Ohio Rev. Code Ann. § 4104.12

All boilers, except boilers mentioned in section 4104.04 of the Revised Code, shall be inspected when installed and shall not be operated until an appropriate certificate of operation has been issued by the superintendent of industrial compliance. The certificate of operation required by this section shall not be issued for any boiler which has not been thoroughly inspected during construction and upon completion, by either a general or special inspector, and which does not conform in every detail with the rules adopted by the board of building standards and unless, upon completion, such boiler is distinctly stamped under such rules by such inspector.