Oakey Senior Member Location New Jersey Jun 8, 2007 #1 Does a natural gas pool heater require a fireman's switch?
L LawnGuyLandSparky Senior Member Jun 8, 2007 #2 Depends on the heater. If it has an internal pressure switch, no.
G george t. everett Senior Member Location New York Jun 8, 2007 #3 It is not required by code, but usually by manufacturer's instructions.