AS/NZS 4234:2008 PDF Download

The AS/NZS 4234:2008 standard specifies a formula for estimating how much energy heated water systems use. It offers a standardized method for assessing the annual energy efficiency of water heaters, including those that are electric, gas, solar, and heat pumps. The standard combines component performance test results with a mathematical model to calculate the standardized annual energy use.

The water heaters that integrate boosting or preheating into a traditional storage or instantaneous water heater are covered by this standard. Heat pump water heaters are also included. The standard also determines the displaced purchased energy in relation to reference water heaters for solar and heat pump water heaters. As 2984 can be used to obtain an annual performance evaluation where the applied standard does not include specific types of solar and solar assisted heat pump water heaters.

It is important to remember that the AS/NZS 4234:2008 standard does not contain any specifications for product design or operation. This standard's list of system operating parameters is intended only for performance modeling.