How many spare sprinkler heads are required on hand for a system with 1-300 heads?

• A. 4
• B. 6
• C. 8
• D. 10

Answer: (B)

Having spare sprinkler heads on site is about readiness and matching the system’s protection. For a system with up to 300 heads, the standard calls for six spare sprinklers kept on hand. The idea is to have replacements immediately available if a head is damaged, removed for testing, or needs swapping during maintenance, without delaying work or risking a lapse in protection.

Keep the spares identical to what’s installed—same style, temperature rating, and model—so replacements perform exactly like the originals. Store them clean, dry, and in their packaging so they’re ready to install when needed. If the system is larger, more spares are kept in proportion to the head count according to the applicable standard.