How much does a hot tub cost to run?
A hot tub typically draws around 3000 W while running. Ratings vary widely between models, so check the label and change the figure below.
per kWh
W
g CO2 per kWh
Cost per year
1228.44
- Cost per month
- 102.37
- Cost per day
- 3.37
- Cost per hour of use
- 0.84
- Energy per year
- 4387.3 kWh
- Energy per day
- 12.0200 kWh
- Carbon dioxide per year
- 1096.8
- Annual cost of standby alone
- 2.04
Show the working
- Power = 3000
- Hours per day = 4
- Days per year in use = 365
- Electricity price = 0.28
- Standby power = 1
- Grid carbon intensity = 250
- kw = 3000 / 1000 = 3
- daily_kwh = 3 * 4 = 12
- standby_kwh = 1 / 1000 * (24 - 4) = 0.02
- Energy per day = 12 + 0.02 = 12.02
- Energy per year = 12.02 * 365 = 4387.3
- Cost per day = 12.02 * 0.28 = 3.3656
- Cost per year = 4387.3 * 0.28 = 1228.44
- Cost per month = 1228.44 / 12 = 102.37
- Cost per hour of use = 3 * 0.28 = 0.84
- Carbon dioxide per year = 4387.3 * 250 / 1000 = 1096.83
- Annual cost of standby alone = 0.02 * 365 * 0.28 = 2.044
Values are shown to six significant figures here; the arithmetic itself runs on exact fractions and is only rounded where a number is printed.
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The formula
- daily energy = power in kW x hours
- annual cost = daily energy x days x price per kWh
Nameplate wattage is the maximum draw, not the average. A cycling appliance like a fridge or a freezer averages far less.
Standby draw is small per device and adds up across a house: ten devices at 2 W each is 175 kWh a year.
Running cost of a hot tub at different tariffs
| Price per kWh | Per hour | Per year at 4 h/day |
|---|---|---|
| 0.10 | 0.3000 | 438.00 |
| 0.15 | 0.4500 | 657.00 |
| 0.20 | 0.6000 | 876.00 |
| 0.25 | 0.7500 | 1095.00 |
| 0.30 | 0.9000 | 1314.00 |
| 0.40 | 1.2000 | 1752.00 |
Frequently asked
How many watts does a hot tub use?
Typically around 3000 W while running, though models vary. Check the rating plate.
How much electricity does it use per day?
About 12.00 kWh at 4 hours of use.
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