Coffee Roasters

Coffee roasters - the mechanical device (Coffee roasting machine), not the human profession - come in all shapes and sizes. Prices range from a few dozen dollars to nearly a thousand.  Of course, as with any manufactured product, price doesn't necessarily correlate exactly with quality. Beyond looking to a reliable brand, here are a few tips about what to look for, based on your goals.

How much involvement do you want?

Some people just have a bit of the chemist in them. They like to mix and stir, whir and measure. Roasters vary along this dimension. Some simple stove top models are basically just a sauce pan with a tight lid and a special handle.

The handle contains a crank that allows the roaster to stir up the beans during the process. Stirring is essential to keep the beans from burning on the bottom as well as to keep the hot air inside circulating evenly.

Even in this simple set up, be sure to look for ones that have a thermometer in the lid. Temperature control is important for proper roasting.

At the other extreme are coffee roasters that do it all for you. Pop in a pre-determined volume of green beans from a bag, close the lid and walk away for a few minutes.

These deluxe models have inbuilt thermometers, thermostatically controlled heating mechanisms, clever air-flow control geometry and rotating canisters and a timer to automatically shut off the device at the proper time.

At the upper end of the price range, these rocket ship roasters do everything but eliminate the smoke that invariably accompanies the process.

How effectively do they heat and circulate air?

The most common type are air roasters that work more or less like a popcorn popper. Hot air is circulated throughout the mixture, while the beans are agitated. This gives a uniform roast and some models can even filter out the chaff produced as the skins burst from the expansion of the bean.

Most allow you to watch the process through a glass exterior, to judge the degree of desired roast. Frequently they have pre-set amounts on the dial ranging from light to dark.

The ability to circulate air evenly and heat uniformly is critical and designs vary in the degree to which they meet these goals. For example, a roaster with a heating source only at the bottom and constricted air flow is going to provide an uneven roast.

Drum roasters help overcome this problem, by providing a rotating drum that uses gravity to move the beans around, rather than relying solely on a stirrer at the bottom.

Beware, though. Many don't have windows for observing the roasting process - a must for those who like to experiment and fine-tune the roast. And, not surprisingly, with the greater quantity of bean comes a larger volume of smoke. Be prepared to ventilate well.

Once confined to more professional use, home devices are now readily available and have the added benefit of being able to roast larger quantities. Useful for those large dinner parties where you want the freshest possible coffee. And who doesn't want that?