The standard NBIC testing is required for standard commercial and industrial boilers, but not all water heaters and boilers fall into this general category. There is a short list of exceptions that are either Federally inspected or do not experience the pressures and heat of commercial boilers; this list includes:
- Boilers controlled by the U.S. government
- Water heaters and boilers in private residences or apartment complexes of no more than six units
- Boilers and water heaters located on Indian reservations
- Lined hot water heaters that do not exceed:
- Heat input of 200,000 British thermal units per hour
- Water temperature of 210 degrees F
- Nominal water-containing capacity of 120 gallons
*Note: An initial certificate inspection is required for these last 3 exemptions. After that there are no further required inspections.*
- Power boilers with over 15 psi steam or vapor pressure
- High-temperature boilers exceeding 160 psi and/or 250 degrees F
- Direct-fired steam-jacketed kettle
- Heating or process boilers not exceeding 15 psi
- Hot-water boilers not exceeding pressures of 160 psi or not exceeding a temperature of 250 degrees F
- Lined hot-water heaters exceeding heat input of 200,000 BTU/hour, water temperature of 210 degrees F, and/or nominal water-containing capacity of 120-gallons.