About Us

Welcome to Water Heater Calculator, your trusted resource for accurate water heater sizing and recommendations.

Our mission is to help homeowners and professionals make informed decisions when purchasing and installing water heating systems. We understand that choosing the right water heater—whether it's a traditional storage tank or a modern tankless system—can be confusing. That's why we built this tool.

Why Proper Sizing Matters

An undersized water heater leaves you taking cold showers, while an oversized unit wastes energy and increases your utility bills. Our calculator uses industry-standard formulas to determine the exact Capacity, First Hour Rating (FHR), Flow Rate (GPM), and Temperature Rise you need based on your specific household usage.

Our Commitment

We are committed to providing free, unbiased, and highly accurate calculation tools. While we may earn a small commission through affiliate links if you purchase a recommended product, our calculations and sizing logic are strictly based on mathematical formulas and plumbing standards.