Water heaters are one of the hardest-working appliances in a home. Yet, one of their most important safety components is often overlooked — the Temperature and Pressure Relief Valve , commonly called a TPR valve or TPRV . Understanding what a TPR valve does and why it matters can help Las Vegas homeowners avoid serious safety hazards and costly damage. What Is a Water Heater TPR Valve? A TPR valve is a safety device installed on water-heating appliances such as: Domestic wa