Laboomkey RDKH 2000W Immersion Water Heater,Portable Bucket Heater With Digital Lcd Thermometer, Stainless Steel Guard Anti-Scalding Submersible Water Heater For Pool Bathtub,Ul Listed






- Fast Heating - The immersion water heater is rated at 2000W and operates at 110-125V AC. Porous design with good thermal conductivity. It will quickly heat 5 gallons of water with high power in a few minutes(longer in winter).If too much water is heated it takes more time or more than two products are used at the same time
- Safety And Practicality - This UL-recognized immersion portable hot tub heater is equipped with a 304 stainless steel shield that prevents direct contact between the internal heating element and people or animals, making it safer to use and preventing burns.Heat dissipates to the water faster by flowing through the holes in the guard.our upgrade design ensures optimal performance.It is recommended not to use it continuously for more than three hours and never forget to unplug it
- Widely Used - The immersion water heater can be used not just for small inflatable swimming poolsbetter results with more than two heaters working at the same timebut also for hot tubs, bathtubs, buckets,camping shower,farm animals water, window washing water and more
- Easy To Use - Take Electric Submersible water heater immerse in water at proper level,Plug into any grounded 120V AC outlet.with a digital LCD thermometer, easy to measure water temperature. Check power indicator light to make sure immersion water heater is working .Please note - people and animal can't be in the water while the heater is working
- After Sales - - Before using the immersion water heater, please read the instructions carefully and follow the precautions. If you are experiencing problems using the product or if the product does not meet your expectations please feel free to contact us
Turbro MANATEE M20 Swimming Pool Heat Pump - 20,000 Btu - For Above And In Ground Pools And Spas - High Efficiency, All Electric Heater








- Extend Your Swimming Season - The TURBRO Manatee series pool heat pump warms pools of up to 104; great for cooler spring and fall days; maintains a comfortable water temperature but is not intended to turn your pool into a hot tub
- Cost-Saving Choice - High efficiency with a titanium heat exchanger; heating capacity of 20,000 BTU and a COP rating of 5.58; harnesses heat from the air; cut costs by up to 30% compared to using natural gas and up to 60% compared to propane
- For Above-Ground Pools - Compact design and portable for inflatable pools, frame pools, small spas, and smaller in-ground pools; compatible with saltwater pools
- One-Person Assembly - Comes with hose clamps, hose connectors, and an installation guide; simply connect hoses and plug it in to use, no professional help needed; water hoses and a pool filter are not included
- Safe Use - IPX4 waterproof rating; equipped with a UL STD. 943 compliant three-prong plug and an ETL-approved GFCI leakage protection switch; automatically or manually lock the control panel to prevent accidental changes
Fibropool FH 270 Swimming Pool Heat Pump - Fh270 70,000 Btu - For Above And In Ground Pools And Spas - High Efficiency, All Electric Heater






- CLEAN AND GREEN - The FH270 is powered by clean electricity, reducing the harmful environmental effects and cost of traditional heaters that use natural gas or propane. Our pumps instead move heat from the air into the water, which saves you money and is a breeze to maintain
- COMPATIBLE WITH - In ground pools up to 15,000 gallons and above ground pools up to 27 foot round or 18 by 33 foot oval. As with all heat pumps, we recommend using in a humid climate down to 50 degrees for best performance. Dry climates are better served by a traditional gas heater
- HIGH EFFICIENCY - Utilizing high-pressure differential compressors and titanium heat exchangers, FibroPool heat pumps are meticulously designed to be the most energy efficient in their class. You can rest comfortably knowing your family will enjoy years of late season swimming without feeling a squeeze on your electric bill
- RUGGED DESIGN - Enamel-coated steel chassis is designed to withstand outdoor elements season after season. Slim profile measures just 13"x38"x27", offering a wide range of mounting options. Conveniently installs with included 1 1/2 inch compression fittings on a 240 volt circuit
- EASY OPERATION - Digital control panel with an easy-to-read display offers convenient temperature setting and monitoring. Optional extension cable allows you to mount the control panel in a location that works best for you
Hayward W3H400FDN Pool Heater, 400,000 Btu








