Feature: 1. The product is small in size and easy to install in the circulation massage pipe at the bottom of the bathtub. 2. Easy to operate, it provides a mechanical temperature control switch, you can set the temperature according to your use of temperature technology. 3. Equipped with water flow switch and ultra-high temperature protection switch, it is safe and reliable when operating. 4. Heating thermostat liner material is 316# stainless steel and electric heat pipe, corrosion resistance (chlorine corrosion), durable. 5. The liner of the thermostat has good circulation, no slag hanging, and is easy to disassemble. 6. When adding hot water bath, start the pump, the thermostat automatically heat insulation work, so the water temperature bath maintained between at 30-40℃ adjustable, give your massage bathtub to create a more comfortable environment. Specification: Condition: 100% Brand New Item Type: Swimming Pool Heater Material: Stainless Steel Color: As shown in the picture Size: Approx.260x122x125mm / 10.2x4.8x4.9in Power: 3 KW Weight: Approx.2200g/77.6oz Product Information Description:1. This one needs to be equipped with a water pump to be able to circulate heating, generally 0.75-1HP can be used. 2. The pressure switch cannot be turned on until the water pressure is reached, and the machine will work; if the light is off, the water pressure is not enough and the pressure switch cannot be turned on. Package List: 1 x Swimming Pool Heater1 x Instruction Manual2 x Interface Note: 1. Please allow 1‑2cm error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.3.Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.