How to Keep Heat In A Hot Tub in 2025?

Keeping heat in a hot tub is essential to ensure that the water stays warm and comfortable for longer periods. Here are some suggestions:

Insulation: One of the most effective ways to keep heat in a hot tub is through adequate insulation. Ensure that the hot tub is well-insulated using materials such as foam insulation in the cabinet or cover. Insulation prevents heat loss and maintains water temperature.
High-quality cover: Always use a high-quality cover specifically designed for your hot tub. The cover should fit properly and be in good condition without any cracks, gaps, or tears. Make sure to use it whenever the hot tub is not in use to prevent heat from escaping.
Air leaks: Check for any air leaks around the hot tub that may contribute to heat loss. Seal off any gaps, cracks, or spaces with weatherstripping or caulking to keep the heat trapped within.
Windbreakers: If your hot tub is located in an area with strong winds, consider installing windbreakers such as fences, plants, or privacy screens. These will help block the wind and reduce heat loss.
Time of use: Try to plan your hot tub usage during the warmer parts of the day. Using the hot tub during colder evenings or nights can result in faster heat loss as the temperature difference between the water and the surrounding air increases.
Reduce opening and closing: Avoid unnecessary opening and closing of the hot tub cover while it's in use. Every time the cover is opened, heat escapes, and it takes time for the water to regain its warmth. Instead, keep the cover closed and open it only when necessary.
Consistent heating: If your hot tub has a heating system, maintain the temperature consistently rather than allowing it to drop and then reheating it. Consistent heating will help prevent rapid heat loss.

Remember that keeping heat in a hot tub also relies on regular maintenance, such as ensuring proper water circulation, checking for any leaks, and maintaining the heating system. By taking these measures, you can enjoy a cozy and warm hot tub experience for an extended period.

Best Hot Tubs of 2025

Rating is 5 out of 5

MSPA, Oslo, Frame Series, Fixed Body, Movable, Hot Tub & Spa, Wi-Fi, App Controlled, Jets & Bubble System – 6 Person

EASY ASSEMBLY: Plug & play system & simple 4 easy screws on 4 corners, no tools required and rest is all plug in modules. Hard Body frame with Rhino Tech 6 layer reinforced PVC inner liner
WI-FI ENABLED & APP CONTROLLED: Say goodbye to the days of reaching over your spa or worse having to get out of your relaxing soak just to change some settings. Have full control of your MSpa at all times right at your fingertips. Enjoy the easiest operation and usability through our intuitive UI. Easily receive tips, notices, and alarm messages on the go so you’re always in the loop.
OLED TOUCH SCREEN: All your spa controls in one convenient unit! Easily control your spa from your easy to use control center. Our newest all-in-one control box now features a protective cover to shield from harsh outdoor elements such as direct sunlight and extreme weather conditions.
HYDROMASSAGE JETS PLUS: Going beyond just comfort, hydromassage provides amazing health benefits for your mental and physical health. Enjoy an immersive at home experience that has been shown to relieve muscle soreness and tension, soothe minor aches and pains, and reduce stress and anxiety.
LED LIGHT - LIGHT UP THE NIGHT: Take your spa experience to the next level with beautiful lighting. Our light up spas feature an LED light strip at the bottom to make your spa GLOW. Translucent fabric elements allow beautiful patterns to shine through for a truly romantic environment for your evening soaks. Switch colors based on your mood and enjoy late into the night.
REVOLUTIONARY FIXED BODY: HOT TUB & SPA option for houses, apartments, buildings, or tight spaces that does not have access to move a normal Fixed Frame Hot Tub over the roof.
SMART FILTRATION: To ensure the best quality of water in the spa, the filter cartridge is suggested to be cleaned after each use and replaced every 3-5 days. Feel hard to follow the tips each time? Don’t worry there will be a reminder popping up at least once a week when spa keeps working.
ALL-AROUND BUBBLING DESIGN: 360° air jet system fills the spa with thousands of bubbles, staggered jets push bubbles into the center of the spa creating a balanced, all-encompassing body massage.
ANTI-ICING SYSTEM: When the water temperature is lower than 1°C (33.8°F), the heater runs automatically until the water is heated up to 3°C (37.4°F). This will help prevent water from freezing. The circulation system, pump, and pipe will be saved.