- The Hayward Universal H-Series 400,000 BTU Natural Gas Heater delivers premium heating performance for years of reliable, long-lasting comfort
- A durable cupro nickel heat exchanger offers exceptional protection against corrosion and premature failure caused by unbalanced water chemistry
- Industry-leading hydraulic design reduces circulation pump run time to provide major energy savings
- Front-panel-only access and intuitive control pad provide easy operation, service and maintenance
- Low NOx emissions meet air quality standards in all low-NOx areas, ensuring low environmental impact
Wopoltop RCDF-030 100,000 Btu Full Dc Inverter Pool Heat Pump For Swimming Pools, Dual Function Of Heating And Cooling, 30Kw Electric Pool Heater








- Full Frequency Conversion Design - WOPOLTOP 30KW pool type heat pump is suitable for both above ground and underground water pools, with a recommended maximum pool capacity of 26000 gallons. The compressor and fan adopt frequency conversion technology to minimize power consumption and eliminate the need for frequent on/off cycles, thereby saving energy.
- Advanced Compressor - Equipped with high-quality compressors, the 100000 BTU heat pump can provide excellent heating power in different working conditions, with a COP of up to 6.8, ensuring first-class performance and stability. The fully DC variable frequency fan motor and compressor can adjust the heating capacity within the maximum range, achieving the most efficient operation.
- WiFi Control for Heating and Cooling - The heat pump has a dual function of heating and cooling, and the wireless WiFi control function allows for remote and complete control of the heating system of the swimming pool. Seamless adjustment of settings and monitoring of temperature levels through smartphones or tablets brings you endless convenience and peace of mind.
- Noise Reduction and Vibration Reduction Design - The high-quality compressor adopts anti vibration technology, and the set includes four sound insulation pads supported by sound insulation materials. All connection points are equipped with additional sound insulation materials, effectively reducing vibration and damping noise. Maintain a noise level of around 47~58 decibels within a distance of approximately 1 meter.
- High Quality ABS Material - The casing of the WOPOLTOP heat pump is made of high-quality ABS material, ensuring high corrosion resistance, rust resistance, durability, and lightweight. It can withstand outdoor conditions such as sunlight and rain well (attention should be paid to preventing lightning strikes), effectively extending the service life of the equipment.
Mxmoonant WJW2A Pool Heater 11Kw 220V







- Touchscreen Display - - Compared to traditional temperature knobs, the upgraded touchscreen display on the 11KW pool heater improves visibility and control. The temperature is visually displayed and can be more accurately controlled with ease.
- Automatic Circulating Heating - - The swimming pool heaters will cycle on and off based on the preset temperature. When the water temperature reaches or surpasses the preset level, the pool thermostat will automatically shut off. Conversely, if the temperature drops below the preset level, the pool thermostat will automatically turn on againch
- Efficient Heating Tube - - The electric pool heater is equipped with 304 stainless steel heating tubes, which provides excellent thermal conductivity. This efficient heat transfer through the heating tubes speeds up heating times and lowers energy costs.
- Professional Wiring Method - - Since a hot tubl heater is a high-powered machine, it is designed to be hardwired rather than plugged inch Therefore, it is important to have a licensed electrician handle the installation process. They can ensure your safety and proper wiring to maximize the efficiency and lifespan of your pool heater.
- Notice - - 11KW Pool heaters are suitable for pools of around 1000 gallons. In addition, the heating time of a pool heater depends on various factors such as the size of the pool, the desired temperature increase, the power of the pool heaters, and the ambient temperature.
Nxqwll YHACHI0126 1500W 120V Titanium Heater Assembly With Sensor, For Bathtub Pool Water Tank Cattle Trough






- Enjoy Instant Hot Water - Equipped with a powerful 1500W titanium heater, the high thermal conductivity ensures that even at extremely low temperatures, the water temperature can be raised to the comfortable temperature you expect in the shortest time. No more waiting for lengthy heating times, enjoy warm hot water immediately
- Precise Temperature Control - The temperature sensor can be directly immersed in the liquid to ensure real-time monitoring of water temperature. The temperature accuracy is within 0.1C, providing you with an excellent temperature control experience
- Widely Applicable Scenarios - The temperature control range is wide, from -40 to 240 (-40 to 120), meeting different needs. It can be widely used in kitchen sinks, bathtubs, spa bathtubs, hot tubs, etc. Storage tanks, ponds, cattle and sheep drinking troughs and other scenes
- Safe and Reliable - Use high-quality wires to prevent potential electrical risks. Compared to stainless steel, titanium alloy heating rods have excellent heat resistance and high corrosion resistance. Equipped with overload protection to prevent the temperature from exceeding the safe range and ensuring all-round safety of use
- One-button Operation - Easy to operate, just press the button to easily set your desired temperature. It is equipped with an LED screen that displays the set temperature and current temperature at the same time, making your water temperature control simple and intuitive
Saranna SARANNA-01 Pool Heater For Above Ground Pool 15Kw 220V






