18-Cyng): 22,500 BTU/Hour normal inlet pressure 7" water column
18-Cyp): 17,000 BTU/Hour normal inlet pressure 11" water column
Installation: 1" cast brass adapter has standard female NPT pipe threads for connectionto 1" steel pipe (supplied by others). Optional 3/4" adapter available - see spec sheet for details
Valve: 1" brass shut-off valve required (supplied by others)