Bosch 940 ESO Instruction Manual page 19

GAS LINE SIZING
The gas supply piping for a single heater should be
sized for a maximum draw of 199,000 BTUH. Measure
the length of gas supply line and use the tables in
Fig. 26, page 20 or the gas line manufacturer's sizing
tables to determine the pipe diameter necessary to
accommodate the 199,000 BTU demand of the heater.
If there are more gas appliances on the line, size the gas
line according to the total maximum amount of BTU
input rating for all appliances.
Note: Undersizing the gas line may result in diminished
hot water flow rate and temperature. See chapter 7.6,
page 25 for the procedure to confirm gas pressure.
Proper gas pressure must be confirmed at time of
installation.
Gas piping
Fig. 25
6 720 644 956
Inlet gas particle screen
(included)
Installation instructions
19