Def. Heater W/ Tstat

James for Model Number Tfh24prsmww

Answer Hello James. If one of the heaters are bad on the unit, it is best to replace both heaters. That is why they sell them as a kit WR51X443. Hope this helps. 

Albert A for Model Number TFX27PF

Answer Hello Albert. Yes, based on the model number you provided, WR51X443 is the correct defrost heater and thermostat assembly. Hope this helps. 

Hutch for Model Number p/n wr51x443

Answer Hello Hutch! The heater assembly WR51X443 has two heaters measured at 12 1/4". Thanks! 

Sam for Model Number TPX24PPBABB

Answer Hello Sam! It seems you have a deforst system problem. The defrost system is made up of three parts; defrost thermost WR50X122, defrost heater WR51X443, and desfrost control WR9X489. You will need to check to see which part has failed. Hope this information helps!