Frame Warranty:
Most manufactures will offer a lifetime warranty on the frame. The most common frame failures are due to bad welds, at the same time frame failures are very uncommon due to quality assurance procedures typically used by all treadmill manufacturers.

Motor Warranty:
Motors commonly carry a lifetime warranty. Motor failures are not common on home use treadmills. Most motors can easily operate for more than 1,000 hours. It would take you 10 years, at 2 hours consistently a week, to reach 1,000 hours on your treadmill.

Parts Warranty:
The parts warranty is probably the most important as the parts warranty includes anything besides the frame and motor. Items commonly covered by the parts warranty are belts and rollers. Belts and rollers are the most common items to wear out on a treadmill. Decent treadmills will usually offer a 2 year, or more, warranty on parts.  Stay away from parts warranties that are less than a year.

Electrical Warranty:
Electrical failures used to be uncommon on treadmills. Electrical components typically consist of circuit boards and wiring, these items have a low failure rate. Some of the higher end treadmills offer an increasing array of gadgets that may be covered under the electrical warranty.  Make sure you understand what is covered in the electrical warranty when purchasing treadmills with LCD televisions and/or wireless heart rate monitors. Electrical warranties usually range from 1-2 years.

Labor Warranty:
Labor warranties usually define in-home repairs. A good example of a labor warranty is in the case of failed belt. For this example we will use a labor warranty of 1 year and a parts warranty of 2 years with a belt failure after 14 months. In our example the manufacture would replace the belt, but it would not cover the labor to install the replacement belt. Labor warranties are probably the most important warranty to consider if you are not mechanically inclined. Labor warranties usually range from 1-2 years.