We boil quite a lot of tea, fruit tea and coffee. I bought a 1 kW Travel Kettle to replace my large 2 kW kettle.
This means that, during the day, whenever the system is generating less than 2 kW (quite a lot of the time), I save money and CO2 as, although the kettle takes longer to boil at 1kW, it uses more of my solar power and less of the power from the mains.
The savings can be significant.
I had the idea after putting a consumption meter on my kettle socket and finding out that, given energy saving bulbs etc., much of our electricity usage was the kettle.