Leaving inflatable spas running 24/7 might sound convenient, but it usually costs more in the long run. Continuous heating keeps the water warm but racks up energy bills. On the other hand, reheating from cold can also be pricey. The answer depends on your usage, climate, and energy-saving habits.

The Thermodynamics Behind Hot Tub

Running Costs

Heating from Cold vs. Maintaining Temperature

How a Thermostat Works

Inflatable hot tubs use an electric heater and thermostat to maintain water temperature. The thermostat kicks the heater on and off to balance heat loss, especially when outside temperatures fluctuate.

The Role of the Heater and Pump

The heater provides consistent warmth, while the pump circulates water to prevent hot and cold spots. Both require electricity, and running them nonstop increases costs significantly.

Key Factors that Influence Energy Consumption

Ambient Air Temperature and Climate

British winters make spas lose heat quickly, forcing the heater to work harder. Summer use is cheaper because the water holds heat for longer.

Quality of Insulation (Cover, Base, and Walls)

A good insulated cover and ground mat can dramatically reduce heat loss. Poor insulation leads to higher costs, as the heater works overtime.

Frequency and Duration of Use

If you’re soaking daily, maintaining heat may be cheaper than reheating from cold every time. For occasional use, standby or off-mode is more economical.

Desired Water Temperature Setting

Running your spa at the maximum setting (around 40°C) costs more than keeping it slightly cooler. Small adjustments can mean big savings.

Practical Tips to Reduce Inflatable Hot Tub Running Costs

Optimizing Your Hot Tub Setup

Using an Insulated Cover and Ground Mat

A high-quality insulated cover and ground mat prevent unnecessary heat loss. They’re essential for reducing energy bills.

Choosing a Sheltered Location

Placing your spa near a wall, under a canopy, or away from the wind reduces heat loss and energy use.

Filling the Hot Tub with Warm Water

Starting with warm tap water shortens heating times and saves money on that initial energy spike.

Smart Usage Habits to Save Energy

Utilizing the Power Saving Timer

Set heating schedules with a timer or smart plug so your hot tub is only warm when you need it.

Limiting Bubble/Jet Function Use

Jets and bubbles are fun but burn through energy fast. Use them in short bursts rather than leaving them on constantly.

Maintaining Water Chemistry and Clean Filters

Balanced chemicals and clean filters make your heater and pump more efficient, reducing energy waste.

When to Turn Off Your Inflatable Hot Tub

Extended Periods of Non-Use (e.g., vacation)

If you’re away for more than a week, it’s smarter to lower the temperature or turn the spa off completely.

Draining and Refilling the Hot Tub

For long breaks, drain, clean, and cover your tub. Fresh water reduces maintenance issues when you start it up again.

Winterizing Your Hot Tub

In cold months, if you’re not using the spa, drain it, clean it thoroughly, and store it to prevent freezing damage and unnecessary bills.

Key Takeaways

• Leaving inflatable spas on 24/7 is convenient but often costly.

• Heating from cold isn’t free either—it depends on how often you use it.

• Insulation (covers, mats, and placement) makes a huge difference to running costs.

• Smart habits like timers, reduced jet use, and clean filters help cut bills.

• For long breaks, turn it off, drain it, or winterise it to avoid wasting energy.

Conclusion

So, is it cheaper to leave an inflatable hot tub on all the time? Not usually—but it depends on how you use it. If you’re hopping in daily, keeping it warm might make sense. If it’s more of a weekend treat, reheating when needed is often cheaper.

With a little smart thinking—like insulating properly, lowering the temperature when not in use, and using timers—you can enjoy bubbly soaks without the shock of sky-high bills. After all, inflatable spas are meant to be relaxing… not stressful for your wallet.