2KW Heaters. Showing all 4 results TH-S2-12-A1-Heater | Digital Switch Read more; TH-S2-12-A1-Heater | Knob Switch Hetian Introduction. Hetian Group specializes in the design, development, production and sales of TianRiver brand diesel air heater series products, a leading manufacturer of diesel air heater in China. Social Media Hetian ...