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The minimum size of a blow-off pipe for miniature boilers is specified to ensure proper drainage and the safe operation of the boiler. A 1/2 inch diameter for the blow-off pipe is adequate for miniature boilers due to their size and operational characteristics. This dimension allows for the effective discharge of sediment and sludge from the boiler system, which is crucial for maintaining boiler efficiency and safety.

Smaller pipes may not facilitate adequate drainage, potentially leading to sediment buildup and operational issues, while larger pipe sizes could unnecessarily complicate the system or take up more space than necessary for a miniature setup. Therefore, the choice of 1/2 inch is both practical and aligned with safety standards for miniature boilers.