Water Heater Mfr: American Water Heater Co
Model: G62-40T34-3N
Capacity: 40 gal, gas-heated, 34000 BTU/HR
Installed in 1998, Souther California, Very Hard Water, No Water
Softening system.
6 year Mfr warranty.
Never maintained.


Currently makes gurgling sounds (like marbles rolling around in tank)
when hot water faucet downstairs is turned on.
Is draining/flushing the water heater now (something that should have
been done every 6-12 months) a bad idea?