Recommended for use as frost protection or as a supplementary source of heat in small water volumes and hot tubs under 1.000 l. The heater has a built-in flow switch circulation contact, which disconnects the water heater if water suddenly stops flowing. Suitable for use indoors and out. If used outdoors, the heater must be in a dry, covered place. If used outdoors, remember to insulate the water pump with a thermal cover. See reverse side for technical specifications and kW. Heating capacity; approximately 0.7°C/hour/1 m3 (measured with ambient temperature between +2°C -5°C and with the use of an isothermic cover on the water surface. The Spa heater is equipped with a simple adjustable thermostat with an interval of 0-45⁰C and flow switch. The flow switch ensures that the heater stops automatically when the water circulation stops from the system circulation pump. Supplied with 50 mm glue fittings and hose adaptors 32/38 mm. Heating effect: 2000 W. 10 Amp. 230V/50-60 HZ. The water heater must be installed by a qualified technician, who is specially trained to install hydrotherapy pools and tubs. Note: 1. This electric heater is a professional unit, which is delivered without plug on the cord. It is recommended that the installation be done by an authorized electrician. 2. The water heater has a built-in sensor and can only work when the pump is running and the water circulates through the heater at more than 3600 liters / hour. Specifications Effect; 2 kW Volt; AC 220-240 V, 50/60 Hz Amps; 10A Max pressure MPa; 0.035 Classification; IP45 Heating of 1000 L; +0,7 ºC per hour Under ideal conditions the spa heater can heat the spa water to 45 C