We're in need of a new 40 gallon ( 30 gal. , only 2 of us ) electric water heater . It's a RHEEM that's nearly 15 years old and we don't think the original owners of the home ever flushed it . The well water has lots of iron so not appliance friendly . We've looked at RICHMOND ( RHEEM ), RHEEM , G.E. ( Rheem ) , and Whirlpool . All have a 5 year or 6 year warranty . What would be your choice ? Other brands for suggestion are welcome . THANKS