How to Heat A Hot Tub Without A Heater?

22 minutes read

Heating a hot tub without a heater can be a challenging task but it is possible. Here are a few methods you can explore:

  1. Solar Heating: Utilizing the power of the sun is a popular way to heat a hot tub naturally. You can install solar panels or a solar water heater to capture the sun's energy and transfer it to the tub. This method is more effective in regions with ample sunlight.
  2. Wood Burning: Creating a wood-burning hot tub is another traditional approach. You can build a fire pit nearby and circulate the heated water from the fire into the tub using a pump. However, this requires careful monitoring of the fire and a good understanding of the water circulation system.
  3. Insulation: Improving the insulation of your hot tub can help retain heat for longer periods. By adding additional insulation materials like foam boards, blankets, or covers, you can minimize heat loss and maintain warmer water temperatures.
  4. Ground Heat: Digging a hole or trench and placing the hot tub directly on or near the ground can utilize the natural heat from underneath. The earth's warmth can help keep the water consistently heated, especially if the area remains consistently warm.
  5. Hot Water Addition: If you have a water source nearby that is heated naturally, such as a geothermal spring or well, you can introduce this hot water directly into the tub. This method requires access to a suitable water supply and some plumbing modifications.
  6. Hot Stones: Adding hot stones to your hot tub can increase its temperature. Heat the stones in a fire or oven, and then transfer them into the tub using tongs. Be careful not to overload the tub with too many hot stones to avoid damaging the tub or causing burns.


Remember, heating a hot tub without a heater may not provide as consistent or precise temperature control as using a dedicated heater. It is essential to prioritize safety, regularly monitor the water temperature, and make adjustments accordingly when using alternative heating methods.

Best Hot Tubs of April 2024

1
MSPA, Oslo, Frame Series, Fixed Body, Movable, Hot Tub & Spa, Wi-Fi, App Controlled, Jets & Bubble System – 6 Person

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.
2
Intex PureSpa Plus 6 Person Inflatable 94" Square Outdoor Hot Tub Spa with 170 Bubble AirJets, Insulated Cover & LED Color Changing Lights, Greystone

Rating is 4.9 out of 5

Intex PureSpa Plus 6 Person Inflatable 94" Square Outdoor Hot Tub Spa with 170 Bubble AirJets, Insulated Cover & LED Color Changing Lights, Greystone

  • ✔ 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
  • ✔ PREMIUM ACCESSORIES – Everything you need for pure relaxation! Let your worries bubble away with 2 contoured headrests, an energy efficient spa cover, and a mood-setting multi-colored LED light (requires 3 AAA batteries, not included)
  • ✔ BUILT-IN FASTFILL INFLATION SYSTEM – Designed with a convenient FastFill inflation system; just simply inflate and deflate at a touch of a button, no external hose needed
3
Coleman SaluSpa Sicily AirJet 2 to 7 Person Inflatable Hot Tub Round Portable Outdoor Spa with 180 Soothing AirJets and Insulated Cover, Gray

Rating is 4.8 out of 5

Coleman SaluSpa Sicily AirJet 2 to 7 Person Inflatable Hot Tub Round Portable Outdoor Spa with 180 Soothing AirJets and Insulated Cover, Gray

  • SaluSpa Sicily AirJet hot tub provides a soothing massage experience with 180 bubbling warm jets for up to 7 people while reaching up to 104 degrees Fahrenheit for ultimate relaxation
  • Features Freeze Shield automatic heating function to prevent inner components from freezing and 2 easy-lift, built-in handles for easy transport; Water capacity (80 percent filled): 314 gallons
  • Includes a reinforced cover that holds in heat when the spa isn't in use and helps keep dust and debris out of the water, pump, ChemConnect dispenser, filter cartridge, and repair patch
  • Shipping restrictions may apply since this model is not available for sale in the following states: CA, MA, ME, NJ, NV, NY, OR, and RI; Buy only model with energy-efficient EnergySense thermal cover
4
Life Smart 4 Person Plug and Play Thermal Friction Heating Square Hot Tub Spa with 13 Jets, Cover, and Multi Color LED Lighting System, Taupe

Rating is 4.7 out of 5

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

  • Provides relaxation at the touch of a button for up to 4 people with the convenient digital command center with a quick assembly, no need for custom wiring or installation
  • 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
5
Bestway Miami SaluSpa 2 to 4 Person Inflatable Round Outdoor Hot Tub Spa with 140 Soothing AirJets, Filter Cartridges, Pump, & Insulated Cover, Black

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
6
Coleman SaluSpa AirJet 2 to 4 Person Round Inflatable Hot Tub Portable Outdoor Spa with 60 Soothing AirJets and Insulated Cover, Black

