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I think you maybe should be concerned cause there is such a thing as water toxic
where you can drink yourself to death.
He could have an electrolyte imbalance or something so ask the vet.
Farmerjohn is right too it could be a sign of diabetes
At 16 years old, this is a geriatric boy! He definitely needs to see the vet. Increased water consumption can be a sign of kidney problems, diabetes, infections, or other serious problems. Occasionally older dogs have a problem similar to Alzheimer's in people, and their eating/drinking or sleep/wake cycles can change dramatically.
It may turn out to be nothing major, but an ounce of prevention....!