DIGITEN DC 12V 1/4" Inlet Feed Water Solenoid Valve Quick Connect N/C normally Closed DC 12V 1/4" Quick connect Solenoid valve. Turn on water when system start;and cut off water when system stop. Working pressure:0.02-0.8Mpa. Rated power:4.8W. It will become hot because there are so many coils inside. Its normal and safe phenomenon. The highest working temperature of this product reaches 60. If you want it works long hours, you should find a N/O normally open solenoid valve.