Water Heater Rating Improvement Act of 2009

[AI summary unavailable — showing source text] Water Heater Rating Improvement Act of 2009 - Amends the Energy Policy and Conservation Act to require the Secretary of Energy to publish a rule that establishes a uniform efficiency descriptor and accompanying test methods for water heaters, storage water heaters, instantaneous water heaters, and unfired water storage tanks (covered heaters). Requires: (1) the efficiency descriptor and accompanying test method to apply to all water heating technologies in use and to future water heating technologies; and (2) the efficiency descriptor to be the efficiency standard for covered heaters. Sets forth provisions concerning a mathematical conversion factor for converting the measurement of efficiency for covered heaters from the test procedures in effect on the date of enactment of this Act to the new energy descriptor. Authorizes the rule to exclude a specific category of covered water heaters from the uniform efficiency descriptor if the category of water heaters: (1) does not have a residential use and can be clearly described; and (2) are rated effectively using the thermal efficiency and standby loss descriptors applied to the category. Requires the Secretary, in establishing the rul…