Atlanta stove works huntsman

Back then, ratings were in square feet with 8 foot ceiling. Unfortunately they didn't take into account the different zones that vary temperatures across the country. Seattle Washington was used as a basis and exact heating capacity in BTU is calculated by the surface temperature of each square inch of surface area. Your stove was based on the Fisher design and the nearest Fisher licensee to Atlanta Stove Works complained plenty about patent infringement.
Going by Fisher's calculations will get you close for your size firebox;
Baby Bear with one intake on door that accepts 18 inch logs with firebox of 14W X 22 deep approx; 1000 sf or up to 1250 sf.
Mama Bear with two intakes that accepts 24 inch log with firebox of 16 X 27 deep approx; 1500 sf. or up to 1750 sf.
Papa Bear with two intakes that accepts 30 inch logs with firebox of 18 X 32 deep approx. 2000 sf or up to 2250 sf.

Could be your model number starting with 24 corresponds to a 24 inch log being Mama Bear size?

Manual here confirms the 241 is a Mama Bear size.
https://www.hearth.com/images/uploads/ASW_Huntsman241.pdf

With the advent of more insulation and high performance doors and windows those square footage figures can be increased in most homes and locations.