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COVID-19 resources here. License exams remain canceled. Unemployment questions? Visit Server maintenance June 7, 5-6 p.m.

Note: Inspections of boilers and pressure vessels throughout Minnesota will continue during the COVID-19 pandemic. Prior to an inspection we will contact owners to schedule or reschedule the inspection. We will not attempt to perform an inspection in a facility where owner/management has immediate health concerns for residents or patients during the COVID-19 pandemic. For help with questions, contact your regional inspector

New permit system

A new permit system launches summer 2020. Subscribe for email updates to be notified when the system launches, how to set up a new account and related news.

  • Permits for existing projects will migrate, so any work-in-progress will be available and completed in the new system once it launches.

  • Once the new system launches, users must create a new account to request permits. Existing payment accounts created through U.S. Bank will continue to work.

Do I need a boiler installation permit?

The installation of individual boilers or boilers connected to a common circulation manifold requires a permit if the individual or combined BTU input exceeds:

  • 100,000 BTUs for steam boilers;

  • 500,000 BTUs for hot water supply boilers; or

  • 750,000 BTUs for hot water heating boilers.

If your installation exceeds the above BTU inputs, you will need to apply for a permit.

Get a permit

To obtain a permit, contact your area's boiler inspector.

There is no fee for the permit application and the installer is invoiced after the inspection. Inspection fees are $80 per hour.

Installer requirements

Mechanical contractors are required to file a $25,000 mechanical contractor bond to contract to perform gas, heating, ventilation, cooling, air conditioning, fuel burning or refrigeration work in Minnesota. The bond must be on a form approved by DLI and written by a surety company licensed to do business in Minnesota. View more information about mechanical bonds.

Inspection requirements

All boiler installations require a hydrostatic test applied to the boiler. The test pressure should be approximately 75 percent of the safety valve set pressure. Example: 15 psi safety valve set pressure, 11 psi hydrostatic test pressure. The test pressure must hold for at least 10 minutes.

All boilers are subjected to an operational test of all boiler controls. View the checklist used by inspectors.


Contact us at 651-284-5544 or

Visit the boiler engineer web page