Specifications: Liner material: stainless steel Voltage: 220V (Transformer required) Power: 11KW Phase: single phase Connection size: 40 mm (1.57) Machine size: 49 x 10 x 38 cm / L x W x H. Suitable for: hot tub & swimming pool equipment Description: Intelligent temperature control, stable performance, safe and reliable Automatic constant temperature, can be set according to the required water temperature. The maximum set temperature is approx. Safe and reliable, mechanical pressure switch. When the pressure is below the set value, the power supply is automatically switched off. Do not heat sea water or salt water. Package include: 1 pool heater 1 English manual.