To "stop" an annoying boiler drip at the pressure temperature relief valve, the mechanic installed a short length of pipe capped by a drain valve which he could simply shut. Only a complete fool would do what we found on this boiler. The purpose of this drain line is to discharge potentially hot scalding water to a safe location so that a bystander is not scalded.Īt left we see a typical TPR valve installation (by the author) including the vertical 3/4" copper drain piping that will discharge any T&P valve spillage to the floor.Īn unsafe TPR drain line installation is shown at the top of this page. The Temperature & Pressure Relief Valve or TPR Valve on any heated appliance that contains water, such as a heating boiler, hot water tank, water heater, water cylinder, must have a drain line or discharge tube properly installed, routed, and made of proper materials. Temperature/Pressure Relief Valve Discharge Tubes & Drain Lines & Their Piping We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. Here we describe the installation specifications for TPR valve drain line piping and we include an extensive list of discharge tube installation or condition defects, most of which are unsafe. These include hydronic heating boilers (hot water boilers), steam boilers, and all types of water heaters, both those that use a water storage tank or cylinder and those that heat water on demand such as tankless water heaters. This article describes the requirements for a discharge tube or drain line on temperature & pressure relief valves used on any appliance that heats water.
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