Wondering how much it costs to heat and run a RELXTIME inflatable hot tub? The actual cost depends on your electricity rate, starting water temperature, outdoor temperature, how often you use the spa, and how well you keep the heat in.
For the US version, the hot tub has a maximum power consumption of 1,350W (1.35 kW) when all functions are running.
How Much Does It Cost to Heat a RELXTIME Hot Tub?
Based on typical heating times, water can take approximately 8–23 hours to reach 104°F, depending on the starting water temperature.
| Starting Water Temperature | Approx. Heating Time to 104°F | Approx. Electricity Used* | Estimated Cost at $0.20/kWh* |
|---|---|---|---|
| 50°F | About 23 hours | About 31.1 kWh | About $6.22 |
| 68°F | About 14 hours | About 18.9 kWh | About $3.78 |
| 86°F | About 8 hours | About 10.8 kWh | About $2.16 |
*Estimated using 1.35 kW × heating time and an electricity rate of $0.20/kWh. Actual electricity consumption and cost may vary depending on outdoor temperature, starting water temperature, insulation, and operating conditions.
What About the Cost of Regular Use?
Once your water reaches the desired temperature, the heater does not need to run continuously at maximum power. It cycles as needed to maintain the water temperature.
For example, if you heat the water from 68°F to 104°F, the initial heating period is approximately 14 hours:
1.35 kW × 14 hours = 18.9 kWh
At $0.20 per kWh, that is approximately $3.78 for the initial heating period.
Your actual weekly or monthly cost will depend on how often the heater needs to operate to maintain the water temperature, as well as how often you use other spa functions.
What Affects Hot Tub Running Costs?
Several factors can affect your electricity consumption:
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Starting water temperature: Colder water takes longer to heat.
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Outdoor temperature: The heater works more slowly when the ambient temperature is below 50°F (10°C).
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Target temperature: A higher temperature requires more heating.
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Frequency of use: More frequent use can increase heating time.
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Insulation: A cover and floor mat can help reduce heat loss.
In cold weather, heating the water to the desired temperature can take 12–24 hours, depending on the starting water temperature and ambient conditions.
How Can I Reduce Heating Costs?
Keeping heat in is just as important as heating the water.
Keep the spa covered during heating and when it is not in use. RELXTIME also recommends using a floor mat to provide better heating and insulation effects.
For more tips, read How Can I Reduce Hot Tub Heating Costs?
You can also learn more about keeping your water warm in How Can I Keep My Hot Tub Water Warm?
For additional insulation, explore the RELXTIME Insulation Suit & Mat.
How to Calculate Your Own Cost
You can estimate your heating cost with this simple formula:
Power (kW) × Heating Time (hours) × Electricity Rate = Heating Cost
For example:
1.35 kW × 14 hours × $0.20/kWh = $3.78
Your actual cost will vary based on your local electricity rate and how you use your RELXTIME hot tub.
