It regulates the amount of gas supplied to the pilot flame.
Propane pilot light btu.
If your fireplace uses a pilot light for ignition that flame will consume about 600 btu per hour or 14 400 btu per day which equates to about a gallon of propane or about 4 pounds of propane every six days.
Fan ratings select models 120v 60hz 18w 0 15a.
450 24 hours 18 75 days.
90 x 5 gallons 450 hours.
90 000 1 000 90 0 so your pilot light will burn 1 gallon every 90 hours.
Noticed that the pilot light uses a signif amount of fuel.
Dimensions in h x w x d height includes legs 24 09 in.
Max btu 30 000 min btu 15 000 fuel type natural gas ignition electronic push button manifold pressure 5 in.
Because the btu rating of natural gas is lower than propane the hole in the orifice is larger for natural gas.
Note that in newer tank gas water heaters the pilot light is much smaller.
An average pilot light is about 1000 btu s.
It looks like a thimble with a small hole in the end for the gas to pass through.
Minimum for purposes of input adjustment 6 in.
A work around for this on some tankless heaters is to use a spinning turbine in the pipe to detect that water is being used and to provide energy to ignite the gas.