1. What is a Marey Tankless Water Heater Calculator?

Definition: This calculator determines if a 3.1 GPM Marey tankless water heater can meet your household's hot water demands.

Purpose: It helps homeowners and plumbers size tankless water heaters appropriately based on fixture flow rates.

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 individual fixture

Explanation: The calculator sums the flow rates of all fixtures that might run simultaneously to determine if the 3.1 GPM heater can handle the load.

3. Importance of Proper Sizing

Details: Undersized heaters lead to cold water surprises, while oversized units waste energy. The 3.1 GPM model is ideal for small households or point-of-use applications.

4. Using the Calculator

Tips:

• Enter the number of fixtures that might run simultaneously
• Input each fixture's flow rate (typical values: shower 1.5-2.5 GPM, faucet 0.5-1.5 GPM)
• The calculator will sum the flow rates and recommend if the 3.1 GPM model is suitable

5. Frequently Asked Questions (FAQ)

Q1: What fixtures can a 3.1 GPM heater support?
A: Typically 1-2 low-flow fixtures simultaneously (e.g., one shower + one faucet).

Q2: What's the temperature rise capability?
A: The 3.1 GPM model provides about 45°F temperature rise at this flow rate.

Q3: When should I consider a larger model?
A: If your total flow exceeds 3.1 GPM or you need to run more fixtures simultaneously.

Q4: How do I find my fixtures' flow rates?
A: Check manufacturer specs or measure with a bucket and stopwatch (gallons collected / minutes).

Q5: Does this include whole-house applications?
A: No, the 3.1 GPM model is best for point-of-use or very small households.