Rating is 4.5 out of 5

Coleman SaluSpa AirJet 2 to 4 Person Round Inflatable Hot Tub Portable Outdoor Spa with 60 Soothing AirJets and Insulated Cover, Black

  • Relaxing inflatable spa ensures ultimate relaxation in comforting warm water with the 2 to 4-person hot tub that has 60 soothing air jets and a water capacity of 192 gallons
  • Made of durable materials and cushioned floors that hold strong against the elements for stability and comfort allowing you to indulge in relaxation regardless of weather conditions
  • Built with a digital control panel that allows you to adjust the temperature and jets without leaving the tub ensuring a seamless and enjoyable soaking experience
  • Equipped with 2 easy-lift handles to conveniently help move the empty spa pool while the insulated cover and safety locks that keep the water warm when the spa is not in use
  • Includes a chemical floater and 2 filter cartridges to ensure the water stays clean with little maintenance work; Disclaimer: This spa cannot be used in temperatures less than 39 degrees Fahrenheit
7
Coleman SaluSpa Inflatable Hot Tub Spa | Portable Hot Tub with Heated Water System and 140 Bubble Jets | Fits Up to 4 People

Rating is 4.4 out of 5

Coleman SaluSpa Inflatable Hot Tub Spa | Portable Hot Tub with Heated Water System and 140 Bubble Jets | Fits Up to 4 People

  • 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.
  • ENJOY THE ULTIMATE SPA EXPERIENCE: Nothing beats the feeling of sinking into a warm, bubbling hot tub after a long, hard day while jets project bubbles to massage your back, neck, and shoulders..Water Pump : 0.7A. Massage Tube Blower : 6.5A.Working Pressure : 1.2PSI (0.08Bar)
  • EASY TO OPERATE: The digital control panel lets you dictate the water temperature (up to 104 degrees Fahrenheit) and pressure of the jets. A power saving timer can even automate the temperature of the spa up to 72 hours prior to save energy and money.
  • DURABLE & INNOVATIVE CONSTRUCTION: The spa's durable PVC material and I-beam construction offer superior strength and stability while ensuring your hot tub never loses its shape.
  • SIMPLE SETUP & MAINTENANCE: No extra tools are needed to setup This portable spa. Simply inflate and deflate with the included pump. A cover comes with for an extra Safety feature, maintain the water's warm temperature, and prevent debris from getting in the tub.
  • BENEFITS OF A PORTABLE HOT TUB: With lift handles, the spa can be moved around with ease. This spa deflates compactly for optimal storage and transportation purposes.
8
RELXTIME 73in x 73in 4-6 Person Inflatable Hot Tub Spa, AirJet Outdoor Portable Hottub with 130 Bubble Jets, Filter Cartridges, Insulated Cover, Grey

Rating is 4.3 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.


How to heat a hot tub using a DIY solar water heater?

Heating a hot tub using a DIY solar water heater requires a few steps. Here is a general guide to help you get started:

  1. Collect the Materials: Gather the necessary materials to construct your solar water heater. This typically includes a solar panel or multiple solar panels, a water storage tank, pipes, insulation, and a circulation pump. You may also need additional materials depending on your specific setup.
  2. Consider Placement: Choose a suitable location for your solar water heater system. Ideally, it should be in an area that receives maximum sunlight throughout the day. Ensure that the solar panel is facing south or towards the sun's path.
  3. Build the Solar Collector: Construct the solar collector by setting up the solar panel(s) in a way that optimizes sunlight absorption. Mount the panel(s) securely, tilted at an angle to maximize sun exposure. Connect the pipes to the solar panel(s) to allow water flow.
  4. Connect the Circulation Pump: Connect the circulation pump to the solar collector and the water storage tank. The pump will help circulate water through the solar panels and transfer the heated water to the hot tub.
  5. Insulate Pipes and Storage Tank: To minimize heat loss, insulate the pipes connecting the solar collector, pump, and storage tank. Also, insulate the storage tank itself to retain the heat for more extended periods.
  6. Set Up the Tub Circulation: Connect the hot tub to the water storage tank using appropriate plumbing. Ensure proper fittings and control valves to regulate the water flow between the tub and the tank.
  7. Fill the System and Test: Fill the system with water, ensuring there are no leaks. Turn on the circulation pump and let the water flow through the solar collector. Monitor the temperature increase in the hot tub over time.
  8. Adjust and Optimize: Depending on your specific setup, you may need to adjust the angle of the solar panel(s) or make changes to the circulation pump's speed to optimize heat transfer and efficiency. Experiment and make necessary adjustments until you achieve your desired hot tub temperature.


