Why is my LPG tank hissing in hot weather?
Written by Sanjit Sandhu
Updated at July 3rd, 2026
During very hot weather, the pressure inside your LPG tank can increase. Your tank is fitted with a Pressure Relief Valve (PRV), which is designed to automatically release pressure if it rises above safe operating limits.
If the PRV activates, you may hear a hissing sound or notice gas vapour being released. This is the safety system working as intended to protect the tank and it's surroundings.
View our additional support page on Extreme Hot Weather & Your Calor Tank(s).