With this innovative dual action heater we provide you with the possibility to heat the water using the electric heating element or by exchanging heat from another hot water source. It can also operate in a combination of both thus significantly increasing performance. Use the power source you prefer and add the other when you need it. It is equipped with a flow sensor to protect against a lack of sufficient flow, a safety thermostat at 55°C and a high resistance anti-corrosion Incoloy 800 heating element. It is easily and simply installed in the circuit with a glued standby for Φ50. Designed to save space and is also ideal for hot tubs, aquariums, and other small applications. The durability of the system can be increased considerably if the safety and installation instructions are followed.