Based on this product's specifications, here are some alternatives and similar models
Cast iron warmer for KingHoff KH-1807 jug brewers — KingHoff
Summary description:
Cast iron warmer designed for use with KingHoff KH-1807 jug brewers. Provides a stable heat source to keep brewed beverages warm for serving. Compatible with jug-type brewers and suitable for kitchen or catering use where maintaining beverage temperature is required. Durable cast iron construction ensures even heat distribution and long service life.