- Visual display - Upgraded 11KW Above Ground Pool Heater with a touch screen display, allowing for more accurate visualization and control of the temperature. You can adjust the water temperature to suit different weather conditions.
- Energy-saving water heater - 316 stainless steel electric heating tubes have strong resistance to dry burning and corrosion, which improves service life. They also provide efficient heat conduction to accelerate heating time and reduce energy costs.
- AUTOMATIC CIRCULATION HEATING - The above ground pool heaters cycles on and off at preset temperatures, you can set your own temperature and when the water temperature reaches or exceeds the preset level, the pool thermostat will automatically switch off. Conversely, if the water temperature falls below the preset level, the pool thermostat will automatically switch on againch
- Professional Wiring Methods - As the hot tub heater is a high power machine, we will include an English installation and instruction manual, in order to ensure the safety of use, please follow the instructions or find a licensed professional electrician to install the.
- High-quality after-sales service - we provide 7/24 round-the-clock after-sales service, if you have any problems in the use of the process, please contact us in a timely manner, we will contact you within 24 hours to solve the problem for you!
Solar Sun Rings SSR-SB-02 60 Inch Above Ground Or Inground Swimming Pool Hot Tub Spa Heating Accessory Circular Heater Solar Cover









- Solar Sun Ring is composed of two sheets of vinyl that resist UV and convert solar energy into heat, adding free heat to your pool with only the power of the sun
- Solar blanket cover retains heat at night and reduces evaporation of water and chemicals is compatible with automatic pool cleaners and is not affected by salt or chlorine systems
- Water anchors add stability and weight for storms and windy conditions while the ease of cleaning and storage ensures hassle-free maintenance, which is easy to inflate
- Store pool solar cover away from direct sunlight when not in the water so the item can withstand high-quality use for lasting time
- Blue circular solar pool heater covers 50 square feet of surface area; Measures 60 inches long, 60 inches wide, and 2 inches tall and weighs 2.5 pounds
Intex ACE - 28685E 47 Inch X 47 Inch Solar Pool Water Heater Mat









- Solar heater mat uses solar technology to increase the temperature of the pool water by approximately 5 to 9 degrees depending on the weather
- Features an 11-square-foot surface to absorb the sun's rays to heat up above-ground pools; Dimensions (L x W) - 47.25 x 47.25 inches (flat)
- Simple and economical to use, compatible with filter pumps with up to 1/3 HP or a pump flow rate less than 2,000 GPH; Weight - 6.41 pounds
- Includes a 1.25-inch hose attachment point, a bypass valve, 1 adaptor A, and 1 adaptor B for a 1.50-inch hose connection
- Constructed of heavy-duty UV stabilized PVC; Suitable for above-ground pools up to 8000 gallons; Folds for compact winter storage
Xtremepowerus 75219-1 14,800Btu/Hr Pool Heater








- Ideal Choice for Above Ground Pools - Pool heat pump is specially designed for above ground pools. Can operate at outdoor temperatures of 40F to 105 F, while the swimming pool can be heated up to 100F (Depend local temperatures) Recommend Water Flow - 17GPM/1020GPH
- A Better Way to Extend Your Swim Season - Nothing beats a warm swimming pool for your kids and the whole family! What youll need is a highly efficient, low operating cost heating system an XtremepowerUS pool heat pump for your pool to extend the fun for a few more months!
- Economic Operating - Absorbing energy from the air to heat the pool is the working principle behind the heat pumps. With energy efficiency reaching COP 5.5, its operating cost is only 1/5 of electric or gas heating systems
- Easy and Simple to Install - The heat pump pool heater allowing fast & easy hookup without professional installation. Just hook up several quick connectors, then plug and play. No need professional tools. No need a plumber!!
- Powerful Compressor - The pool heat pump equipped with powerful compressor, outputs a capacity of 14800BTU/hr. The pure titanium heat exchanger can resist any corrosion from pool water. Intelligent control system maintains the pool temperature at a consistent level. Once it starts operating, you dont need to adjust any settings, just enjoy a warm and heated swimming pool!
Grillme SLX1-3000W 240V 3000W Immersion Bathtub And Swimming Pool Water Heater,Fully Submersible Portable Electric Heater,30 Galons Bathtub Heater,200 Galons Swimming Pool Heater,Nema 6-15P Plug,100% Waterproof








