Water Heating Systems

Today’s water heating technologies offer reliable, cost-effective solutions that can meet your facility’s unique needs.  Georgia Power invites you to explore the wide range of water heating solutions available to you.

Electric Resistance Storage Water Heaters

Electric storage water heaters are inherently more efficient than gas units. Unlike typical gas water heaters, electric water heaters have their elements immersed in the tank, so that the conversion efficiency is close to 100%. Known for their quick recovery times, these extremely common units also lose less heat and are better insulated than gas powered models. They come in a range of storage capabilities, making them an ideal option for facilities of all sizes.

Base-loaded electric resistance storage water heater

This storage water heater features one or two 500- to 3000-watt elements and an 80- to 120-gallon tank. The greater storage volume and lower wattage elements levels the electrical load, shifting demand from utility peak load hours to off-peak hours.

Instantaneous electric resistance water heater

Instantaneous water heaters have little or no storage capacity and heat water as it is needed with heating elements activated by a flow switch. Residential installations commonly have 6000- to 9000-watt heating elements capable of heating about one gallon per minute from 60 to 110º F. Commercial installations are available with much higher power ratings and are often custom built for the application.

Interruptible electric resistance storage water heater

The operation of this storage water heater’s elements is remotely controlled, typically by radio or power line carrier signal, to disable element operation during utility peak loads. Typical units use 4500-watt elements and a 50- to 80-gallon tank. Interruption periods are typically less than 4 hours.

Off-peak electric resistance storage water heater

To save energy and lower costs, the elements in this storage water heater unit are controlled by a timer or remote control device–such as a radio or power line carrier signal–that allows operation only during utility off-peak hours.  There are usually one or two elements with power levels from 500 to 4500 watts, and tank volume is typically 80 to 120 gallons.  The elements are typically prevented from operating for 2 to 12 hours.  Multiple tanks may be used.

Point-of-use electric resistance water heater

This storage water heater is installed near the point where hot water is used. The location reduces the time required to obtain hot water and avoids the use of a pumped recirculation loop and the associated high heat loss. Typical residential units use a 1- to 20-gallon tank while commercial applications usually call for larger units.

Quick recovery electric resistance storage water heater

The most common type of electric water heater in the United States, these models normally feature two 4500-watt elements, one upper and one lower, in a tank holding 50 to 66 gallons. The tank is usually made of steel and is lined with glass for corrosion protection.