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The Correct Water Heater Matches Application and Requirements

When choosing the correct water heater, you must take into consideration that all water heaters are designed for a particular application based upon certain requirements.

Guidelines & Criteria To Consider

Whether electric or gas, a water heater must be capable of generating enough hot water at least 120 degrees F for residential applications and up to 180 degrees F for commercial applications to meet demand. Each state and many localities have “codes” or requirements that must be met. The purpose of these guidelines is to provide criteria that all architects, contractors or homeowners must use to adequately meet the anticipated hot water demands.

  1. One of those requirements is called “Peak Performance”. Peak performance is found by adding the gallons per hour use of all fixtures that utilize hot water together.
  2. Voltage is another requirement If an electric water heater is desired.  Depending upon what line voltage is available at the electrical panel, the water heater will be rated at that voltage.
  3. Most residential applications will utilize a 240-volt, dual element water heater.
  4. In point of use, under the counter single sink applications, 120-volt, single element water heater is widely used.
  5. In commercial applications, 208, 240, 277 or 480 volt, 2, 3, 6 or 9 element water heaters are generally installed.
  6. Wattage is another requirement if an electric water heater is needed. The formula for wattage is Voltage X Amps.
  7. In a natural gas or propane gas application, the peak performance will be used to figure the BTU rating required. BTU stands for British Thermal Unit and is the quantity of heat required to raise the temperature of one pound of water one degree Fahrenheit.

Many Water Heater Choices

There are several types of water heaters that can be utilized. The most common is storage tank type water heaters, Instantaneous (tank-less) water heaters that generate hot water on demand and booster heaters that are widely used to quickly boost water heater temperature to 180 degrees F for sanitizing purposes.

The Proper Way To Connect Multiple Water Heaters

When more than one water heater is connected together, most codes specify parallel connections and not series.

I wish you much success!

“Keeping you in hot water…so you stay out of hot water!”

Doug Wallingford