Function: 1. The product is compact and easy to install in the circulating massage tube at the bottom of the bathtub. 2. Simple to operate, featuring a mechanical temperature control switch that allows temperature adjustment based on user preferences. 3. Equipped with a water flow switch and a high-temperature protection switch for safe and reliable operation. 4. The heating thermostat element is made of 316 stainless steel and an electric heating tube, offering excellent corrosion resistance, including resistance to chlorine corrosion, ensuring long-term durability. 5. The thermostat element provides efficient water circulation, prevents residue buildup, and is easy to disassemble for maintenance. 6. When adding hot water, activate the pump; the thermostat automatically heats and maintains insulation, keeping the bath water temperature within an adjustable range of 30–40°C, enhancing comfort in the massage tub. Item Type: Pool Heater Material: Stainless Steel Color: As shown in picture Size: Approximately 340 x 122 x 125 mm (13.4 x 4.8 x 4.9 inches) Power: 3 kW Weight: Approximately 2200 g (77.6 oz) Product Information: 1. This unit requires a water pump to enable heating circulation; a pump with 0.75–1 HP is generally suitable. 2. The pressure switch activates only when sufficient water pressure is achieved; if the light is off, water pressure may be insufficient, preventing the switch from turning on. Package List: 1 x Pool Heater 1 x User Manual 2 x Interface