If it's an oil fired domestic hot water heater, it's an aquastat. You should
have the burner adjusted by someone with proper equipment



"traderfjp" wrote in message
oups.com...
I changed the controls on my burner tonight and the burner is still
shutting off. I watched the burner run through its cycle and once the
hot water heater hit temperature the burner turned off and the reset
button popped up to break the circuit at the same time. I've also
replaced the pump, nozzle and transformer. Does this sound like it
could be the thermostat?