ask your electrician.
Keep reading
Browse our cold plunges collection, see all guides, or ask us a question about your project.