§ Chapter 20 IRC 2024
Boilers and Water Heaters
6 entries from Chapter 20 of IRC 2024, organized by section number. Each entry covers what the code requires, why it exists, what inspectors look for, and common mistakes.
§ 01 Sections
All 6 entries.
Sorted by section number. Click any row for the full entry — answer, requirements, edition diff, related sections.
Section
Title
Question
M2001
IRC 2024 Boiler Installation Requirements: ASME Stamping, Clearances, and Safety Controls
M2001
What does IRC 2024 require for residential boiler installation, including ASME stamping, clearances, operating controls, and mounting?
What does IRC 2024 require for residential boiler installation, including ASME stamping, clearances, operating controls, and mounting?
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M2001
IRC 2024 Water Heater vs. Boiler: Code Classifications, Combi-Systems, and Dual-Use Concerns
M2001
What is the difference between a water heater and a boiler under IRC 2024, and how are combi-boilers that provide both domestic hot water and space heating classified and regulated?
What is the difference between a water heater and a boiler under IRC 2024, and how are combi-boilers that provide both domestic hot water and space heating classified and regulated?
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M2002
IRC 2024 Boiler Pressure Relief Valve Requirements: 30 PSI, Discharge Piping, and ASME Stamping
M2002
What does IRC 2024 require for a pressure relief valve on a residential hot water boiler, including discharge piping, shutoff prohibition, and testing?
What does IRC 2024 require for a pressure relief valve on a residential hot water boiler, including discharge piping, shutoff prohibition, and testing?
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M2003
IRC 2024 Expansion Tank Requirements for Hydronic Boiler Systems
M2003
What does IRC 2024 require for expansion tanks on closed-loop hydronic heating systems, including type, pre-charge pressure, and location?
What does IRC 2024 require for expansion tanks on closed-loop hydronic heating systems, including type, pre-charge pressure, and location?
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M2003
IRC 2024 Hydronic Expansion Tank Sizing: Formulas, Bladder vs. Steel, and When to Add a Second Tank
M2003
How do you size a hydronic expansion tank under IRC 2024, including the acceptance factor formula, bladder vs. compression tank differences, and when a second tank is needed?
How do you size a hydronic expansion tank under IRC 2024, including the acceptance factor formula, bladder vs. compression tank differences, and when a second tank is needed?
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M2004
IRC 2024 Hydronic Heating Controls: Aquastat, Zone Valves, and Outdoor Reset Requirements
M2004
What does IRC 2024 require for hydronic system controls including aquastat, zone valves, circulator relays, and outdoor reset control on larger boilers?
What does IRC 2024 require for hydronic system controls including aquastat, zone valves, circulator relays, and outdoor reset control on larger boilers?
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§ 02 Chapter navigation