koVOLT · COMING SOON ON KICKSTARTER
The smart plug that knows when electricity is green and cheap.
Your appliances run at exactly the right moment: when water, wind and sun are delivering the power and it is at its cleanest.
LOWER ENERGY BILLS · LESS CO₂ · ZERO EFFORT
Funded by the Vienna Business Agency
Developed in Vienna
Funded by the Vienna Business Agency
Your electricity price changes every hour. Your appliances have no idea.
The water heater fires up at 6 p.m. The tumble dryer starts the moment the washing is done. Exactly when electricity is at its most expensive.
Around 4.7 cents per kilowatt-hour.
That is the average gap between the daily average price and the cheapest hours. For a water heater (3.5 kW) using 5,110 kWh a year, that adds up to €239. Electricity is cheap when there is too much of it – and there is too much of it when wind and sun are delivering. So the cheapest power of the day is also the cleanest.
Basis: EPEX Spot 2022–2025, German market, cheapest hours versus 7-day average.
koVOLT® savings calculator

How much does your appliance save?

Pick an appliance and its daily runtime – we work out what you save on the exchange electricity price and how many kilograms of CO₂ you avoid each year.

Power: 3.5 kW

Consumption5,110 kWh / year
Kohle-/Gas-Mix0.60 kg CO₂ / kWh
Weniger CO₂ je kWh- 20.6 %

Water heater / hot water tank · Germany

Savings

€239.37

per year

CO₂ saved

632 kg

gegenüber Kohle- und Gasstrom**

* The figures shown are based on historical EPEX Spot data for 2022–2025. The calculation compares the cheapest hours of each day with the 7-day average of the week before. The difference is the saving, which is then added up across a full year. The annual savings were finally averaged. ** CO₂ comparison: a conventional electricity mix of coal and gas produces around 0.6 kg CO₂ per kWh. When your appliance runs during the cheap hours, the CO₂-neutral share in the grid rises by up to 22% – which corresponds to the CO₂ avoided per kWh. Based on the 2025 electricity mix data.

Lock in the best price at launch.
VIP reservations get our lowest Kickstarter price. Sign up now, no obligation.
One plug. Three things it does for you.
01
Fetches the prices
Every day, the exchange electricity prices for the next 24 hours.
02
Switches your appliance
On during the cheapest hours. Off the rest of the time.
03
Shows what you save
In euros and in CO₂. Every day, in the app.
What you need
A dynamic electricity tariff (e.g. aWATTar, Tibber) – without one, koVOLT saves CO₂ but no money
Wi-Fi and a Schuko socket
Exchange price access: €1/month, covers the data licence. Basic functions work without it.

Plug in. Set up. Save.
01
Plug in
koVOLT goes between socket and appliance. Wired up in ten seconds.
02
Set up
In the app: how many hours a day your appliance should run. That is all.
03
Save
From now on koVOLT finds the cheapest hours every day. All by itself.
As simple as a children's audio box!
Lock in the best price at launch.
VIP reservations get our lowest Kickstarter price. Sign up now, no obligation.
Funded by the Vienna Business Agency. wirtschaftsagentur.at
For everything that uses a lot and does not have to run right now.
This is what a single koVOLT saves per year – exactly as the app shows it to you.
Hot water
€239 saved per year
632 kg CO2 saved per year
4h / day · 3.5 kW
Fan heater
€136 saved per year
361 kg CO2 saved per year
4h / day · 2.0 kW
Pool pump
€75 saved per year
199 kg CO2 saved per year
4h / day · 1.1 kW
Bitcoin miner
€323 saved per year
865 kg CO2 saved per year
6h / day · 3.5 kW
Basis: EPEX Spot 2022–2025, German market, cheapest hours versus 7-day average.
In harmony with the environment!
koVOLT brings ecology and economy into perfect balance. Your appliance runs exactly when a surplus of renewable energy is setting the tone on the electricity market – water, wind and sun at their maximum. In those hours electricity is almost entirely CO₂-neutral and at its cheapest at the same time, occasionally even at negative prices. It does not get cleaner or cheaper than that.
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harmony
Runs locally. Built in Vienna.
Thomas Krickl
Founder & developer
Mechanical engineer, 20 years in product development, ten of them in toolmaking. He developed the electronics together with DI Martin Lenz, who brings 25 years of experience.
"Technology has to help people and make things simpler. The finest thing for me is making devices so simple that everyone can enjoy what the technology has to offer."
What you get is a product that experts have built with real dedication.
Sends nothing out of the box
Everything runs locally on your Wi-Fi. You decide in the app what leaves the house.
Encrypted to EN 18031-1 / -2
The microcomputer and the software inside koVOLT meet the current EU standards for connected devices.
CE to DIN EN IEC 60669-2-1 DIN EN 61058-1-2:2017-04 DIN VDE 0620-2-1/A1:2023-09
The required standards were agreed together with VDE Germany so that the European safety criteria are met to the letter.
16 A · 3.5 kW continuous load
Resistive load, Schuko CEE 7/7. Built for water heaters and fan heaters, not just for lamps.
Halogen-free PC/ABS-FR, IP20
Flame-retardant housing for dry indoor spaces. Safety tested at accredited institutes before delivery.
The best price goes to those who get there first.
VIPs get our lowest launch price. Everyone else pays more later.
Launching soon on
koVOLT, a product by TKTech e.U.
We believe we can make products that move people. And we believe that with our products, people can move the world.
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