Both A.O. Smith and Rheem offer high-quality electric water heaters, but A.O. Smith is often favored for efficiency, while Rheem is praised for innovation and warranty options.
Choosing between AO Smith and Rheem electric water heaters can be challenging. Both brands dominate the market with reliable products, but key differences in efficiency, warranty, and technology set them apart. This detailed comparison will help you make the right choice for your home.
Brand Overview
Rheem Water Heaters
Rheem has been a leader in water heating since 1925. They offer a wide range of electric water heaters with innovative features like:
- EverKleen self-cleaning system
- EcoNet smart technology
- High-efficiency heat pump models
AO Smith Water Heaters
AO Smith entered the market in 1874 and is known for durable construction. Their electric water heaters feature:
- Blue Diamond glass-lined tanks
- Smart water leak detection
- Energy Star certified models
Energy Efficiency Comparison
| Model | UEF Rating | Annual Operating Cost |
|---|---|---|
| Rheem Performance Platinum 50-Gallon | 0.95 | $210 |
| AO Smith Signature Premier 50-Gallon | 0.90 | $230 |
Rheem models typically have higher Uniform Energy Factor (UEF) ratings, meaning better efficiency and lower operating costs. The difference can add up to $100+ in annual savings for larger households.
Warranty and Reliability
Rheem Warranties
Rheem offers:
- 6-12 year standard warranties
- Optional ProtectionPlus extension to 16 years
- Lifetime warranty on Marathon series
AO Smith Warranties
AO Smith provides:
- 3-12 year limited warranties
- 1 year labor coverage
- Strict installation requirements
For comprehensive warranty protection, consider the best water heater thermostat control to maintain optimal performance.
Installation and Maintenance
Ease of Installation
Rheem units feature:
- Flexible venting options
- Side water connections
- Clear installation manuals
AO Smith heaters may require:
- Additional adapters
- Specialized tools
- Professional installation
Maintenance Requirements
Rheem’s self-cleaning systems reduce sediment buildup, while AO Smith models may need more frequent flushing. For maintenance tools, check the best water heater element wrench.
Technology and Features
Smart Features
Rheem leads with:
- Wi-Fi connectivity
- Leak detection systems
- Voice control compatibility
AO Smith offers basic smart controls on premium models. For advanced heating solutions, explore the Department of Energy’s water heating guide.
Heating Technology
Both brands use advanced heating elements, but Rheem’s Consumer Reports recommended heat pump technology provides superior efficiency in compatible climates.
Price Comparison
| Capacity | Rheem Price Range | AO Smith Price Range |
|---|---|---|
| 40-Gallon | $500-$800 | $450-$750 |
| 50-Gallon | $600-$1,000 | $550-$900 |
| 80-Gallon | $1,000-$1,500 | $900-$1,400 |
While AO Smith models are generally cheaper upfront, Rheem’s higher efficiency often results in lower lifetime costs.
Final Recommendation
For most homeowners, Rheem offers better long-term value with:
- Higher energy efficiency
- Longer warranties
- Advanced smart features
- Lower maintenance requirements
However, AO Smith remains a solid choice for budget-conscious buyers who prioritize basic reliability over advanced features.
