1. What is a Commercial Water Heater Size Calculator?

Definition: This calculator determines the appropriate size (capacity) of a commercial water heater based on peak hour demand.

Purpose: It helps facility managers, engineers, and contractors select properly sized water heaters for commercial applications.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \text{Capacity} \) — Required water heater storage capacity (gallons)
• \( \text{Peak Hour Demand} \) — Maximum hot water usage during busiest hour (gallons)

Explanation: The water heater must have sufficient capacity to meet the maximum hourly demand of the facility.

3. Importance of Proper Water Heater Sizing

Details: Correct sizing ensures adequate hot water supply, energy efficiency, and prevents unnecessary equipment costs.

4. Using the Calculator

Tips: Enter the peak hour demand in gallons. This value should be determined by analyzing fixture counts and usage patterns.

5. Frequently Asked Questions (FAQ)

Q1: How do I determine peak hour demand?
A: Calculate based on fixture units (refer to plumbing codes) or measure actual usage in existing facilities.

Q2: Should I add a safety factor?
A: Yes, consider adding 10-20% to the calculated capacity for unexpected demand increases.

Q3: Does this account for recovery rate?
A: No, this calculates storage capacity only. Recovery rate must be considered separately.

Q4: What's typical for different business types?
A: Restaurants need 1.5-2.5 gal/seat, hotels need 10-15 gal/room, offices need 1-2 gal/person.

Q5: When would I need multiple heaters?
A: When demand exceeds 120 gallons, consider multiple units for redundancy and efficiency.