Domestic Water Heating – Minimum Efficiencies
{"Image DocumentName": "Domestic Water Heating \u2013 Minimum Efficiencies", "Image ImageDescription": "Domestic water heating equipment shall be ENERGY STAR qualified, where applicable. Minimum Efficiencies: Hot Water Supply Boiler (oil or gas): 85% Et. In-Unit Storage or Instantaneous: Gas (EF): 0.69-(0.002 x Tank Gallon Capacity) Electric (EF): 0.97-(0.001 x Tank Gallon Capacity) Domestic water heating equipment shall be ENERGY STAR qualified, where applicable. Not all systems found in multifamily high rise buildings are eligible for the ENERGY STAR label, since that program tends to apply to residential equipment used in single family homes. Where available, they should be ENERGY STAR qualified. Minimum efficiencies are therefore established as follows: For hot water boilers, gas or oil-fired, in-unit or central, the minimum efficiency allowed in the Prescriptive Path is 85% Et. For in-unit tankless or storage water heaters, these equations determine the minimum efficiency. For example, a 50 gallon gas storage water heater must have an energy factor of at least Since storage water heaters are readily available as ENERGY STAR qualified, this minimum will generally be exceeded due to the higher criteria for ENERGY STAR qualified water heaters. To determine minimum efficiencies for tankless systems, use 1 gallon for Tank Gallon Capacity.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}