Natural gas does not burn hotter. Propane has about 2-1/2 times the energy per cubic foot than natural gas does. Around 1,050 btu/cu ft for natural gas (methane, ethane, propane mixture) and 2,500 for propane (ethane, propane, butane mixture). So even at the same pressure propane takes less flow to make the same energy.
Also, galvanized pipe is approved for use in LP and natural gas service. When I replaced my propane line to the house 30 years ago I wanted galvanized pipe for corrosion protection, and I doped the joints. I had another engineer at work check out the codes to see if there was any problem with galvanized. Not only was it suitable, it is usually less expensive these days. Many years ago it was cheaper and that is why it was used for gas. I've had lots of arguments over the years as I have installed galvanized gas line several times and it is universally despised. My propane company is on the ball though, they looked it up instead of arguing.
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