The ratings for microwaves’ magnetron tubes allow for between 3,300 and 3,800 hours of use. Typically, when these units’ three-year warranties expire, the tubes are at the end of their service life.

Depending on how often the unit is used, microwave ovens can operate for as long as 10 years.

Before purchasing a new microwave, operators should consider a number of factors, including:

• Establish what type of items the unit will cook before deciding on the size and power needs.
• Determine the size of the cooking vessels necessary to prepare the various menu items in the microwave to make certain the unit can accommodate them.
• Make sure the operation’s utilities can support the oven’s voltage requirements.
• Figure out how fast the cooking process needs to be and the appropriate wattage. Keep in mind that bulk defrosting requires a higher wattage.
• Consider how often staff will use the oven – that will impact where to place the unit in the kitchen.
• Look at the unit’s warranty. Many heavy-duty commercial microwave ovens feature a full three-year warranty, while light- duty models typically provide a one-year warranty.
• Does the menu warrant a microwave that can store cooking programs? If so, also consider a model that offers stage cooking or a multiple quantity option.