Like most of the rest of the world, here at RFE HQ we are spending a little more time at home due to the threat of COVID-19. This has given me some time to take a few photos and videos, and I hope to get some more posts going soon! Before I walk down the hallway to my day job, I make a little coffee, or sometimes tea.
One of the tastiest ways to make coffee is in a Sunbeam CoffeeMaster C30 version B (I’m sure it’s better than the version A, but I have no idea how). The Sunbeam CoffeeMaster only allows water at over 200 degree Fahrenheit to rise to the top bowl, via it’s innovative vapor hole!
This coffeemaker makes a quite nice cup of coffee, unlike modern drip coffee makers this one sloshed the grounds about in almost all the water for a good couple of minutes. These are sometimes called vacuum coffee pots, in the theory that the bottom chamber cooling “sucks” the water back down from the top. No doubt there is a little of this, but the top pot is vented, so the majority of the action is done by gravity.
These pots do operate on pressure, the rubber ring between the two pots is often bad if you’ve bought one at a thrift store or eBay, luckily a company still makes replacements. You can also find replacement seals on ebay. Many folks get theirs from dayseal , they have a good reputation on the internet.
Once you have made sure your unit has a good seal the operation is rather simple. A heating element at the bottom boils the water, the steam pressure at the top of the bottom unit pushes down on the water and forces it up the tube. Once the bottom is nearly dry a sensor detects the temperature goes above 212F (100c) and switches to “keep warm”. Once there is no longer steam pressure to keep the water in the top unit, and a little because of the cooling vacuum, the water drains down from the top unit to the bottom. A metal filter catches all the coffee grinds and keeps them safely in the top. I created a video of the whole process here: