Boiler or nearby piping emits a whistling or high-pitched noise during firing

Safety first: Use hearing protection if noise is loud; avoid contact with hot surfaces.

Steps:

• Check valves: Verify all isolation and balancing valves near the Peerless boiler are fully open unless intentionally throttled.
• Clean strainers: Isolate and clean any Y-strainers or dirt separators.
• Adjust pump speed: If using a multi-speed circulator, try a lower speed to reduce noise.
• Consult design: Persistent whistling may indicate undersized piping requiring professional evaluation.