Standard 206 provides a uniform method of testing for rating the seasonal efficiency of multipurpose heat pumps that perform space conditioning and water heating in residential applications. This procedure pulls together past test procedures and U.S. Department of Energy waivers dealing with special design equipment into a single comprehensive procedure covering all existing and anticipated multipurpose heat pumps. It covers six different basic systems: single capacity air-source, dual capacity air-source, variable capacity air-source, single capacity liquid-source, dual capacity liquid-source, and variable capacity liquid-source systems.

Purchase of this standard includes Web-based access to the Combined Appliance Performance Calculation Spreadsheet to assist in calculations for the procedure (I-P only. Requires Microsoft Excel.).