Miele HR 1124-3 AG Installation Instructions Manual page 108

Gas connection
The installation must comply with
local regulations or, if there are no
local regulations, the National Fuel
Gas Code, ANSI Z223.1/NFPA 54.
The gas pressure may not
undershoot or exceed certain values.
Make sure that the maximum gas
pressure upstream of the gas
pressure controller does not amount
to more than 1/2 psi (3.5 kPA) for
natural gas NG and liquid propane
LP.
Make sure that the minimum gas
pressure amounts to a 6" water head
in the case of natural gas and a 11"
water head in the case of propane
gas.
108
1/2" NPT