energy efficiency – How “eco” is the (3hr+) Eco mode on dishwashers – GWC Mag

Our domestic dishwasher has an “Eco” mode that takes around 3.5 hours to run. I presume that the time includes lots of resting time to allow the contents to soak.

However, I find it very difficult to believe that a machine operating for that long (and it seems to be doing something most times I walk past) saves water and energy when compared to the “Quick” (30 minute) mode, or even the 90-minute ‘Turbo Eco’ mode.

What is the rationale for calling the slow mode ‘Eco’ and are there any meaningful measurements / estimates around that give the relative energy/water cost for the different modes?

Details. I’m based in the UK. Our particular appliance is a UK-typical, under-the-counter, domestic one; a Bosch Exxcel model.