A computerized monitoring system shall be equipped with an automatic burner shutdown mechanism that will activate when: Stack flue gas reaches high temperature; and One of the following occurs, as applicable: For a steam boiler: Steam reaches high pressure; or Water reaches Low or high level; For a hot water boiler operating at 30 to 299 horsepower, water reaches high temperature; or For a hot water boiler operating at 300 or more horsepower, water reaches: High pressure; High temperature; or Low level.