What is the difference between machine and equipment?

Machines are devices that need a person's attention when operating.

Equipment are devices that do not need this attention.

Examples: a refrigerator is equipment, a steel cutter is machine, a stove is equipment, a computer or a fax are machines; we call it anyway, "fax machine". Your car is machine/you operate it; your house, though, is "equipped with A/C and fan" because you do not pay attention to them when operating. The water heater is equipment. The pressure washer is machine, the air-compressor is equipment.