Eco cycles wash at a lower temperature, but for a longer time period. This saves energy because it takes far less electricity to run the pump/motor than it does the heating. Switching to a lower-temperature eco wash could yield an energy saving of 35-59% according to a report from the University of Surrey
However, using an eco mode on a 60C wash makes no sense though as most washes are cleaned at 30C, so only use a lower them cycle eco mode if you want to save energy. And be mindful that “eco” is not a defined standard, and it is open to abuse from manufacturers. There are examples where an eco button yielded a saving of only 1%. More about that in this article
Manufacturers should include a breakdown of kWh/water/time consumption in the appliance’s manual as required under EU Commission regulation 1015/2010 implementing directive 2009/125/EC
, but unfortunately (1) only 40C/60C cotton cycles are required to be provided, (plus standby power consumption), (2) the tests are done in a lab environment and (3) manufacturers are allowed to make changes to the tech specs after the tests without needing to retest..
For my power consumption measurements of individual appliances I use Sonoff Pow R2 smart switch meters (£11-12 off eBay) which I wire in a 50cm extension lead from CPC. The benefit is that they are WiFi enabled, and under-worktop appliances often have power sockets in hidden places where a power meter with display isn’t very practical. I leave my power meter switches in situ for long periods and track consumption via the ewelink smartphone app. Here is a sample screenshot of my dishwasher...
Originally Posted by Suz