Tetra Countertop Dishwasher

The Plumbing-Free Countertop Dishwasher We’ve Been Waiting For

There’s not much innovation happening in kitchen appliances these days unless you count wifi connectivity or voice assist integration. That’s why Heatworks’ Tetra countertop dishwasher, which doesn’t require any plumbing, was so exciting when it was first announced…. in 2018. Three years later, you can finally pre-order one, but the wait isn’t over.

Tetra Countertop Dishwasher
Tetra Countertop Dishwasher

Space-efficient countertop dishwashers aren’t a new idea, but they’re often more trouble than they’re worth because they require upgrading the kitchen faucet with an adapter so the hot water hose can be temporarily plugged in every time you have dishes to clean. The Heatworks Tetra eliminates the need to connect the plumbing and hoses with a 3-litre water tank that you fill and empty every time you wash the dishes – about three sets of plates, cups and cutlery. If you live alone, or if you have a very small family, Tetra uses less water and energy than a full-size dishwasher or washing and rinsing a small number of dishes by hand in a sink.

All you have to do is clear space on a flat surface like a countertop or table and plug the dishwasher in but minimal installation requirements aren’t the Tetra’s only appeal. The dishwasher uses Heatworks’ innovative Ohmic Array Technology to heat the water in its reservoir. Instead of passing current through a submerged heating element that then inefficiently transfers heat energy to water, the Tetra works more like a microwave. Graphite electrodes pass a current directly through water to excite the minerals it contains, which instantly increases the water’s temperature. It’s a more energy-efficient approach and the technology can precisely control the temperature of the water the entire time. Traditional dishwashers don’t include a way to hear water because they instead source it from a home’s gas-powered water heater but ideally, we should all be trying to cut our dependence on natural gas as well.

Tetra Countertop Dishwasher
Tetra Countertop Dishwasher


Heatworks claims the Tetra “cleans 50% more dishes using 40% less water in 55% of the time than the leading dishwasher brand,” but that also depends on how often and how packed you run your dishwasher. The shortest cleaning cycle takes less than an hour to clean and dry dishes, while the standard mode pushes the cycle to a little over an hour before everything is ready to be put away. It’s not as fast as the 10-minute wash cycle initially touted along with the dishwasher a few years ago. There is undoubtedly still a benefit to its compact size and minimal water usage if you live alone or with a single roommate. Heatworks promises the Tetra can be used for other purposes, given how precisely it can control water temperature, like sterilizing baby bottles and kids’ toys, washing clothing, or even cooking foods like fish. Just be careful what order you do all those in.

The Tetra is finally available for preorder from Heatworks’ website for $400 but that’s a discounted price for early birds; the full retail price will be $500. It’s definitely a pricier alternative to existing countertop dishwashers that usually run closer to $300 and you’re going to need to factor in the cost of the Tetra’s proprietary detergent cartridges, too. Although Heatworks promises the cartridges to contain detergents so there’s less packaging waste and so the machine can create custom mixes of soaps and rinse agents on the fly for optimal cleaning, you’re still going to have to order replacements directly from the company after around 20 loads.

Pricing will be around 30 cents per wash or about $6 per cartridge, which is slightly more expensive than buying a bulk container of dishwasher pods. An accompanying app will provide advanced reminders when the current cartridge starts to run low, allowing users to reorder replacements easily but as anyone who’s grappled with inkjet printers and ink cartridges know, there’s always the chance you’re going to run out of detergent at the wrong time and you can’t just run to the grocery store to grab some. That’s possibly a dealbreaker for some but for those who don’t have the room for a full-sized dishwasher in their kitchens, it might just be a minor inconvenience if it takes washing dishes off the daily to-do list.

Let us know in the comment section whether you are thinking of buying the Tetra countertop dishwasher.

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