- Product Parameters - 240V 3000W (Must Use NEMA 6-15P 15A Outlet, This Heater is 12.5A Current) , Heater Length 13.5 Inches, Power Cord Length 118 Inches.
- Fast Heating - The 3000W Heater Can Increase The Water Temperature Of A 30 Gallons Bathtub By 50 Degrees Fahrenheit Within 30 MinutesMake Sure You Have A NEMA 6-15P 15A Outlet In Your Home.
- High Quality Material - The Shell Of The Heater Is Made Of Stainless Steel 316L Material, Which Has Better High-temperature And Corrosion Resistance Than Stainless Steel 304. The Anti Scalding Sheath Of The Heater Can Avoid Damaging The Container During Use.
- Notice - The Heater Needs To Be Completely Submerged In Water During The Heating Process To Avoid Dry Burning Damage. This Product Is Only Suitable For Heating Tap Water And Is Not Suitable For Heating Corrosive Liquids Such As Well Water,Seawater, Acids, Alkalis, etc.If There Is Scale On The Surface Of The Heater, It Should Be Regularly Removed With A Scale Remover Or Vinegar.
- Warranty - This Product Provides A One-year Warranty, And Is Free To Return Or Exchange If Damaged During Normal Use.
Aukitey 006 Immersion Water Heater, 2000W Bucket Heater With Switch Control, Portable Pool Heater







- Water Heating Faster - This 2000W big power water heater can quickly heat 5 gallons of water up to 167F in a few minutes. The SWITCH IS A CLEVER DESIGN! You can turn on or off the switch to control the heater work at will. (Do not touch water with hands when heating, use the thermometer to check water temperature, included in package ).This water heater can quickly help you get warm water.
- Premium & Safe - This UL Certified bathtub heater has 304 stainless-steel guard, safe and anti-rust protection, effectively preventing burns. We provide a free thermometer in package box, please use thermometer to check the water temperature, do not touch water with hands when heating. The detail operation process below.
- Easy Operation -1 - Put this pool heater into the water completely. 2 - Connect the plug, then turn on switch to run the water heater. 3 - During the heating process, check the water temperature with the digital LCD thermometer but do not touch water with hands. 4 - When finish heating, turn off switch, pull the plug, then take it out. Do not touch water and stainless-steel guard with hands during all process!
- Portable & Wide Application - This is a portable pool heater, easy to carry and convenient for indoor and outdoor. Perfect for used in bathtub, inflatable swimming pool, buckets, also used as outdoor camping, traveling, pet bath, car wash, etc..Let you do not wait for warm water for a long time any more!
- Warm Tips - 1-Do not touch the water with hands when heating. 2-Put this heater into the water completely before power on 3-After finish heating, firstly turn off switch, then take it out and do not touch heater surface. 4-Please do not plug 2 heaters on the same outlet. 5-If you need to use extension cord, better use 14 or 12 gauge. DO NOT USE 16 gauge extension cord! 6-Avoid of use by children 7-If you encounter any problems during use of the product, please refer to the instruction manual.
Hayward W3HP21404T Pool Heater, 140,000 Btu



- The Hayward HeatPro 140,000 BTU Heat Pump quietly and economically maintains ideal water temperature at all times
- Ultra Gold corrosion-resistant evaporator fin offers unparalleled durability, even in harsh coastal environments
- Titanium counter-flow heat exchanger ensures maximum heat transfer and provides excellent salt water and chemical corrosion resistance
- Profiled fan blade and heavy-duty scroll compressors ensure efficient air flow with minimal noise, making any backyard environment instantly more relaxing
- Injection-molded UV-resistant body panels are impervious to corrosion and deterioration
Villastar YC-005-FNEW Swim Pool Heater, Pool Heater







