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Use the calculator for an instant estimate, or read on for a full breakdown of how this cost is calculated.
Quick Answer
$50–$100/month
Varies by equipment & usage
Hot tub energy use comes from two sources: the heater (to maintain water temperature) and the circulation/jet pumps. The heater is the dominant cost — it runs for hours each day to offset heat loss through the shell and cover.
A typical hot tub has a 5–6 kW heater. If it runs 4 hours/day to maintain temperature in moderate weather: 5.5 kW × 4 hrs × 30 days × $0.16/kWh = $105/month. In warmer climates or with a high-quality insulated cover, heater run time drops significantly.
Jet pump use is secondary — a typical 2 HP jet pump draws about 1,500 watts. An hour of jet use per day adds: 1.5 kW × 1 hr × 30 days × $0.16 = $7.20/month.
Estimate Your Cost
Heater size
5.5
kW
Heater hrs/day
3
hrs
Jet use hrs/day
1
hrs
Electricity rate
0.16
$/kWh
Est. monthly cost
$86.56
~6,492 kWh/year
Insulation quality — poorly insulated shells and covers are the biggest cost driver
Cover quality — a well-fitting insulated cover dramatically reduces heat loss
Outdoor temperature — cold climates require much more heating energy
Set temperature — each degree lower saves noticeable energy
Jet and circulation pump hours
Hot tub size — larger volume = more water to heat
Electricity rate in your area
Pro Tip
The biggest savings usually come from upgrading the least efficient items first. Use Watt Wisdom to see exactly which loads are driving your bill before spending money on improvements.
Watt Wisdom calculates your full household energy profile — every appliance, your climate zone, and your usage habits — and tells you exactly what's driving your bill.
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