ASME Boiler and Pressure Vessel Code + National Board Inspection Code, adopted through commissioner rules, aligned with the state building code (RSA 157-A:3); edition not named in statute. Enforced by NH Dept. of Labor, Labor Commissioner (RSA 157-A). Checked on the primary source; the state record was last reviewed 2026-11-12.
Certificate inspections: power boilers annually plus an external inspection; low-pressure steam/vapor heating boilers every two years with internal inspection at least every four; hot water heating/supply boilers, cast-iron boilers and corrosion-prone pressure vessels every two years; two-month grace period (RSA 157-A:8).
Source: primary document
Statewide layer. County and city amendments sit on top; confirm the local office for the address.
In force, nothing scheduled
There is no federal boiler certificate; the state program below is the whole obligation, with the ASME Boiler and Pressure Vessel Code and the National Board Inspection Code as the referenced standards.
These apply when the building has the equipment or fits the type named. The frequency is the standard one; your local official can set a stricter one, so confirm it for the address.
ASME Boiler and Pressure Vessel Code + National Board Inspection Code, adopted through commissioner rules, aligned with the state building code (RSA 157-A:3); edition not named in statute. Certificate inspections: power boilers annually plus an external inspection; low-pressure steam/vapor heating boilers every two years with internal inspection at least every four; hot water heating/supply boilers, cast-iron boilers and corrosion-prone pressure vessels every two years; two-month grace period (RSA 157-A:8).
NH Dept. of Labor, Labor Commissioner (RSA 157-A).
Nothing is scheduled. The rule above stays in force until the state adopts a newer edition or amends the program; AHJ Radar re-checks the source weekly.
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