Pennsylvania
For Pennsylvania, governing body is Department of Labor and Industry's Boiler Division; statute citation is Pennsylvania Code No. 104, Boiler and Unfired Pressure Vessel Law, Sections 1 through 17; power boiler inspection interval is annual internal and external inspections, though internal inspections may be extended to 24 months if specific criteria are met; low-pressure boiler inspection interval is biennial internal or external inspections; accepted inspector types is commissioned inspectors from authorized insurance companies and registered owner inspection agencies, recorded from its source on 2026-08-05.
- State
- Pennsylvania verified
- Governing body
- Department of Labor and Industry's Boiler Division
- Statute citation
- Pennsylvania Code No. 104, Boiler and Unfired Pressure Vessel Law, Sections 1 through 17 verified
- Power boiler inspection interval
- annual internal and external inspections, though internal inspections may be extended to 24 months if specific criteria are met verified
- Low-pressure boiler inspection interval
- biennial internal or external inspections verified
- Accepted inspector types
- commissioned inspectors from authorized insurance companies and registered owner inspection agencies verified
- Pressure vessel inspection interval
- Unfired pressure vessels: 3 Years. per nationalboard.org
- Exemptions
- Boilers and pressure vessels owned or operated by the federal government. Boilers located on farms, except in sales areas which are accessible to the public. Boilers located in single-family dwellings or multi-unit dwellings with four or fewer units. Storage water heaters and instantaneous water heaters if heat input does not exceed 200,000 BTU/HR, water temperature does not exceed 210°F, and nominal water-containing capacity does not exceed 120 gallons. per nationalboard.org
What the source says
The Department of Labor and Industry’s Boiler Division administers inspections under Pennsylvania Code No. 104, Boiler and Unfired Pressure Vessel Law, Sections 1 through 17. Authorized inspector types: Pennsylvania accepts commissioned inspectors from authorized insurance companies and registered owner inspection agencies. Inspection frequency: High-pressure boilers require annual internal and external inspections, though internal inspections may be extended to 24 months if specific criteria are met. Low-pressure boilers require biennial internal or external inspections.
— chardonlabs.com, retrieved 2026-08-05
Sources disagree
More than one authority states this, and they do not state the same thing. Both are reproduced with the source each came from — deciding between them is yours, not ours.
Governing body
chardonlabs.com says governing body is Department of Labor and Industry's Boiler Division, as of 2026-08-05.
The Department of Labor and Industry’s Boiler Division administers inspections under Pennsylvania Code No. 104, Boiler and Unfired Pressure Vessel Law, Sections 1 through 17. Authorized inspector types: Pennsylvania accepts commissioned inspectors from authorized insurance companies and registered owner inspection agencies. Inspection frequency: High-pressure boilers require annual internal and external inspections, though internal inspections may be extended to 24 months if specific criteria are met. Low-pressure boilers require biennial internal or external inspections.
https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/
nationalboard.org says governing body is Department of Labor and Industry, Boiler Division, as of 2026-08-05.
INSURANCE INSPECTION REQUIREMENTS Inspections made by inspectors of authorized insurance companies and companies operating vessels in Pennsylvania who have been commissioned by the section are accepted in lieu of inspections made by a boiler section inspector.
https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select
Statute citation
chardonlabs.com says statute citation is Pennsylvania Code No. 104, Boiler and Unfired Pressure Vessel Law, Sections 1 through 17, as of 2026-08-05.
The Department of Labor and Industry’s Boiler Division administers inspections under Pennsylvania Code No. 104, Boiler and Unfired Pressure Vessel Law, Sections 1 through 17. Authorized inspector types: Pennsylvania accepts commissioned inspectors from authorized insurance companies and registered owner inspection agencies. Inspection frequency: High-pressure boilers require annual internal and external inspections, though internal inspections may be extended to 24 months if specific criteria are met. Low-pressure boilers require biennial internal or external inspections.
https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/
nationalboard.org says statute citation is The Pennsylvania Code, No. 104, Boiler and Unfired Pressure Vessel Law, Sections 1 through 17., as of 2026-08-05.
INSURANCE INSPECTION REQUIREMENTS Inspections made by inspectors of authorized insurance companies and companies operating vessels in Pennsylvania who have been commissioned by the section are accepted in lieu of inspections made by a boiler section inspector.
https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select
Power boiler inspection interval
chardonlabs.com says power boiler inspection interval is annual internal and external inspections, though internal inspections may be extended to 24 months if specific criteria are met, as of 2026-08-05.
The Department of Labor and Industry’s Boiler Division administers inspections under Pennsylvania Code No. 104, Boiler and Unfired Pressure Vessel Law, Sections 1 through 17. Authorized inspector types: Pennsylvania accepts commissioned inspectors from authorized insurance companies and registered owner inspection agencies. Inspection frequency: High-pressure boilers require annual internal and external inspections, though internal inspections may be extended to 24 months if specific criteria are met. Low-pressure boilers require biennial internal or external inspections.
https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/
nationalboard.org says power boiler inspection interval is Power boilers, internal and external: 1 Year. (May be extended to 24 months under certain conditions.), as of 2026-08-05.
INSURANCE INSPECTION REQUIREMENTS Inspections made by inspectors of authorized insurance companies and companies operating vessels in Pennsylvania who have been commissioned by the section are accepted in lieu of inspections made by a boiler section inspector.
https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select
Low-pressure boiler inspection interval
chardonlabs.com says low-pressure boiler inspection interval is biennial internal or external inspections, as of 2026-08-05.
The Department of Labor and Industry’s Boiler Division administers inspections under Pennsylvania Code No. 104, Boiler and Unfired Pressure Vessel Law, Sections 1 through 17. Authorized inspector types: Pennsylvania accepts commissioned inspectors from authorized insurance companies and registered owner inspection agencies. Inspection frequency: High-pressure boilers require annual internal and external inspections, though internal inspections may be extended to 24 months if specific criteria are met. Low-pressure boilers require biennial internal or external inspections.
https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/
nationalboard.org says low-pressure boiler inspection interval is Low-pressure steam vapor, hot-water heating and hot-water supply boilers: 2 Years., as of 2026-08-05.
INSURANCE INSPECTION REQUIREMENTS Inspections made by inspectors of authorized insurance companies and companies operating vessels in Pennsylvania who have been commissioned by the section are accepted in lieu of inspections made by a boiler section inspector.
https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select
Accepted inspector types
chardonlabs.com says accepted inspector types is commissioned inspectors from authorized insurance companies and registered owner inspection agencies, as of 2026-08-05.
The Department of Labor and Industry’s Boiler Division administers inspections under Pennsylvania Code No. 104, Boiler and Unfired Pressure Vessel Law, Sections 1 through 17. Authorized inspector types: Pennsylvania accepts commissioned inspectors from authorized insurance companies and registered owner inspection agencies. Inspection frequency: High-pressure boilers require annual internal and external inspections, though internal inspections may be extended to 24 months if specific criteria are met. Low-pressure boilers require biennial internal or external inspections.
https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/
nationalboard.org says accepted inspector types is Inspections made by inspectors of authorized insurance companies and companies operating vessels in Pennsylvania who have been commissioned by the section are accepted in lieu of inspections made by a boiler section inspector., as of 2026-08-05.
INSURANCE INSPECTION REQUIREMENTS Inspections made by inspectors of authorized insurance companies and companies operating vessels in Pennsylvania who have been commissioned by the section are accepted in lieu of inspections made by a boiler section inspector.
https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select
Sources
- chardonlabs.comhttps://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/
- nationalboard.orghttps://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select