- ENJOY LONGER USE - There's nothing better than a warm pool for your loved ones, children, pets, and the whole family! Villastar Pool heater YC-005, high efficiency, energy saving, low operating costs, extended months of fun! It's your perfect heat pump solution!
- SAVE MONEY AND HIGH EFFICIENCY - Villastar pool heat pump has been carefully designed to be the most energy efficient in its class. Only a very limited power input is required for operation, so its thermal conversion rate can reach a score of COP 4.45. In other words, for every penny of electricity consumed, 4.45 times more heat is generated! So you won't waste a dime, and you won't have to worry about electric bills while your family enjoys swimming.
- IDEAL MULTI-PURPOSE POOL HEAT PUMP - This electric pool heater is suitable for small above-ground pools up to 5,000 gallons and underground pools up to 4,000 gallons (suitable for rectangles between 5 x 10 ft and 11 x 22 ft). The device can operate at outdoor temperatures ranging from 23F to 109.4F, while the pool can be heated to 104F.
- EASY OPERATION - Pool heater YC-005 can be connected quickly and easily without professional installation. Multiple installation options are available, 1.2 "/32mm water pipe connection, quick and easy ground, no plumber required. Setting the water temperature is displayed on the LED display, and the control setting is simple and fast.
- RUGGED DESIGN - Villastar pool heaters are designed with galvanized steel, which does not rust or deteriorate. The YC-005 Pool heat pump is equipped with a high-power compressor with an output power of 16,036 BTU/hr. Pure titanium heat exchanger for water. An intelligent control system, easy to operate.
Raypak 014779 Pr106Aenc 105000 Btu Natural Gas Pool Heater

- Polymer headers prevent rust stains on your pool or spa surface
- All-Copper-Fin-Tube Heat Exchanger; Made from a single piece of extruded copper
- Delivers uninterrupted heating performance regardless of falling leaves, wind, airborne debris, rain, downdrafts, updrafts, sleet, snow, etc
- Doesn't require fans to combat drafting problems
Gofloats GF-SOLAR-V2-60-3 Inflatable Solar Pool Heaters






- NEW UPGRADED DESIGN - Rings inflate faster & lay perfectly flat every time; Heaters trap the sun's energy to heat your pool during the day and keep it insulated at night; ; Use multiple heaters to cover at least 80% of your pool's surface for best results
- SAVE ON HEATING - Includes 3 inflatable heaters; Compliments existing gas and electric heaters to save you time with faster heating
- MINIMALISTIC DESIGN - These heaters lie completely flat, the solid blue color provides a clean, modern look to any backyard pool
- RECOMMENDED AMOUNT - Each one is 5 ft x 5 ft and covers 25 square feet of your pool surface; To roughly calculate the number of rings for 80% coverage, take your pool's sq. ft. surface area and divide by 30
- GREATER COVERAGE - The thick outer perimeter of these heaters minimize potential overlapping and increase pool surface coverage
Treela 2 Pcs Immersion Water Heater Pool Heater For Above Ground Portable Electric Heater Submersible Hot Tub Heater With 304 Ss Bathtub Bucket Basin Pool Heat 5 Gallon Water In Minutes






- Heat Fast - there are 2 pieces of the electric pool heaters, they have porous surface made of 304 stainless steel, with the high power, so that they feature the reliable thermal conductivity, and can help you quickly up heat 5 gallons of water in minutes, bringing you an enjoyable using experience
- Dependable and Safe - designed with reliable automatic power off function, the bath tub heater for bath can automatically turn off when the water getting 120 to160 degrees Fahrenheit, which relieves you from worries about fire in some way, and allows you to use it with confidence; When heating the inflatable pool, please avoid the contact of the heater with the inflatable pool to prevent damage
- Simple to Apply - place the pool water heater in a container, then fill the container with water to completely cover the heater, including the stainless steel shroud and plastic parts, and plug the heater into a properly grounded 120V alternating current outlet, turn on the heater, and wait for the heating to finish
- Extensive Applications - the immersion water heater is suitable for containers in various sizes, like portable bathtubs, pond, sink, bucket, mini inflatable swimming pools; Please make sure that your container is designed to hold boiling water; And it is ideal for activities, like washing your car in winter, heating water for farm animals and more. Not recommended for use in large pools. If using an extension cord, check the maximum power usage of the extension cord.
- Kind Notice - when working, the portable hot water heater, should be completely submerged in water; Please do not continuously use it for more than 3 hours; To avoid scalding and electric shock, keep away from boiling water during the heating process, and unplug it before touching water ; Furthermore, if your bathtub or small swimming pool has a large capacity and requires more than 2 heaters to be heated at the same time, please do not plug 2 heaters into the same outlet to avoid a fire
Fibropool FH 135 Swimming Pool Heat Pump - Fh135 35,000 Btu - For Above And In Ground Pools And Spas - High Efficiency, All Electric Heater







