Example: F30CSRN - H
 An instantaneous steam fired water heater with a F30 base recovery rating, copper tubing heating coil, cast iron heat exchanger shell, with a steam pressure reducing valve factory supplied to limit the steam pressure to 15psi maximum.

Option Note
Any and all optional equipment for a water heater must be called out in the written specifications. A model number in and of itself does not reflect any optional equipment selected.