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Boiler permits

Do I need a boiler installation permit?

If your installation exceeds the BTU inputs listed below, you must apply for a permit.

  • When Steam is selected:  Individual boilers or boilers connected to a common circulation manifold if the individual or combined BTU input exceeds 100,000 BTUs for steam boilers.

  • When HWS is selected:  Individual boilers BTU input exceeds 200,000 BTUs for hot water supply boilers, or 200,000 BTUs or a nominal capacity of 120 gallons for potable water heaters.

  • When HWH is selected:  Individual boilers or boilers connected to a common circulation manifold if the individual or combined BTU input exceeds 750,000 BTUs for hot water heating boilers.

Get a permit

Apply or pay for a boiler installation permit. Note:  A new permit system launched June 22, 2020. Users must create a new account and link it to their mechanical bond to obtain and pay for permits.

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.

Questions?