- CLEAN AND GREEN - The FH135 is powered by clean electricity, reducing the harmful environmental effects and cost of traditional heaters that use natural gas or propane. Our pumps instead move heat from the air into the water, which saves you money and is a breeze to maintain
- COMPATIBLE WITH - In ground pools up to 7,500 gallons and above ground pools up to 18 foot round or 12 by 24 foot oval. As with all heat pumps, we recommend using in a humid climate down to 50 degrees for best performance. Dry climates are better served by a traditional gas heater
- HIGH EFFICIENCY - Utilizing high-pressure differential compressors and titanium heat exchangers, FibroPool heat pumps are meticulously designed to be the most energy efficient in their class. You can rest comfortably knowing your family will enjoy years of late season swimming without feeling a squeeze on your electric bill
- RUGGED DESIGN - Enamel-coated steel chassis is designed to withstand outdoor elements season after season. Slim profile measures just 16"x40"x24", offering a wide range of mounting options. Conveniently installs with included 1 1/2 inch compression fittings
- EASY OPERATION - Digital control panel with an easy-to-read display offers convenient temperature setting and monitoring. Optional extension cable allows you to mount the control panel in a location that works best for you
Jniceantai HEATER001 1800W Immersion Water Heater For Pool







- Versatile Heating Solution - Our immersion water heater is perfect for a variety of applications, including as a pool heater for above ground pools, above ground pool heater, and small pool heater. Whether you're looking for pool warmers for above ground pools or a portable pool heater, this device offers efficient and reliable heating. Ideal for inflatable pool heater needs, it works seamlessly as a pool water heater, pool heater for inflatable pool, and stock tank pool heater. Enjoy a warm swimming experience with this heater for pool above ground and water heater for pool for above ground pool.
- Rapid and Long-Lasting Heating - Our immersion water heater delivers efficient and reliable performance, capable of continuously heating for up to 3 hours. It quickly warms up 6 gallons water just a few minutes, making it perfect as a pool heater for above ground pool, small pool heater, or pool warmer. Whether you're using it as a portable pool heater, inflatable pool heater, or water heater for pool for above ground pool, this heater for pool ensures your swimming pool heaters and pool water heater needs are met swiftly and effectively.
- Safe and Durable Heating - Our immersion water heater is designed with safety and durability in mind. Made from high-quality 304 stainless steel, this pool heater for above ground pool provides long-lasting performance and resistance to rust. The ETL certified plug ensures safe operation, while the CE certified thermostat with easy-to-use controls offers precise temperature management. Ideal as a pool water heater, small pool heater, or inflatable pool heater, it ensures a safe and enjoyable swimming experience. Enhance your pool with this reliable heater for pool.
- WARNING - People and animals should not come in contact with water while the immersion water heater is operating. When using the portable pool heater or any heater for pool, first place the water heater for inflatable pool or stock tank pool heater in the water, making sure it is completely submerged, then plug it into an outlet. Determine the order of operation; do not expose part of the immersion water heater for pool to the air, and avoid plugging two water heater for pool for above ground pool into the same outlet, as this may cause a fire. This appliance is not intended for use within 3 FT of any building, flammable material, or other gas cylinders that increase the risk of fire.
- Exceptional Safety and Performance - Discover the ultimate in pool heating with our immersion water heater. Crafted from robust 304 stainless steel, this pool heater for above ground pool is built to last and resist corrosion. Featuring an ETL certified plug and a CE certified thermostat with user-friendly buttons, it ensures a safe and precise heating experience. Whether you're using it as a small pool heater, portable pool heater, or pool water heater for above ground pool, this heater for pool delivers consistent warmth for your inflatable pool heater or stock tank pool heater needs. Upgrade your pool setup with this reliable and safe swimming pool heater.