Technology – Heatworks has at long last opened pre-orders for the Tetra, a countertop dishwasher the company unveiled to some fanfare at CES 2018. Since the Tetra doesn’t require any plumbing, the only thing you need to connect it to is an electrical outlet. The appliance has a three-liter tank you fill with water manually. Once the cycle (which takes less than an hour on the shortest setting) is complete, you disconnect the greywater tank and pour out the used water.The dishwasher can wash and dry three place settings worth of dishes per load. On the surface, it might seem wasteful compared with cleaning those plates, cups and utensils manually, not to mention the counter space the machine will hog. However, Heatworks claims the machine requires less water than handwashing and rinsing the dishes. There are several settings, including a “fruit” one for washing produce. In addition, the dishwasher uses recyclable cartridges with concentrated detergent in an attempt to reduce waste.THE TETRA COUNTERTOP DISHWASHER PREORDER BEGINS NOW. Click to save $100 off the retail price. Limited quantities available. Reserve yours before they’re gone. https://t.co/KbSoDMZbw3#kitchen#home#mom#wine#RV#tech#water#sustainability#dishwatchingpic.twitter.com/xGfBZUoxo8??? HEATWORKS (@myheatworks) August 4, 2021The Tetra also requires less power than a standard dishwasher, according to the company. To heat up water, Heatworks uses Ohmic Array Technology, as Gizmodo notes. The Tetra takes a microwave-style approach to heating water rather than harnessing traditional metal elements. It uses graphite electrodes and “advanced electronic controls” to excite natural minerals in water. That setup allows the Tetra to efficiently heat water and maintain precise temperature control, according to Heatworks.While there are other countertop dishwashers that don’t need a plumbing connection, the Tetra has a smaller water tank than many of its rivals. Farberware’s FDW05ASBWHA model (which is currently $340) has a five-liter capacity. The Tetra may heat water more efficiently than other models as well.The Tetra will typically cost $499, but Heatworks is offering a $100 discount to those who lock in a preorder now. The detergent cartridges will cost around $6 each and they should be good for 20 loads depending on the setting and load capacity. Heatworks expects to start shipping the Tetra by May 18th, 2022, which is No Dirty Dishes Day.