What Temperature Should I Keep My Inflatable Hot Tub When Not in Use?

After a long day, few things beat sinking into warm, bubbling water. But when your inflatable spa isn’t being used, what do you do—leave it hot, turn it off, or drop the heat?

The short answer: if you use it often, keep it hot. If you’re away for weeks, turn it down—or even drain it for the season. Stick around and we’ll break down the best settings to save energy, protect your spa, and keep your soaks stress-free.

The Ideal Temperature for Your Inflatable Hot Tub When Not in Use

The Short-Term Answer: Use It Often, Leave It Hot

The Energy-Efficiency of Maintaining a Constant Temperature

It might sound backwards, but keeping your spa warm can actually save energy. Constant reheating from cold is like boiling a kettle from scratch every time—it uses far more power than keeping it ticking along.

Preventing Bacterial Growth and Maintaining Water Chemistry

A steady temperature keeps your sanitiser doing its job. Big swings in heat make it harder to keep the water balanced, which could mean cloudy water or even bacteria sneaking in.

Quick and Convenient Soaks

Imagine deciding on a whim to jump in, only to find you’ll be waiting four hours for the water to heat. Keeping it hot means instant spa time—perfect after work or once the kids are finally asleep.

The Long-Term Answer: When to Lower the Temperature

Lowering the Temperature for Extended Periods

If you’re going away for a week or two, lower the temperature to around 10–15°C (50–60°F). It saves energy without risking frozen water or damage to the spa.

When to Drain and Winterise Your Hot Tub

For seasonal breaks—especially in chilly UK winters—draining is often the safest move. Frozen water can split pipes or damage PVC, which is far pricier to fix than a little extra effort upfront. Always follow your manufacturer’s steps for winterising properly.

Factors That Influence the Best Temperature

The Climate and Outside Temperature

Milder weather means you can safely drop the heat. But in colder regions, it’s better to be cautious—water freezes faster than you think.

Your Hot Tub’s Insulation and Cover

A thick thermal cover is like a duvet for your spa. Pair it with an insulating base mat and you’ll keep more warmth in without running up your bill.

Frequency of Use

If you’re hopping in daily, keep it hot. If not, adjust to match your routine.

Energy Costs in Your Area

Electricity prices vary, and so should your settings. If your bills make you wince, a little extra attention to efficiency will pay off.

Saving Money and Energy on Your Inflatable Hot Tub

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The Truth About Inflatable Hot Tub Running Costs

How Much Does an Inflatable Hot Tub Cost to Run?

On average, expect £7–£10 a week in mild weather. In winter, that can climb higher depending on your cover, insulation, and usage habits.

Common Misconceptions About Energy Use

Many owners think switching it off completely is cheaper. In reality, reheating from stone-cold water again and again can be more costly than keeping it at a steady, moderate warmth.

Practical Tips for Improving Energy Efficiency

Invest in Proper Insulation

A spa blanket, cover, or even foam mats underneath make a big difference. Think of it as wrapping your tub in a cosy jumper.

Use the Power-Saving Timer

Set it to heat only when you’ll need it. Some owners swear by smart plugs or timers for hands-off control.

Keep Your Filters Clean and Water Balanced

Dirty filters mean your pump works overtime, chewing through energy. Clean water isn’t just nicer to soak in—it’s cheaper to run, too.

Protect Your Hot Tub from the Elements

Wind steals heat faster than you’d think. Sheltering your spa in a corner or using a windbreak can help lock warmth in.

A Quick Reference Guide: What Temperature to Set Your Hot Tub

Daily use or a few times a week: 37.5–40°C (100–104°F)
Away for 2–6 weeks: Lower by ~5°C or to around 27°C (80°F)
Winter (if not draining): Keep above 10°C (50°F) to prevent freezing
Long-term storage: Drain completely and store in a cool, dry place

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Key Takeaways

Keep your inflatable spa hot if you’re using it often—it saves energy and keeps water safe.
Lower the temperature if you’ll be away for more than a week.
In very cold weather or for seasonal breaks, draining and winterising is the safest option.
Good insulation, a proper cover, and clean filters will save you money on energy bills.
Always consider climate, frequency of use, and local energy costs when choosing the right temperature.

Conclusion: Finding the Right Balance

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When it comes to inflatable spas, there’s no single “perfect” temperature—it depends on how often you use it, the weather, and your budget.

If you’re a frequent soaker, keeping it hot is the easiest and most convenient choice. For longer breaks, lowering the temperature (or draining for the season) keeps your spa safe and your wallet happy.

With a little planning—and a good thermal cover—you’ll strike the right balance between comfort, efficiency, and spa longevity. That way, whether it’s a quick evening dip or a family soak at the weekend, your inflatable spa will always be ready when you are.