The 10 best 110v hot tub heaters of 2025

Requires a 20A circuit(Connect 20A adapter or breaker),with 1.5" outlet , min 0.35MPA pressure,suggest work with at least 0.25HP,suitable small bathtub & spa tub /hot tub 2 KW /110V-120V.No plug, just 3 cables,Black Cable is Live,White Cable is Neutral,Green Cable is Grounded.

We suggest water capacity not more than 400 US gallon,the heater won't work if it exceeds the standard, see the picture 2.

We suggest the pump not less than 200 wat (3600 L/ h), small pump will cause the heater cannot work,see the picture 3.

Make sure the mount direction is correct,arrow direction is the water flow direction,wrong direction will not make the heater work. see the picture 4.

A quick method for detecting heating pipe damage,see the picture 5.

When the heater doesn't work,use a multimeter to test the 4 points to determine which component is damaged,see the picture 6.

If have any issues with heater,please take some photo of the using environment,including installation direction,set temperature,pump and water capacity,we will help you troubleshoot.

[Constant Temperature Control]: Use the temperature knob to set and maintain the desired water temperature from 0 to 45°C. Once the desired temperature is set, the thermostat continuously monitors and adjusts the operation of the heating system to maintain the water at a constant temperature.

[Connect with Circulation Pump]: Spa heater have to connected with circulation pump with power of more than 0.5HP. Smaller pumps may not provide enough water flow to activate the heater. Also, the spa thermostat has to be with a circulation pump rather than a booster pump or submersible pump.

[1.5" PVC plumbing]: Mxmoonant hot tub heater is equipped with 1.5" PVC pipe fittings, so you should use SCH 40 1.5" PVC pipe for the plumbing connection. A smaller size may result in insufficient water flow. If you want to use other pipe sizes, please note that everything should start with 1.5".

[Tips for Heating]: It's recommended to fill the hot tub with hot water instead of cold water, as cold water can impact the heating performance. Additionally, it's advisable to limit the water capacity to no more than 400 US gallons and to use an insulation cover to retain the temperature. Otherwise, it may take a long time or may not heat up at all.

[No Plug]: The pool thermostat does not come with a plug as it is a high power device. It should be connected to a 20A GFCI circuit breaker. It is recommended that you find a professional electrician to complete the circuit connection.

Stainless Steel 7.0" x 1.5" in-line heater; 1.5kw 110V Incoloy heater element; Built-in pressure or vacuum switch to activate heating

Automatic smart thermostat (104 degrees F limit); Reversible mounting; Heater on light; Hi-limit protection

1.5" and 1.0" pipe fittings included; Pair of 1.5" Heater O-Ring Gaskets included; 110V 60Hz 3ft NEMA cord

Copper bonding wire included; installation and operation manuall

2-year limited warranty; UL Recognized for safety standards

Advanced Safety Features with Auto Shutoff & Durable Materials: This immersion water heater ensures reliable operation and is designed with multiple safety protections, including automatic shutoff and dry burn prevention. The high-quality stainless steel heating rods and reinforced 14-gauge power cord resist overheating, corrosion, and electrical risks. Each unit undergoes strict testing to meet high safety and durability standards, making it a dependable choice for household and farm use

Smart Temperature Control with Auto Heating and Shutoff: This immersion water heater allows users to set a preferred water temperature with an adjustable thermostat. By default, it heats up to 175°F (79°C), but you can adjust it to a lower setting, such as 120°F. Once the water reaches the target temperature, it automatically shuts off and restarts heating when it drops 15°F below, helping to maintain a steady and comfortable temperature

1800W Efficient Heating for Bathtubs, Hot Tubs, and More: The 1800W heating element gradually warms water based on volume and initial temperature. Ideal for bathtubs, hot tubs, buckets, pools, farm tanks, and other heating needs, this unit is suitable for home, garage, basement, and farm applications. Whether used as a hot tub heater, bucket heater, or emergency water heater, it delivers consistent heating performance

