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What do the symbols in the sizing map represent?

Represents a standard hand sink that emits 0.5 gallons per minute according to 2010 Plumbing Standards. Represents 1/2 the flow rate of a standard hand sink. Imagine this represents only opening the faucet half way.
Represents a 1.5 gallon per minute water saver shower head.  Represents 1/2 the flow rate of the 1.5 gallon per minute shower head. Imagine this represents only opening the faucet half way

 

 

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How does the sizing map work?

Choosing the right model of electric tankless water heater for your home or business depends on (3) primary factors: Incoming water temperature, maximum desired flow rate and electrical service.  The map provides the maximum achievable flow rate for each model based on the inlet water temperature of your area displayed at the top of the chart.  Incoming water temperatures are an estimate based on average climate conditions.  The outlet temperature is set to 105°F, the average showering temperature. The difference  between the inlet water temperature and the outlet water temperature is the temperature rise, which determines the amount of water you will be able to heat at one time, represented in gallons per minute.  Each plumbing fixture in your home emits a certain amount of gallons per minute.  The symbols to the right of the chart give a visual representation of the most common household fixtures for hot water, showers and sinks, that can be used at one time with each model.   Even if your area is not specifically represented within the map, you can find your inlet water temperature with a simple digital thermometer.  Once you have this information you can find an area with similar inlet water temperatures to determine the flow rates for your area.

Follow this link to learn more about the physics of heating water.

Follow this link to see the flow rates for other common household plumbing fixtures.

Knowing the capacity of each model and choosing the correct one is essential to ensure desired results. If you have any questions or would like assistance in selecting your tankless hot water heater please do not hesitate to contact us toll free at 877-474-6473 or by email by using our contact us form. We are happy to assist you.



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