What is the minimum service clearance required in front of a boiler?

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Having enough space to service the boiler is essential for safe, effective maintenance. The minimum front clearance should be 48 inches. This four-foot space lets you open any service door or access panel fully, reach controls and valves without squeezing, and move around to inspect the burner, vent connections, and piping. It also provides room to maneuver tools and, if needed, pull the unit away from the wall for work. While manufacturers or local codes may demand more clearance in certain installations, 48 inches is the standard minimum to ensure a safe and workable service area.