Water Heater Size Calculator
Find the perfect water heater size for your home. Calculate capacity needs based on family size, peak hour demand, and hot water usage patterns.
Step 1: Household Details
Understanding Peak Demand
Peak hour demand refers to the maximum amount of hot water your household uses during the busiest hour. Consider simultaneous showers, laundry, and dishwasher use when estimating.
Step 2: Usage Patterns
About Water Heater Types
Storage tank heaters store hot water for immediate use. Tankless heaters heat water on demand and are more energy efficient. Heat pump and solar heaters are the most energy-efficient options but have higher upfront costs.
Recommended Water Heater Size
Recommended Tank Capacity
Water Heater Type Comparison
| Heater Type | Capacity Range | Efficiency | Lifespan | Cost Range |
|---|
Hot Water Usage Breakdown
Sizing Formula
First Hour Rating = Peak Hour Demand × Safety Factor
The First Hour Rating (FHR) determines how much hot water your heater can supply during peak usage. It’s calculated based on your household’s peak hour demand with a safety factor added.
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