Is it the cat combustion or thermostatically controls that give these cat stoves the long even burn? For those who have never taken one apart, here is how it works. Just like the spring of your stove top thermometer control by a spring the Theromsatically control stoves has a similar spring. This spring is attached to the secondary air damper and a probe sensor in the Cat combustor chamber as it heats up it closes the secondary air damper as it cools it opens it to maintain higher heat production. Again one can also manually control the primary air inlet. My point its not just the cat but a combination with secondary air control that gives the longer even heat output. What other stoves employ this technology? Secondary To achieve greater efficiency, thermostatically controlled secondary air mixes with the smoke (which is unburned wood gases). This begins the secondary combustion process. 3) Smoke passes through a catalytic combustor, which lowers the smoke’s burning temperature from 1,200 oF to 600 oF, and causes it to ignite. This secondary combustion turns that smoke into usable heat.