Abstract: A forced air room heater for installation in a Franklin stove includes a mounting plate configured for covering the flue opening located in the back wall of the stove and having a central opening passing therethrough. A plenum chamber arranged for placement above the baffle which divides the firebox of the stove has an inlet interconnecting it to the opening in the mounting plate and an outlet opening outside of the stove. An electric motor powered fan is attached to the mounting plate opposite the inlet for forcing air first into the plenum where it is heated, then out of the outlet. In one embodiment the outlet opens out of the stove through its front door opening. In a second embodiment the outlet exits the stove through the mounting plate allowing operation of the stove with its door closed.