Originally Posted by carvedog
Anodized should be slightly higher melting point. The one we ruined was regular aluminum. We were checking it regularly and it went from looking fine to dripping into the 4 burner Partner in about .0002 seconds.
Quick google shows temp of propane burners above 2K.
The theoretical max temp of a propane flame is about 3600F, but that's an adiabatic measure assuming zero heat loss to atmosphere and a perfect gas mixture. In reality, you're likely seeing flame in the 600-1500F range from a blaster, depending on the setting.
This site has a bit of a breakdown of tests on open flames, and they noted: "In a related study, Ingason and de Ris  found typical flame tip temperatures of 400°C for burner flames of propane, propylene, and carbon monoxide fuels."
Temperatures in flames and fires
I'm probably reading that wrong and missing something, but given the variability in air temp, wind, etc, I'd say that a low BTU burn to heat an anodized DO lid should be fine, just don't leave it on the flame for an hour.