1.element design,fast heating, 2.remote control,energy saving, 3.temperature displayer, 4.used for room heating and hot water Model JLG18JLG20JLG24JLG30JLG40Rated heat inputkW1820243040Heating efficiency ... controllern is compatible to various architecture heating and ventilation system including radiators, floor heating, fan coil wall mounted gas combination boilers for heating and hot water