How Much Electricity Does A Hot Tub Heater Use?
A hot tub heater typically uses about 4,000 watts while running. At 3 hours a day that is 6 kWh per day, 180 kWh per month and 2,190 kWh per year (assuming it draws full power about 50% of the time).
Calculate your own cost
- Per hour
- $0.352 kWh
- Per day
- $1.056 kWh
- Per week
- $7.3542 kWh
- Per month (30 days)
- $31.50180 kWh
- Per year
- $383.252,190 kWh
Formula: watts ÷ 1,000 × hours × rate. Edit any box and every number updates instantly.
People also ask
How much does a 4,000-watt hot tub heater cost per hour?
At $0.175/kWh, it costs $0.35 per hour. The maths: 4,000 W ÷ 1,000 = 4 kWh per hour, × $0.175 = $0.70. This page assumes it draws full power about 50% of the time, so the hourly figure shown is lower.
How much does it cost per month?
Used 3 hours a day for 30 days, it costs about $31.50 per month and uses 180 kWh. Change the hours in the calculator above to match how you use it.
How many kWh does it use?
6 kWh per day, 180 kWh per month and 2,190 kWh per year at 3 hours a day. A kWh is one kilowatt (1,000 W) used for one hour. It is the unit on your electricity bill.
How can I lower the cost?
Keep the insulated cover fitted when not in use and check for heat loss. Check your bill for the exact rate and enter it above.
Does my electricity rate change the answer?
Yes, a lot. At 10¢ per kWh the monthly cost is $18.00 and at 30¢ it is $54.00. Find your rate on your bill (total cost ÷ kWh used) and type it into the calculator.
Cost by hours of use
| Used per day | Energy per day | Cost per day | Cost per month | Cost per year |
|---|---|---|---|---|
| 1 hour | 2 kWh | $0.35 | $10.50 | $127.75 |
| 2 hours | 4 kWh | $0.70 | $21.00 | $255.50 |
| 3 hours | 6 kWh | $1.05 | $31.50 | $383.25 |
| 4 hours | 8 kWh | $1.40 | $42.00 | $511.00 |
| 5 hours | 10 kWh | $1.75 | $52.50 | $638.75 |
| 6 hours | 12 kWh | $2.10 | $63.00 | $766.50 |
| 7 hours | 14 kWh | $2.45 | $73.50 | $894.25 |
| 8 hours | 16 kWh | $2.80 | $84.00 | $1,022.00 |
| 9 hours | 18 kWh | $3.15 | $94.50 | $1,149.75 |
| 10 hours | 20 kWh | $3.50 | $105.00 | $1,277.50 |
| 11 hours | 22 kWh | $3.85 | $115.50 | $1,405.25 |
| 12 hours | 24 kWh | $4.20 | $126.00 | $1,533.00 |
| 13 hours | 26 kWh | $4.55 | $136.50 | $1,660.75 |
| 14 hours | 28 kWh | $4.90 | $147.00 | $1,788.50 |
| 15 hours | 30 kWh | $5.25 | $157.50 | $1,916.25 |
| 16 hours | 32 kWh | $5.60 | $168.00 | $2,044.00 |
| 17 hours | 34 kWh | $5.95 | $178.50 | $2,171.75 |
| 18 hours | 36 kWh | $6.30 | $189.00 | $2,299.50 |
| 19 hours | 38 kWh | $6.65 | $199.50 | $2,427.25 |
| 20 hours | 40 kWh | $7.00 | $210.00 | $2,555.00 |
| 21 hours | 42 kWh | $7.35 | $220.50 | $2,682.75 |
| 22 hours | 44 kWh | $7.70 | $231.00 | $2,810.50 |
| 23 hours | 46 kWh | $8.05 | $241.50 | $2,938.25 |
| 24 hours | 48 kWh | $8.40 | $252.00 | $3,066.00 |
How we worked it out
- Energy per hour: 4,000 W ÷ 1,000 = 4 kWh, × 50% of the time at full power = 2 kWh
- Cost per hour: 2 kWh × $0.175 = $0.35
- Cost per day: × 3 hours = $1.05
- Month and year: × 30 days = $31.50, × 365 days = $383.25
About hot tub heater running costs
Hot tubs use electricity for both water heating and circulation. Heater duty depends heavily on insulation, cover use, temperature and weather.
Typical sizes: 3,000 W, 4,000 W, 5,000 W, 6,000 W.
How to spend less: Keep the insulated cover fitted when not in use and check for heat loss.
What this estimate assumes
- The appliance draws full power about 50% of the time, because it cycles on and off.
- Wattage is the typical label value, not a measured value. Check the label on your own appliance.
- The rate is an approximate residential average. Your bill may include fixed fees, tiers or time-of-use pricing. Edit the rate above.
- A month is 30 days and a year is 365 days.