How many spare sprinkler heads are required on hand for a system with 301-1000 heads?

• A. 6
• B. 12
• C. 18
• D. 24

Answer: (B)

Having spare sprinkler heads on hand ensures you can replace a damaged or misfired head quickly without compromising protection. The number kept is linked to the total headcount in the system. For a system with 301 to 1000 heads, the standard calls for twelve spare sprinklers. This amount provides enough replacements to cover maintenance and potential failures across a mid-sized installation without overstocking. The spares should match the installed heads in type and temperature rating and be kept in their original packaging in a clean, accessible location so they’re ready for immediate use. For smaller systems you’d typically need fewer, while larger systems (1000 or more heads) would require more spares, such as twenty-four.