A catalyst regenerator, comprising: a regenerator housing containing a dense phase catalyst bed suitable to receive a catalyst to be regenerated, wherein the catalyst is at least partially covered with a carbonaceous coke that is combusted to provide a heated catalyst; a heater disposed in the regenerator comprising: a body having a first end and a second end; a fuel nozzle disposed within the body and suitable to eject a mixture of fuel and oxygen-lean gas; a plurality of windows defined near the first end of the body where a vaporized mixture of fuel and oxygen-lean gas can exit the body into the dense phase catalyst bed a standpipe portion and a plug valve assembly for receiving the catalyst to be regenerated; a centerwell receiving a lower end of the standpipe portion and defining an annulus around the lower end of the standpipe portion, wherein the plug valve assembly is suitable to introduce the catalyst into the annulus; a catalyst distributor communicably coupled to the annulus and suitable to disperse the catalyst into the dense phase catalyst bed where the carbonaceous coke is combusted; an air distributor disposed in the dense phase catalyst bed for introducing an oxidant into the dense phase catalyst bed; and a catalyst discharge outlet in fluid communication with the dense phase catalyst bed; characterized in that the heater also includes a plurality of perforations defined near the second end of the body and suitable to draw in the heated catalyst to vaporize the mixture of fuel and oxygen-lean gas, wherein the heated catalyst is drawn in from the dense phase catalyst bed. a regenerator housing containing a dense phase catalyst bed suitable to receive a catalyst to be regenerated, wherein the catalyst is at least partially covered with a carbonaceous coke that is combusted to provide a heated catalyst; a heater disposed in the regenerator comprising: a body having a first end and a second end; a fuel nozzle disposed within the body and suitable to eject a mixture of fuel and oxygen-lean gas; a plurality of windows defined near the first end of the body where a vaporized mixture of fuel and oxygen-lean gas can exit the body into the dense phase catalyst bed a body having a first end and a second end; a fuel nozzle disposed within the body and suitable to eject a mixture of fuel and oxygen-lean gas; a plurality of windows defined near the first end of the body where a vaporized mixture of fuel and oxygen-lean gas can exit the body into the dense phase catalyst bed a standpipe portion and a plug valve assembly for receiving the catalyst to be regenerated; a centerwell receiving a lower end of the standpipe portion and defining an annulus around the lower end of the standpipe portion, wherein the plug valve assembly is suitable to introduce the catalyst into the annulus; a catalyst distributor communicably coupled to the annulus and suitable to disperse the catalyst into the dense phase catalyst bed where the carbonaceous coke is combusted; an air distributor disposed in the dense phase catalyst bed for introducing an oxidant into the dense phase catalyst bed; and a catalyst discharge outlet in fluid communication with the dense phase catalyst bed;