AO Smith vs Rheem vs Bradford White

All three brands build to similar specs on paper, but the differences show up after a few years in Tampa hard water. AO Smith runs the ProMax line for residential and the Voltex hybrid heat pump line for high-efficiency installs. The tank is glass-lined steel with a magnesium anode rod standard, and warranty tiers run 6, 9, and 12 years depending on the model. The 12-year ProMax doubles up the anode rod and uses a thicker tank wall, which is the version we recommend if a customer insists on AO Smith.

Rheem splits its lineup into Performance (entry, sold at Home Depot), Performance Plus (mid-tier, contractor channel), and Marathon (a polybutene tank that will not rust, premium). Heating elements use a brass-coated base on the Plus and Marathon lines, and the dip tube is a heavy-duty cross-linked polymer that resists Tampa sediment buildup better than the entry tier. Warranties match the AO Smith ladder at 6, 9, and 12 years. Rheem’s parts catalog is the deepest of the three, which matters when a tank fails out of warranty and a homeowner wants a fast repair instead of a full replacement.

Bradford White builds the Defender Safety System line and the IconReliable line, both vitreous glass-lined with their Hydrojet sediment-reducing dip tube. The big difference is contractor-only sales. You will not find Bradford White at Home Depot or Lowe’s, which keeps installation quality higher because every unit goes through a licensed plumber. Tank gauge is heavier than AO Smith ProMax (typically 14-gauge vs 16-gauge on the AO Smith entry models), and the powered anode option on premium models extends rod life past the typical 5-year mark. Warranties run 6 or 10 years on residential, with extended commercial options.

Tampa city water averaged 10.8 grains per gallon of hardness in 2024, which counts as very hard. That mineral load shortens water heater life compared to the manufacturer’s rated lifespan, especially without preventive maintenance. The brand differences become real once that hard water starts working on the tank.

Rheem wins for value and parts availability, which is why we install Rheem as our preferred brand. The Performance Plus and Marathon lines hold up well in our service area, and when something does fail, we can usually source the replacement part same-day from local supply houses. Bradford White wins for premium build quality and tends to hold up a bit longer in Tampa hard water. The heavier-gauge tank wall and the Hydrojet dip tube reduce sediment accumulation, which is the main failure mode here. AO Smith lands in the middle on both fronts, with the 12-year ProMax being competitive and the 6-year entry models being short-lived in our climate.

Annual flushing is mandatory in Tampa regardless of brand. We pull 2 to 3 pounds of sediment out of the average 50-gallon tank during a service visit, and homes that skip annual flushes typically need a full replacement sooner. Replacing the anode rod when it is spent protects the tank by sacrificing the rod instead of the tank wall. Coastal homes in Pinellas County and the Gulf-side neighborhoods see exterior tank corrosion regardless of brand because of salt-air exposure, so cabinet placement matters as much as brand selection. Real Tampa lifespans we observe in the field vary by brand, and Rheem, AO Smith, and Bradford White all last longer with annual flush plus anode replacement on schedule.

Bradford White for longevity, A.O. Smith for availability. Bradford White is sold only through plumbing supply houses, uses a heavier tank and its Hydrojet sediment-reducing dip tube, and in Tampa hard water it typically lasts a bit longer than the other two. A.O. Smith is everywhere, including the big box stores through its Signature line, and its premium 12-year models are competitive, but its entry 6-year models are short-lived here.

This is the closest match of the three. Both offer 6, 9, and 12-year warranty tiers and similar tank construction, and a 50 gallon installs at similar prices ($1,845 for either brand’s entry 6-year model). Rheem gets our preference for its parts availability and warranty support in Tampa Bay. A.O. Smith is a solid choice, especially the 12-year models.

Whichever brand you pick, a yearly flush matters more than the badge in our hard water. Our $89 water heater flush includes a FREE whole-house plumbing inspection.