Glass manufacturing apparatus and methods

A method of manufacturing a glass ribbon with a glass manufacturing apparatus, the method comprising:

• flowing molten material from a delivery vessel to a forming vessel through a channel of a conduit in a flow direction of the conduit, the conduit comprising a closed sidewall surrounding the channel and continuous from the delivery vessel to an inlet of the forming vessel;
• heating the molten material flowing through the channel with a heating enclosure surrounding the conduit, the heating enclosure comprising a plurality of removable heating elements and a plurality of walls surrounding a chamber within which the conduit extends, the plurality of walls comprising a plurality of removable heating walls, each heating element of the plurality of heating elements positioned within the chamber between a corresponding heating wall of the plurality of heating walls and the conduit to increase a temperature within the channel.