I'm not sure if you saw my maintenance video's on the Little Giant Heaters.
Once you pull the trigger, the thermostat opens immediately because the cold water is hitting the sensor.
So as long as the trigger is pulled, the flame stays on. Regardless of where the thermostat is set.
Once you release the trigger, the water stops flowing in the heater. At this point, the temperature climbs to where the thermostat is set, and turns the flame off. To get better performance with a Little Giant Heater,
we use a larger gas supply line and the wand jets and pressure setting are also a factor. This is what we do to get the system to maintain at a higher temperature while the trigger is pulled.
I know this seems to be a little odd way to explain it, but if you need any help with a Little Giant Heater, give me a call.