You can take a reading yourself: turn your furnace and HWH to "vacation" for a couple hours (or as long as you can stand) and take a reading. The smallest hand on my gas meter moves visibly with just a pilot light on (about as visibly as the minute hand on a large analog clock), but I didn't actually take a reading.
You'd have to defeat a few safety interlocks to modify the ignition system in a combustion appliance, and while the risk of disaster may be remote, I'd steer well clear of it.
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