A.O. Smith vs Rinnai — 2026 Comparison
Which is better for Northern California homeowners — A.O. Smith or Rinnai? We compare warranty, reliability, efficiency, and value.
A.O. Smith
Leading water heater manufacturer trusted by professionals for 150+ years
- Tier: mid
- Founded: 1874
- HQ: Milwaukee, WI
- Warranty: 6–12 year tank warranty
Rinnai
Leading tankless water heater brand with endless hot water technology
- Tier: premium
- Founded: 1920
- HQ: Nagoya, Japan
- Warranty: 12-year heat exchanger, 5-year parts
Bottom Line
Both A.O. Smith and Rinnai are solid choices for Northern California homeowners. The best pick depends on your budget, home size, and priorities.
Our licensed contractors work with both brands and can recommend the best fit for your specific situation. Get a free consultation by calling (916) 476-7689 or filling out the form below.