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Rating is 4.9 out of 5

Life Smart LS100 Taupe 4 Person Plug and Play Thermal Friction Heating Square Hot Tub Spa with 13 Jets, Black Cover, & Multi Color LED Lighting System

Provides relaxation at the touch of a button for up to 4 people with the convenient digital command center with a quick assembly; Includes lightweight polyester cover that resists abrasions and is less prone to fading from the sun
Pampering yourself is easy with the 13 hydrotherapy high-powered jets with an underwater, multi-color LED light system, giving you the ultimate spa experience
Energy efficient and exceeds California Energy Commission mandates for hot tub energy consumption, so there is no need to turn the temperature down while not in use
Innovative thermal friction heating system eliminates the need for a separate heater with full-foam insulation, and the included thermal locking cover will keep the heat in
Water capacity of 205 gallons with an exterior of 70 inches long, 61 inches wide, and 32 inches tall, while the interior measures 57 inches wide and 28 inches tall

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Rating is 4.8 out of 5

4 PERSON HOT TUB 1200W HEATER - ALEKO Inflatable Hot Tub with hot tub accessories heats up to 104°F at 5°/hr. Easy 5 minute set up with automatic inflation hose. Portable hot tub is cleaner and hotter with included tub cover (polyurethane).
AUTOMATIC INFLATION, EASY SETUP - ALEKO 4 Person Inflatable Hot Tub features push-button automatic inflation, easily portable. Inflatable tub heats quickly with powerful hot tub heater and tub cover. ALEKO Outdoor Hot Tubs remain clean with inflatable pool filter (x3).
ALL MATERIALS INCLUDED: ALEKO 160 Gallon Tub (5' x 5' x 2' feet), fitted polyurethane cover to maintain heat, inflation hose, 3 filters, 1 filter cover, ground cloth, rubber plug, repair kit, 1200W Heater, 1800W (110-120V) power pack, 600W bubbler, 120 Volt AC filter pump. Connect directly to outlet for best results.
DIGITAL PANEL, BUBBLER JETS - ALEKO Portable Hot Tub features massaging jet bubbles, temperature control, and inflation on easy to use digital panel. Upgrade to ALEKO home spa and tub for convenient use all year long, for travel and vacations, customer support and premium quality.
ELEGANCE AND QUALITY - ALEKO 4 Person Inflatable Hot Tub provides long lasting service for your family. We stand behind the Amazon 30-day money-back guarantee. Customer service available to assist with shipment, delivery, measurement, install, and tech support needs.
ALEKO does not ship Inflatable Hot Tubs to residents of California, due to state requirements for energy efficiency.

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Rating is 4.7 out of 5

Intex 28481E Simple Spa 77 Inch x 26 Inch 4 Person Outdoor Portable Inflatable Round Heated Hot Tub with 100 Bubble Jets, Carry Bag, and Cover, Gray

Pamper and treat yourself with the 100 soothing high-powered jets that give you the ultimate spa experience in relaxing water up to 104 degrees Fahrenheit
Round 77 by 26-inch above-ground blow-up tub provides relaxation at the touch of a button for up to 4 people with the easy-to-use tilt-adjustable control panel
Spa for adults has a built-in hard water treatment system ensures a gentle feeling on skin, clothes, and the entire spa system; Water capacity: 210 gallons
Includes insulated cover, heater/blower system, 2 filter cartridges, thermal ground cloth, inflation hose, carry bag, floating chlorine dispenser, and test strip
Disclaimer: This item requires 28523E energy efficient cover for purchases shipped to California, if not, the order is subject to be canceled due to shipping restrictions

