: Indicates the factory-installed auxiliary electric heat kit capacity. The "20" denotes 19.2 kW (commonly rounded to 20 kW) of supplemental resistance heating, providing approximately 65,530 BTU/h of emergency or backup warmth.
: Denotes the specific electrical configuration and circuit breaker arrangement. According to official Rheem RHQA Series HVAC documentation on Scribd , the letter T specifies a 240/208V, Single-Phase (1Ø) system with a Circuit Breaker Combination Circuit for 11 kW or more . Technical Specifications & Engineering Limits rheem model no rhqa 1220t pdf