The ENERGY STAR website of the USA EPA provides detailed buying guidance
information for various types of imaging equipment.
Read more about the product type of your interest.
Printers: devices that can only print on paper from files on a computer or for some models also from other electronic devices such as digital photocameras or smartphones.
ENERGY STAR certified Printer Buying Guidance (PDF, 140 KB)
Multifunctional devices: devices that can print, copy, scan and for some models also fax.
ENERGY STAR certified Multifunctional Device Buying Guidance (PDF, 139 KB)
Copiers: devices that can only make paper copies from paper originals.
ENERGY STAR certified Copier Buying Guidance (PDF, 169 KB)
Digital duplicators: professional, fully automated devices for high-volume duplication from files or paper originals using stenciling techniques.
ENERGY STAR certified Digital Duplicator Buying Guidance (PDF, 150 KB)
Scanners: devices to scan paper originals into digital files on your computer.
ENERGY STAR certified Scanner Buying Guidance (PDF, 144 KB)
When selecting your printer, consider the cost-per-printed page. Very few vendors provide such an indication, but generally the cost of toner or ink may constitute 60 to 80 percent of the total cost of ownership. Calculating the cost-per-page in your own situation is very much dependent on the prices of paper and the ink/toner cartridge. Manufacturers of cartridges often provide how many pages can be printed with a single cartridge (page yield of the cartridge). The cost per printed page would then be: paper page price + cartridge price / page yield. This is of course a relative cost-estimation, because the page yield is measured using specific test pages (ISO/IEC 19752, ISO/IEC 19798 or ISO/IEC 24711), which may be very different than the pages you print.
For high volumes of printing, you may prefer products with a toner or ink tank. For low volumes, you may prefer generally cheaper printers using generally expensive cartridges.