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EAP Policy Manual FFY24 Chapter 16 Mechanical Contractors Page 5 • For fuel oil units the AFUE must be at least 80%. • Sealed combustion two-pipe system except when prevented by a dwelling’s physical conditions. • Burner with a minimum of two (2) stages. • Electronically commutated (EC) motor. For replacement boilers the AFUE must be at least 80% or higher, when possible. Exceptions to installing a high efficiency heating system include: • Physical conditions exist that prevent installation. • Biofuel burning heating units. In mobile homes, the replacement must: • Be certified for use in a mobile home and installed to manufacturers’ specifications. • Be installed as one complete unit from the base of the furnace to the top of the vent on the roof. • Use the same method for supplying combustion air and venting as the original equipment, unless it is a pre-code mobile home. • Be approved by the MN Department of Labor and Industry if it is an alteration to the mobile home. • Alterations to the heating system are allowed in pre-code manufactured homes constructed on or before July 1, 1972. • Have the ducts connected to the furnace cabinet when a furnace with a package air or blend air system is replaced. • Meet the HUD code for drywalling of the furnace and water heater compartments. Electrical Work New, extended, additional, or altered wiring to the unit must be performed by a licensed electrician or a heating contractor with a certificate of completion to do electrical work inside or physically attached to a heating system. This includes low voltage wiring, such as the wiring for a thermostat.