IRC 2021 · Model
Chapter 28: Water Heaters
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.
- 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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