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Rating is 4.6 out of 5

Bestway Miami SaluSpa 2 to 4 Person Inflatable Round Outdoor Hot Tub Spa with 140 Soothing AirJets, Filter Cartridges, Pump, & Insulated Cover, Black

Round 2 to 4-person spa has you relaxed in no time with a soothing massage system, rapid heating, and integrated water filtration
Built-in AirJet system with 140 jets releases warm air into the water, while the digital control panel adjusts the temperature up to 104 degrees Fahrenheit
Features a FreezeShield automatic heating function to prevent inner components from freezing during colder temperatures to ensure long-lasting use
Includes a pump, an insulated cover, cupholders, ChemConnect dispenser to main clean water, filter cartridges, and repair patch
Constructed of durable DuraPlus materials with cushioned, comforting floors and a convenient drain valve for ultimate stability; Dimensions (L x W x H): 71 x 71 x 26 inches

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Rating is 4.5 out of 5

RELXTIME 73in x 73in 4-6 Person Inflatable Hot Tub Spa, AirJet Outdoor Portable Hottub with 130 Bubble Jets, Filter Cartridges, Insulated Cover, Grey

RELAXING INFLATABLE SPA: Square 4 to 6-person spa has you relaxed in no time with a soothing massage system, rapid heating, and integrated water filtration. Using a touch digital control panel, easy to inflate & deflate
DURABLE & INNOVATIVE CONSTRUCTION: The spa's durable PVC material and beam construction offer superior strength and stability while ensuring your inflatable spa never loses its shape
ENERGY EFFICIENT SPA COVER: Inflatable cover provides extra insulation and minimizes heat loss; this cover will help protect your Hot Tub from rainwater pooling
FREEZE PROTECTION: Freeze protection automatic heating function prevents inner components from freezing, you can use your inflatable spa in colder temperatures
ACCESSORIES: 1 pool cover, 1 inflatable caover, 4 seat cushions, 2 filter cartridges & 2 covers, 20 strips water testing, 2 PVC patches, 1 spanner, 1 inflation hose, 1 air valve cap, 1x way valve, 1 x barometer, 1 drainage bung, 2 child safety key, 1 power cable, 1 storage bag, 1 instruction manual.

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Rating is 4.4 out of 5

Intex SimpleSpa Bubble Massage 4 Person Inflatable Round Hot Tub Relaxing Outdoor Water Spa with Soothing Jets, Insulated Cover, and Storage Bag, Gray

Inflatable hot tub offers relaxation in comfort with 100 soothing high-powered jets for a refreshing massage and an ultimate spa experience
Features an all-in-1 control unit to adjust the heating system to suit personal preferences of water temperatures
Accommodates up to 4 people with a convenient cup holder, a floating chemical dispenser, and 2 easy-to-replace filter cartridges for cleaner water
Sturdy horizontal beam construction for stability that withstands outdoor elements for long-lasting use with a water capacity of 210 gallons
Includes an insulated cover to minimize heat loss, a thermal ground cloth, and a carry bag for easy storage; Dimensions (L x W x H): 77 x 77 x 26 inches

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Rating is 4.3 out of 5

Bestway Helsinki SaluSpa 7 Person Inflatable Outdoor Hot Tub Spa with 180 Soothing AirJets, Filter Cartridges, Pump, and Insulated Cover, Brown Wood

ATTENTION: Shipping restrictions may apply. This model is not available for sale in the following states: CA, MA, ME, NJ, NV, NY, OR, RI. Residents of these states may select the comparable Bestway model sold with energy-efficient EnergySense thermal cover to avoid cancellation.
Round 5 to 7-person spa has you relaxed in no time with a soothing massage system, rapid heating, and integrated water filtration
Built-in AirJet system with 180 jets releases warm air into the water, while the digital control panel adjusts the temperature up to 104 degrees Fahrenheit
Features a FreezeShield automatic heating function to prevent inner components from freezing during colder temperatures to ensure long-lasting use
Constructed of durable drop stitch material that provides rigidity while still being lightweight for easy portability when deflated
Includes a pump, an insulated cover, cupholders, a ChemConnect dispenser to main clean water, a filter cartridge, and a repair patch