Real-Time Temperature Display for Easy Monitoring: The built-in LED display shows the current water temperature for easy monitoring. Due to sensor placement, the displayed temperature may be approximately 5°F higher than the actual water temperature. This helps users gauge water conditions for household, winter heating, and farm applications

Heavy Duty Stainless Steel Build for Long-Term Use: Constructed with high-grade stainless steel heating rods, this immersion heater is corrosion-resistant and durable. The reinforced power cord enhances electrical safety and ensures stable power delivery. This unit is designed for long-lasting performance and is suitable for buckets, tubs, livestock tanks, and portable pools

1.5" PVC Plumbing Standard]: The heater includes 1.5" SCH40 PVC fittings. Ensure all plumbing connections match this diameter for optimal flow. Important: If adapting pipe sizes, the heater’s inlet/outlet must remain 1.5"—reducing pipe diameter elsewhere may compromise water circulation efficiency.

[Circulation Pump Requirements]: Spa heater must be paired with a circulation pump rated ≥0.5HP (booster pumps or submersible pumps are incompatible). Note: Pumps below 0.5HP may fail to activate the heater due to inadequate water pressure. Always verify pump specifications before installation.

[Constant temp control]: Set and maintain the desired water temperature from 0 to 45°C using the temperature knob. The hot tub thermostat continuously monitors and adjusts the operation of the heater to maintain the water at a constant temperature once the desired temperature is set.

[Heating Tips]: For faster heating, fill the tub with hot water instead of cold, keep the water volume under 400 gallons, and use an insulation cover to maintain temperature. Starting with cold water or exceeding the capacity may result in slow heating or failure.

[No Plug Supplied]: As the pool thermostat is a high power device, it is not supplied with a plug. It should be connected to a 20 amp GFCI circuit breaker. We recommend using a professional electrician to connect the circuit.

Note:Since pool heat pumps are machines that utilize electric heat technology, please email or call us if you encounter any problems (e.g., no heating )..Suitable for pools up to 2000 gallons in coastal climates Fit 8/11 Foot Pool.the temperature ranged from 40 °F-122 °F (5 °C-50 °C).Material: Metal;Voltage: 110V/50-60Hz;Power: 3KW;Phase Parameters: Single Phase;NOTE:One interface is 50mm, the other port is 32mm, please note the size of the pipe before use.

A Better Way to Extend Your Swim Season(For A Whole Year): Nothing beats a warm swimming pool for your kids, pets and the whole family! What you’ll need is a highly efficient, low operating cost heating system – an AYCHLG pool heat pump for your pool to extend the fun for a few more months!

Superb Energy Saver:The pool heater is a heat pump specifically designed for swimming pools. The operation only requires very limited electric input, hence its high efficiency and heat conversion rate can reach a score of COP 84.2.

It is easy to operate and provides a mechanical fit for the thermostat switch to set the temperature of the temperature technology. It is also equipped with an automatic reset function, unlike others which have to be reset manually.

The product is small, suitable for: hot tub & swimming pool equipment and it is easy to install in the bathtub at the bottom of the circulating massage pipe

Stainless steel 7.0" x 1.5" T-style heater; 1.5kw Incoloy heater element

Built-in pressure switch to activate heating; Automatic smart thermostat (104 degrees F limit)

Reversible mounting; Heater on light; Hi-limit protection

Includes 1.5", 1.0" and 3/4" fittings; 110V 3ft NEMA cord; Complete Installation Instructions

2 year limited WARRANTY; UL Recognized for safety standards

【Hot Tub Heater Element】 This heater assembly is compatible with Balboa VS, EL, TS, GS and BP Series control systems. Replace Balboa Part Number 58117.

【Universal Compatibility】 A must-have item to replace for varieties of models, such as 58104, 58120, 55033-01, 58106, 58117, 55033-02, 58056, 58109, 55035-01, 55035, 58064, C2400-0807-TPS, 58120, 58148, 26-0540-5S-KS, 58032, 58281, 58114, 55033, 55625, G7410, 53408. Please refer to description below for searching more compatible models.

