Michigan
For Michigan, governing body is Department of Licensing and Regulatory Affairs' Boiler Division; statute citation is Michigan Compiled Laws, Skilled Trades Act of 2016, Sections 339.5901 through 339.5947; power boiler inspection interval is annual certificate inspections and annual external inspections while under pressure within six months of the internal inspection; low-pressure boiler inspection interval is biennial certificate inspections, with a two-month grace period allowed; accepted inspector types is Department inspectors conduct all new and secondhand boiler inspections. For ongoing inspections, licensed inspectors from insurance companies, recorded from its source on 2026-08-05.
- State
- Michigan verified
- Governing body
- Department of Licensing and Regulatory Affairs' Boiler Division
- Statute citation
- Michigan Compiled Laws, Skilled Trades Act of 2016, Sections 339.5901 through 339.5947 verified
- Power boiler inspection interval
- annual certificate inspections and annual external inspections while under pressure within six months of the internal inspection verified
- Low-pressure boiler inspection interval
- biennial certificate inspections, with a two-month grace period allowed verified
- Accepted inspector types
- Department inspectors conduct all new and secondhand boiler inspections. For ongoing inspections, licensed inspectors from insurance companies verified
- Exemptions
- Those under federal control. Swimming pool heaters and open car-wash heaters. Miniature steam or marine engines for hobby usage. A boiler used in power plants of self-propelled vehicles designed primarily for the transportation of persons or property upon a highway. Boilers used on mint farms for mint processing. A non-vaporizing, organic-fluid boiler meeting certain criteria. A low-pressure steam boiler that has a volume of less than 5 cubic feet and that does not have piped feed connect. Those on Tribal Land. Boilers used solely for agricultural purposes. Steam or vapor boilers not exceeding 15 psi and hot-water boilers not exceeding 160 psi or a temperature of 250°F located in private residences or apartment or condo buildings of fewer than six families. per nationalboard.org
What the source says
Boiler Division oversees inspections under Michigan Compiled Laws, Skilled Trades Act of 2016, Sections 339.5901 through 339.5947. Authorized inspector types: Department inspectors conduct all new and secondhand boiler inspections. For ongoing inspections, Michigan accepts licensed inspectors from insurance companies. Inspection frequency: High-pressure boilers require annual certificate inspections and annual external inspections while under pressure within six months of the internal inspection. Low-pressure boilers require biennial certificate inspections, with a two-month grace period allowed.
— 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 Licensing and Regulatory Affairs' Boiler Division, as of 2026-08-05.
Boiler Division oversees inspections under Michigan Compiled Laws, Skilled Trades Act of 2016, Sections 339.5901 through 339.5947. Authorized inspector types: Department inspectors conduct all new and secondhand boiler inspections. For ongoing inspections, Michigan accepts licensed inspectors from insurance companies. Inspection frequency: High-pressure boilers require annual certificate inspections and annual external inspections while under pressure within six months of the internal inspection. Low-pressure boilers require biennial certificate inspections, with a two-month grace period allowed.
https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/
nationalboard.org says governing body is Department of Licensing and Regulatory Affairs, Bureau of Construction Codes, Boiler Division, as of 2026-08-05.
Michigan Compiled Laws, Skilled Trades Act of 2016, Sections 339.5901 through 339.5947 RULES FOR CONSTRUCTION AND STAMPING Construction:
https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select
Power boiler inspection interval
chardonlabs.com says power boiler inspection interval is annual certificate inspections and annual external inspections while under pressure within six months of the internal inspection, as of 2026-08-05.
Boiler Division oversees inspections under Michigan Compiled Laws, Skilled Trades Act of 2016, Sections 339.5901 through 339.5947. Authorized inspector types: Department inspectors conduct all new and secondhand boiler inspections. For ongoing inspections, Michigan accepts licensed inspectors from insurance companies. Inspection frequency: High-pressure boilers require annual certificate inspections and annual external inspections while under pressure within six months of the internal inspection. Low-pressure boilers require biennial certificate inspections, with a two-month grace period allowed.
https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/
nationalboard.org says power boiler inspection interval is A power boiler, process boiler, or high-pressure, high-temperature water boiler shall receive a certificate inspection annually and shall also be externally inspected annually, while under pressure, within six months from the date of the internal inspection., as of 2026-08-05.
Michigan Compiled Laws, Skilled Trades Act of 2016, Sections 339.5901 through 339.5947 RULES FOR CONSTRUCTION AND STAMPING Construction:
https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select
Low-pressure boiler inspection interval
chardonlabs.com says low-pressure boiler inspection interval is biennial certificate inspections, with a two-month grace period allowed, as of 2026-08-05.
Boiler Division oversees inspections under Michigan Compiled Laws, Skilled Trades Act of 2016, Sections 339.5901 through 339.5947. Authorized inspector types: Department inspectors conduct all new and secondhand boiler inspections. For ongoing inspections, Michigan accepts licensed inspectors from insurance companies. Inspection frequency: High-pressure boilers require annual certificate inspections and annual external inspections while under pressure within six months of the internal inspection. Low-pressure boilers require biennial certificate inspections, with a two-month grace period allowed.
https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/
nationalboard.org says low-pressure boiler inspection interval is A low-pressure steam or vapor heating boiler shall receive a certificate inspection biennially. Hot-water heating and hot-water supply boilers shall receive a certificate inspection triennially., as of 2026-08-05.
Michigan Compiled Laws, Skilled Trades Act of 2016, Sections 339.5901 through 339.5947 RULES FOR CONSTRUCTION AND STAMPING Construction:
https://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select
Accepted inspector types
chardonlabs.com says accepted inspector types is Department inspectors conduct all new and secondhand boiler inspections. For ongoing inspections, licensed inspectors from insurance companies, as of 2026-08-05.
Boiler Division oversees inspections under Michigan Compiled Laws, Skilled Trades Act of 2016, Sections 339.5901 through 339.5947. Authorized inspector types: Department inspectors conduct all new and secondhand boiler inspections. For ongoing inspections, Michigan accepts licensed inspectors from insurance companies. Inspection frequency: High-pressure boilers require annual certificate inspections and annual external inspections while under pressure within six months of the internal inspection. Low-pressure boilers require biennial certificate inspections, with a two-month grace period allowed.
https://www.chardonlabs.com/resources/commercial-boiler-inspection-regulations-by-state/
nationalboard.org says accepted inspector types is Inspections, except first inspections and inspections of secondhand boilers, made by inspectors employed by insurance companies and licensed by the department are accepted in lieu of inspections made by a department inspector., as of 2026-08-05.
Michigan Compiled Laws, Skilled Trades Act of 2016, Sections 339.5901 through 339.5947 RULES FOR CONSTRUCTION AND STAMPING Construction:
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