# New Hampshire — US boiler and pressure vessel inspection requirements by state

For New Hampshire, governing body is New Hampshire Department of Labor; statute citation is New Hampshire Revised Statutes, Annotated and Administrative Rules, New Hampshire Department of Labor, Title 12. Public Safety and Welfare, Chapter 157-A. Boilers and Pressure Vessels, Sections A1 through A14; power boiler inspection interval is One annual certificate inspection; One annual external inspection while under pressure, if possible; low-pressure boiler inspection interval is one biennial certificate inspection, with an internal inspection at least once quadrennially where construction permits; pressure vessel inspection interval is one biennial certificate inspection, recorded from its source on 2026-08-05.

- **State:** New Hampshire
- **Governing body:** New Hampshire Department of Labor
- **Statute citation:** New Hampshire Revised Statutes, Annotated and Administrative Rules, New Hampshire Department of Labor, Title 12. Public Safety and Welfare, Chapter 157-A. Boilers and Pressure Vessels, Sections A1 through A14.
- **Power boiler inspection interval:** One annual certificate inspection; One annual external inspection while under pressure, if possible. _(verified: appears in the quote below)_
- **Low-pressure boiler inspection interval:** one biennial certificate inspection, with an internal inspection at least once quadrennially where construction permits _(verified: appears in the quote below)_
- **Pressure vessel inspection interval:** one biennial certificate inspection _(verified: appears in the quote below)_
- **Accepted inspector types:** Inspectors employed by insurance companies and commissioned by the department are accepted in lieu of inspections made by a department inspector.
- **Exemptions:** Properties used exclusively as private residences or apartment houses of fewer than three family units. Properties used exclusively as private residences or apartment houses with three or more family units with an output of less than 200,000 BTU per hour.

## What the source says

> Power boilers and high-pressure, high-temperature water boilers: One annual certificate inspection; One annual external inspection while under pressure, if possible. Low-pressure steam or vapor heating boilers, hot-water heating and hot-water supply boilers: one biennial certificate inspection, with an internal inspection at least once quadrennially where construction permits. Pressure vessels: one biennial certificate inspection.

## Source

- https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select

Last verified: 2026-08-05. Review by: 2027-08-05.
Part of [US boiler and pressure vessel inspection requirements by state](https://referencesource.org/boiler-inspection-requirements-by-state/).