Laars MASCOT FT MFTCW Installation And Operation Instructions Manual page 29

Mascot FT Combination Boiler Page 27
SECTION 4. Installation
4.9 Gas Supply and Piping
Suggested Natural Gas (NG) Layout
Suggested Propane Gas (LP) Layout
Combination boiler must be installed downstream of the gas meter for adequate gas supply.
Combination boiler gas connection pipe not less than a 1/2".