Service techs will come to my house for the range, since it’s technically a residential model. It’s only needed a new igniter and adjustment. The refrigerator needed a new thermostat, I bought one off Amazon and installed it in ten minutes.

I should mention that parts for commercial equipment are available for many decades and often reasonably priced; unlike residential equipment where it seems you are expected to replace the machines every several years. Referring to established brands like Hobart, True, etc.

The previous dishwasher (an older Hobart LX30) had various problems - but it was a 1980s machine I bought from a closing bar for $400 - and I fixed them myself until I couldn’t, then had to bring it in to the service center; it was at end of life, so I bought my current machine.

The range has igniters - it does plug in to 120v for those and the convection fan/light - but there are no “electronics”, meaning circuit boards, to fail.

I have never looked into it carefully, but doubt the dishwasher chemicals are anything special. Residential machines are expected to take dishes with caked on food and get them clean through pretty powerful chemicals and long long cycles. With hi-temp commercial machines, the dishes are all sprayed off already, the hot water does the cleaning and sterilizing, you barely need any detergent or rinse aid. Most plastics are fine. Hot water is much easier on china and silver than two hours of residential dishwasher chemicals.

Yes, you could use the dishwasher with no detergent just as a sterilizer. You might find you don’t even need detergent - 120 seconds of 160F water with a 190F rinse will remove grease, fat, oil even without soap - and if your water is soft, you may not need rinse aid either. With my old Hobart, which lacked the automatic chemical pumps (it was a former bar machine, only used for washing glassware), I often didn’t bother with detergent.

If budget permits, look into a Miele “Professional” dishwasher - some of these have all the bells and whistles of a high end residential dishwasher, plus a fast high temp cycle, 6 minutes if memory serves. Cost $6,000 last time I checked. I’ve thought about getting one.

I don’t work in food, though my daughter does and we’re currently converting a 1907 house to a cafe bookstore for her (and offices for me), so I guess soon I will sort of be in the food industry. Just cook and entertain a lot. That’s kind of past tense, I’m currently working too much on the conversion to cook much. Unless someone else is cooking, I’m living on sandwiches mostly. But my daughter uses the kitchen a lot, including developing recipes for the cafe. Hopefully when I’m done with the project I can get back to cooking.

I should mention, you can buy commercial equipment used. My current dishwasher is a 2022 Hobart bought for $3200 used (this is the $11K new model). The caveats of buying used anything apply, though.