I'd say..........check every connection with soapy water with everything open and the heater not running. This will give you an idea if you have any leaks.
Normally, messing around with 10 year old screw fittings, something will need
to be tightened up. The soap and water at each joint and valve will tell you
after you replumb the new unit.
Checking the gas pressure at the gas valve inlet and outlet is a piece of cake if you have the W.C. gauge....
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