Feature: 1. Widely used in the circulation system of hot springs and hot tubs with pressure to keep and heat the water temperature. 2. Cold water can also be heated, mainly for heating and thermostatic functions, install heater in the position of the bottom level. 3. This thermostat has the characteristics of excellent performance, complete functions, practicality and easy operation. 4. The water heater will start to work after the bathtub is filled with water. It is specially designed for hot and cold bathtubs and suitable for bathtub SPA. 5. Our water massage equipment heater does not require any special maintenance or programming and is easy to use. Specification: Item Type: Bathtub Heater Material: Stainless Steel Color: As shown in the picture Product Size: Approx. 30x13.5x5.5cm / 11.8x5.3x2.2in 1 Pipe Connector Size: Thickness: Approx.4mm / 0.16in Height: Approx.4.4cm / 1.7in No Thread Outside Diameter: Approx.5.7cm / 2.2in 2 Pipe Connector Size: Thickness: Approx.3mm / 0.12in Height: Approx.4.4cm / 1.7in No Thread Outside Diameter: Approx.5.7cm / 2.2in Weight: Approx.1550g/54.7oz Model: H30-R1 Product Power: 3KW Working Voltage: AC220-240V Waterproof Rating: IPX5 Current: 13.6A Applicable Bathtub Water Capacity: 1280L Model: H20 - R1 Product Power: 2KW Working Voltage: AC220-240V, 50/60HZ Waterproof Rating: IPX5 Current: 9A Applicable Bathtub Water Capacity: 750L Purpose: Constant temperature heating Heater Type: Water heater Applicable Places: Massage bathtub, bathtub SPA. Installation Method: 1. The bathtub water heater should be connected to the tubing circulation system, and can also be connected to the inlet and outlet of the bathtub pump to ensure that the direction of water flow conforms to the instructions on the bathtub water heater. 1. The heater must be installed horizontally. 2. The heater can be installed with the inlet or outlet of the bathtub pump. (Note: Cannot be fixed by binding) 3. PVC pipe: cut a specific length of polyethylene from the pump outlet and connect to the nozzle. (Note: The size of the pipe joint should be the same as that of the bathtub pipe) 4. Pipe joints: clean the PVC pipe joints, and then use glue to connect the PVC pipe and joints together. (Note: installation distance between heater and pump) 5. Heater installation: Separate the connecting nut and connect the PVC pipe to the heater (Note: O-ring).