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St. John opened Pizza of Venice with Jamie Woolner in 2013, cooking pizza out of a convection oven with just two tables and six chairs.

The mountains trap hot air and circulate the heat like a convection oven.

Bush, for example, recently listed a Montague Co. convection oven for $9,500 — far below its original price of roughly $21,000.

Revolution Cooking’s $1,800 “macrowave” combines a microwave with a convection oven but such trendy gadgets are typically short-lived and encourage people to trash the simpler appliances they already have, according to Shanika Whitehurst of Consumer Reports.

Dehydrators remove water by exposing ingredients to low heat while keeping air circulating throughout, much like a convection oven but at a temperature that doesn’t actually cook them.