Heatrae Sadia Megaflo HE Upper Immersion Heater Element is used to increase the water temperature within a cylinder. This water can then be used by the end user for radiators and domestic use. The element also enables the cylinder to hold its temperature, meaning the hot water will hold at the set temperature until it is given further instructions by the user. It is compatible with Electromax 180Ltr 6KW, Electromax U/F 180Ltr 9KW, Electromax 6kW 180L Underfloor ErP electric flow boiler, Megaflo CL145HE, Megaflo CL210HE, Megaflo DD170HE, Megaflo DD300HE, Megaflo DDD210HE, Megaflo DDD250HE, Megaflo Systemfit CL125HE, Megaflo Systemfit CL170HE and Megaflo Systemfit CL2 unvented heating elements.