plumbing - Do hot water tanks have to be in the drain pan - Home Improvement Stack Exchange

I bought a new hot water tank and had it installed by a plumber. It didn't fit in the existing drain pan, so he put it on top of the pan. Is this safe?

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plumbing - Replacing 47-gal electric water heater with no pan and elevated drain - Home Improvement Stack Exchange

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plumbing - Do hot water tanks have to be in the drain pan - Home Improvement Stack Exchange

How high to raise water heater above floor? - Home Improvement Stack Exchange