Nev. Admin. Code § 704.830
If an inspector finds that a furnace, boiler or heat pump in a residential building or dwelling unit uses as its primary source of energy any fuel or source of energy other than a fuel or source of energy sold by the utility which serves the customer, the inspector shall not consider replacing the existing equipment with more efficient equipment unless the inspector first obtains the customer's signature to the following statement:
Although the (name of utility) has personnel qualified to conduct an inspection of your (furnace, boiler or heat pump), if your home is heated by a fuel or source of energy other than (types of fuels supplied by utility), the utility cannot inspect your furnace, boiler or heat pump unless you specifically request it to do so. Federal law requires that such a request be made in writing. If you want us to inspect your furnace, although we do not supply the fuel for it, please sign below.
Nev. Admin. Code § 704.830
NRS 703.025, 704.210