1. What is a 10 GPM Electric Tankless Water Heater?

Definition: This calculator determines the number of 10 GPM electric tankless water heaters needed based on your total hot water demand.

Purpose: It helps homeowners and plumbers properly size electric tankless water heater systems for large demand applications.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Total flow rate (gallons per minute)
• \( Q_i \) — Flow rate of each fixture (GPM)

Explanation: The flow rates of all fixtures are summed, then divided by 10 GPM (capacity of one unit) to determine how many units are needed.

3. Importance of Proper Sizing

Details: Undersized systems lead to cold water sandwiches and insufficient flow. Oversized systems waste energy and money.

4. Using the Calculator

Tips: Enter the flow rate for each fixture in GPM. Typical values are pre-filled but can be adjusted for your specific fixtures.

5. Frequently Asked Questions (FAQ)

Q1: Why 10 GPM units?
A: 10 GPM units are common for large homes or commercial applications where multiple fixtures run simultaneously.

Q2: What if my total is slightly over 10 GPM?
A: The calculator rounds up, so 11 GPM would require 2 units for proper performance.

Q3: How do I find my fixture flow rates?
A: Check manufacturer specs or measure flow by timing how long it takes to fill a gallon container.

Q4: Does this account for temperature rise?
A: No, this calculates flow rate only. For cold climates, you may need additional capacity.

Q5: Can I install multiple units myself?
A: Professional installation is recommended due to high electrical demands (often 240V circuits).