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Rating is 4.2 out of 5

Jleisure Avenli Aegean 1,200 Liter 65 inch 6 Person Portable Rigid Foam Wall Hot Tub Spa with Insulated Cover and Floor Protector, Black

Rigid Foam Spa measures 65 inches long, 65 inches wide, and 27 inches tall, the ideal size for up to 6 adults
Insulated foam walls act as an insulator and retain the heat whilst the Tri-Tech PVC material provides a durable shell for durability and longevity
Features 90 bubble jet holes and a 104-degree Fahrenheit rapid heating system for longer and more comfortable spa relaxation anytime
Digitally controlled pump for a user-friendly operation; Note, filter and filter cartridge are located in the back pocket of the pump
Includes insulated top cover with double-locking safety clips, floor protector, pump unit, 2 filter cartridges, flexible inflation hose, and repair patch

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Rating is 4.1 out of 5

INTEX 28441EP PureSpa Greywood Deluxe Spa Set: Includes Energy Efficient Spa Cover – Spa Control App – Wireless Control Panel – 6 Person Capacity – 85" x 28"

✔ FIBER-TECH BEAM CONSTRUCTION – Innovative Fiber-Tech Technology offers superior structural stability while maintaining a comfortable surface for a luxorious and refreshing spa experience
✔ THE ULTIMATE SPA EXPERIENCE – Control all Spa functions from your phone or tablet; program Spa use and maintenance remotely with WIFI connectivity; available on App Store and Google Play App
✔ REMOVABLE WIRELESS CONTROL PANEL – The Greystone Deluxe PureSpa includes a removable wireless control panel that features integrated wireless charging; 48 hours of operation on a single charge and conveniently attaches to top of the tub
✔ ENERGY EFFICIENT SPA COVER – High density thermal-resistant foam provides extra insulation and minimizes heat loss; this cover enhances the Spa performance while improving the energy efficiency by as much as 50%
✔ PREMIUM ACCESSORIES – Everything you need for pure relaxation! Let your worries bubble away with 2 contoured headrests and a mood-setting multi-colored LED light (requires 3 AAA batteries, not included)
✔ CUSTOMER SATISFACTION – Our dedicated customer service team is available via phone, chat, or email to help with any questions you may have on use, installation, or service needs; INTEX's 1-Year Manufacturer Limited Warranty gives you peace of mind

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Rating is 4 out of 5

INTEX 28429EP PureSpa Plus Bubble Massage Spa Set: Includes Energy Efficient Spa Cover – 2 Contoured Headrest – LED Light – 4 Person Capacity – 77" x 28"

✔ FIBER-TECH BEAM CONSTRUCTION – Innovative Fiber-Tech Technology offers superior structural stability while maintaining a comfortable surface for a luxorious and refreshing spa experience
✔ HARD WATER TREATMENT SYSTEM – Built-in Hard Water Treatment System makes water gentler on skin, clothes and the entire spa system; hard water buildup limits water flow and reduces the life of your spa
✔ HEATED AIR BUBBLE TECHNOLOGY – The Positive Temperature Coefficient (PTC) heater is designed to maximize heat transfer to the water, while ensuring the highest level of safety, performance, and longevity
✔ ENERGY EFFICIENT SPA COVER – High density thermal-resistant foam provides extra insulation and minimizes heat loss; this cover enhances the Spa performance while improving the energy efficiency by as much as 50%
✔ PREMIUM ACCESSORIES – Everything you need for pure relaxation! Let your worries bubble away with 2 contoured headrests and a mood-setting multi-colored LED light (requires 3 AAA batteries, not included)
✔ CUSTOMER SATISFACTION – Our dedicated customer service team is available via phone, chat, or email to help with any questions you may have on use, installation, or service needs; INTEX's 1-Year Manufacturer Limited Warranty gives you peace of mind

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How to reduce heat loss through evaporation in a hot tub?

