Water Heater Ratings

water heater
a heater and storage tank to supply heated water
Water heating is a thermodynamic process using an energy source to heat water above its initial temperature. Typical domestic uses of hot water are for cooking, cleaning, bathing, and space heating. In industry, both hot water and water heated to steam have many uses.
An appliance for supplying hot water for purposes other than space heating or pool heating.

ratings
(rating) military rank: rank in a military organization
An angry reprimand
(rating) evaluation: an appraisal of the value of something; "he set a high valuation on friendship"
(rating) standing or position on a scale