Remember to exercise caution and follow safety guidelines when working with water, electricity, and any tools involved in the construction process. It may be beneficial to consult professional advice or guidelines specific to your region's climate and regulations before proceeding.


How to heat a hot tub with an electric heating blanket?

Heating a hot tub with an electric heating blanket is not recommended as it can be dangerous. Electric heating blankets are designed for use on beds and are not suitable for use in wet environments like hot tubs. Additionally, heating a hot tub with an electric heating blanket may cause damage to the blanket and its wiring, and can be a fire hazard.


Instead, it is recommended to use a hot tub's built-in heater or a dedicated hot tub heater to maintain the desired water temperature. These are specifically designed for safe and efficient heating of hot tubs.


How to heat a hot tub with a DIY parabolic solar reflector?

Heating a hot tub with a DIY parabolic solar reflector can be an effective and eco-friendly way to enjoy warm water. Here's a step-by-step guide on how to do it:

  1. Design and construct your parabolic solar reflector: Research and determine the size and shape of the parabolic reflector you want to build. Make sure it's large enough to capture sufficient sunlight. Choose a reflective material that is highly reflective, such as aluminum foil, reflective mylar, or reflective aluminum sheets. Construct a sturdy frame to support the reflector material, shaping it into a parabolic curve. You can use PVC pipes or wood for the frame.
  2. Positioning the parabolic reflector: Set up the parabolic reflector in an area where it can receive ample sunlight throughout the day. Ensure there are no obstructions like tall trees or buildings blocking the sunlight. Ideally, the reflector should be adjustable to track the sun's movement throughout the day. This can be achieved by using a mount or stand that allows the reflector to rotate.
  3. Placing the hot tub: Position your hot tub in a place that is easily accessible from the parabolic reflector and near a water source. Ideally, the hot tub should be in direct sight of the parabolic reflector so that maximum sunlight can be captured and reflected onto the tub.
  4. Optimizing heat transfer: Paint the surface of your hot tub dark, as dark colors absorb more heat from the sunlight. Consider covering the hot tub with a transparent or light-colored cover when not in use to retain the heat.
  5. Monitor and maintain: Regularly check the position of the parabolic reflector to ensure it's aligned with the sun. Monitor the temperature of the hot tub using a thermometer or a built-in hot tub temperature sensor. Adjust the position of the parabolic reflector or the hot tub accordingly to achieve and maintain the desired temperature.


Remember, safety is paramount when working with DIY solar projects. Ensure proper construction, stability, and follow safety guidelines when setting up the reflector. Additionally, be cautious when using a hot tub and follow all necessary safety precautions to prevent accidents or injuries.


How to heat a hot tub using an outdoor wood-fired boiler?

To heat a hot tub using an outdoor wood-fired boiler, you'll need to follow these steps:

  1. Evaluate the location: Make sure the outdoor wood-fired boiler is located at an appropriate distance from the hot tub, considering safety, convenience, and plumbing requirements.
  2. Connect the plumbing: Install a dedicated plumbing line between the wood-fired boiler and the hot tub. This line should include a shut-off valve, a circulation pump, and appropriate fittings.
  3. Insulate the plumbing: To minimize heat loss and increase efficiency, insulate the plumbing line using foam insulation tubes or other suitable insulating material.
  4. Prepare the wood-fired boiler: Start by ensuring that the wood-fired boiler is properly filled with water and has enough firewood or other suitable fuel to generate heat.
  5. Start the fire: Ignite the fire in the wood-fired boiler as instructed in the manufacturer's guidelines. Use dry and seasoned firewood for optimal heat output.
  6. Adjust the controls: Adjust the air intake and dampers on the wood-fired boiler to control the intensity of the fire and maintain the desired water temperature.
  7. Start the circulation pump: Turn on the circulation pump to start pumping hot water from the wood-fired boiler into the hot tub. Ensure that the pump is operating correctly and provides sufficient water flow.
  8. Monitor temperature: Regularly monitor the temperature of the water in the hot tub using a suitable thermometer. Adjust the fire intensity or circulation speed as needed to maintain the desired temperature.
  9. Safety precautions: Adhere to all safety precautions recommended by the manufacturer of the wood-fired boiler and the hot tub. This includes adequate safety distances, fire safety measures, and regular maintenance.
  10. Enjoy the hot tub: Once the temperature is at the desired level, you're ready to relax and enjoy your hot tub!


Remember, it is essential to familiarize yourself with the specific instructions provided by the manufacturer of your wood-fired boiler and hot tub, as they may have specific guidelines or precautions that differ from general instructions.

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