To reduce heat loss through evaporation in a hot tub, you can follow these steps:

Use a high-quality hot tub cover: Invest in a well-insulated, durable hot tub cover that fits tightly over the tub. The cover should effectively seal the surface, preventing heat loss through evaporation.
Keep the cover on when the hot tub is not being used: Always keep the hot tub covered when it's not in use, even for short periods. This minimizes the surface area from which heat can escape through evaporation.
Reduce the hot tub's temperature: Lower the temperature of the hot tub to the desired level before use, but avoid exceeding what's comfortable for you. This reduces the temperature differential between the water and the surrounding air, which in turn decreases the rate of evaporation.
Install windbreaks or barriers: If your hot tub is exposed to windy areas, consider installing windbreaks or barriers around it. This helps minimize the effects of wind on heat loss through evaporation.
Use a hot tub insulating blanket: Apply an insulating blanket or cover to the water's surface while the hot tub is not in use. This additional layer of insulation helps reduce heat loss through evaporation.
Regularly check and maintain the hot tub's seals: Ensure that the hot tub's seals are intact and undamaged. Damaged seals can allow warm air to escape, leading to increased evaporation and heat loss. Replace any worn-out or damaged seals promptly.
Reduce overall water surface area: Whenever possible, minimize the water surface area in the hot tub. By filling the tub to the appropriate level, you decrease the opportunity for water to evaporate and lose heat.

By implementing these measures, you can significantly reduce heat loss through evaporation in your hot tub, improving energy efficiency and ensuring a more enjoyable and cost-effective experience.

What is the importance of using a thermal blanket in a hot tub?

Using a thermal blanket in a hot tub is important for several reasons:

Heat retention: A thermal blanket helps to reduce heat loss from the hot tub water. It acts as an insulating barrier between the water and the surrounding environment, preventing heat from escaping. This allows the hot tub to maintain a desired temperature more efficiently and reduces the energy required to heat the water.
Energy efficiency: By minimizing heat loss, a thermal blanket can significantly reduce energy consumption. As the hot tub doesn't have to work as hard to maintain its temperature, it requires less power or fuel to operate. This leads to cost savings and ensures that the hot tub operates in an environmentally friendly manner.
Evaporation prevention: A thermal blanket also helps to prevent water evaporation from the hot tub. Evaporation not only leads to unnecessary water loss but also causes heat loss. By covering the water surface, the thermal blanket reduces the amount of water exposed to the air, effectively reducing evaporation and maintaining the water level of the hot tub.
Chemical preservation: The use of a thermal blanket can help preserve the chemicals in the hot tub water. When the hot tub is uncovered, chemicals like chlorine can dissipate due to exposure to sunlight and air. By covering the water surface, the thermal blanket protects the chemicals from degradation, ensuring their effectiveness and reducing the need for frequent chemical adjustment.
Debris prevention: A thermal blanket also acts as a barrier against debris such as leaves, dust, and insects. This helps to keep the hot tub water cleaner and reduces the time and effort required for regular maintenance and cleaning.

Overall, using a thermal blanket in a hot tub is crucial for optimizing energy efficiency, reducing water evaporation and chemical loss, as well as maintaining water cleanliness.

What is the best insulation material for a hot tub?

The best insulation material for a hot tub is typically foam insulation. Insulation is important for a hot tub as it helps to maintain the desired water temperature, reduce heat loss, and increase energy efficiency. Foam insulation can be in the form of spray-in foam or foam panels. It provides excellent thermal resistance and effectively prevents heat from escaping the hot tub. Additionally, foam insulation also helps in soundproofing and provides structural support to the hot tub.

How to Keep Heat In A Hot Tub?

Best Hot Tubs of 2025

How to reduce heat loss through evaporation in a hot tub?

What is the importance of using a thermal blanket in a hot tub?

What is the best insulation material for a hot tub?

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