【Important Specification】 Heater Length: 15", Heater Diameter: 2". This heater assembly can be used under 4.0kW 240V or 1.0kW 110V-120V rating. You can directly take it for use as long as your system meets the standards.

【Quick & Easy Installation】 Package includes 1 heater element, 1 pair of 2. 0" heater split nuts, 1 pair of 2. 0" heater tailpieces with o-ring gaskets. Finish the installation easily and smoothly.

【Qualified & Premium Heater Assembly】 The heater housing is precisely machined from fully heat treated alloy steel. Higher strength, better corrosion resistance and impact resistance. Ensure reliable and long-lasting durability.

【Satisfaction Guarantee】 If you're not satisfied with the product, simply return it in 30 days or get a replacement within 1 year for quality-related issues via our customer service. If your item is defective, incorrect, arrived damaged or any other problems, please contact us (include pictures if possible) and we will reply in 24 hours.

This multi-functional water heater Perfect for above ground pools, inground pools, inflatable pool heaters, hot tubs, stock tank heaters, and foot pool heaters, it ensures that you can enjoy warm water in different settings. Whether you need a swimming pool heater for your backyard pool, a livestock pool & water trough heater for your farm, or a baptistry & baptismal pool heater for your church, this heater has got you covered. Designed to work efficiently in diverse environments, it’s ideal for use in farms, eco-ponds, ranches, barns, duck pools, outdoor artificial waterfall ponds, campgrounds, RV parks, bathrooms, and outdoor swimming pools. It delivers fast, reliable heating.

Portable pool heater is designed with a compact size & portable. Its compact size makes it an excellent choice for bath heaters in tight spaces like bathrooms or for outdoor use like baptistry & baptismal pool heaters. The portable nature of this product ensures that you can easily move it from your above ground pool on outdoor adventures. With its compact size, you get all the benefits of a high-performance swimming pool heater in a convenient, portable package. Whether you are looking to warm up your swimming pool, hot tub, or provide heating for your livestock pool & water trough, this compact and portable immersion water heater delivers reliable performance without taking up space.

Pool heater is designed with advanced GFCI (Ground Fault Circuit Interrupter) protection to ensure safety in various settings. When as a hot tub heater, bath heater, or a baptistry & baptismal pool heater, the GFCI feature protects against electrical leakage, preventing potential hazards. This immersion water heater provides reliable heating while safeguarding against overloads and electrical faults, GFCI protection will automatically cut off power in case of a fault, ensuring peace of mind for you and your family. Its smart design means that it will continuously monitor electrical flow, preventing any unsafe situations in your swimming pool heater or pool heaters for above ground pool.

immersion water heater features a high-quality 304 stainless steel seamless tube, That only provides rapid heat distribution but also resists rust and corrosion, making it the perfect choice for both pool heaters for above ground pool and pond water heater for fish applications, Unlike traditional heating elements, allowing it to heat water twice as fast as standard immersion water heaters,304 stainless steel construction ensures long-lasting performance and faster, more efficient heating. The seamless construction also minimizes the risk of leakage, offering a safe and reliable solution for your above ground pool or bath heater needs.

pool heater comes equipped with a highly accurate thermostat, offering precise temperature control within a ±32℉ range, ensuring you can easily maintain the perfect water temperature for various applications. With a control range of 44-212℉, Its precise temperature control allows for energy-efficient heating while preventing overheating, making it an ideal solution for homes, farms, and outdoor environments. for bath heater and hot tub heater can provide customized heating for your baptistry & baptismal pool heater, pool heaters for above ground pool, pond water heater for fish. maintain optimal livestock drinking water or swimming pool temperatures.

【Important Safety Instructions】or safe use, do not heat the device in the air, as the heating rod can reach temperatures up to 392℉ in 10 seconds, potentially causing damage. Avoid touching the heater while it’s powered on to prevent burns or electrical hazards. Never plug multiple heaters into the same power strip to avoid overloading the circuit. Ensure your home’s power supply is compatible with the heater’s requirements to prevent safety risks. Additionally, maintain a minimum distance of 1 meter from flammable materials while in use to reduce the risk of fire.

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 0.1°C, 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