IRC 2021 · Model

Chapter 28: Elevators

19 sections in this chapter of the IRC 2021 model text — not Model's amended edition.

2804.3 Pressure relief valves Pressure relief valves shall have a relief rating adequate to meet the pressure conditions for the appliances or equipment protected. In tanks, they shall be installed directly into a tank tapping or in a water line close to the tank. They shall be set to open at not less than 25 psi (172 kPa) above the system pressure and not greater than 150 psi (1034 kPa). The relief-valve setting shall not exceed the rated working pressure of the tank.

Plain-English guides for this chapter

Water Heater Installation — IRC P2804.3, P2804.4, IRC P2804.6
Thermal Expansion Control — IRC P2903.4, IRC P2903.4.2
Tankless Water Heaters — IRC G2413, Table G2413.4(1), IRC G2427.4; mfr instructions

2804.3Pressure relief valves
2804.4Temperature relief valves
G2445.1Unvented Room Heaters
G2446.1Vented Room Heaters
G2448.1(624.1) General
G2450.1(628.1) General
G2452.1(631.1) Standards
P2801.1Required
P2801.2Drain valves
P2801.3Installation
P2801.4Location
P2801.5Prohibited locations
P2801.6Required pan
P2801.7Water heaters installed in garages
P2802.1Water temperature control
P2803.1Protection of potable water
P2803.2Temperature control
P2804.1Relief valves required
P2804.2Rating

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