The HotRot 3518 is the largest single unit and is constructed from pre-cast concrete or pre-fabricated steel sections. Designed to be used by larger municipalities and sewage treatment plants, multiple units can process any quantity of organic waste but HotRot generally recommends plant of less than 180tpd to minimise transportation distances and local impacts.

The HotRot 3518 is designed for outdoor operation;

additional insulation (winterisation) is available for extreme climates.

It would be normally to locate any feed hoppers within a waste reception building, with the HotRot units outside. Product conveyors can either discharge in to a storage building or open temporary storage bunkers.