27 Sep '11, 5pm

Glossary of Heating, Ventilation and Cooling Terminology #home #energy

The maximum water usage, in gallons/hour, during the time of day when a family is likely to use the greatest amount of hot water. First-hour rating The ability of a water heater to meet peak-hour demands. It measures how much hot water the heater will deliver during a busy hour. The first-hour rating accounts for the effects of tank size, and how quickly cold water is heated. Standby losses Storage water heaters constantly loose heat by conduction through the walls of the tank, and through the first few feet of water pipes. To reduce standby losses, insulate the tank, the first two feet of the cold water inlet pipe, and the first three feet of the hot water outlet pipe. Energy Factor The efficiency of storage water heaters is indicated by its Energy Factor (EF), which is based on an average hot water consumption of 64 gallons/day. The higher the EF, the more efficient the ...

Full article: http://hes.lbl.gov/consumer/resources-glossary

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