I have used my Kärcher device only once, but because I needed all its power to clean a wall covered with soot, I do not regret being mounted to K5 model, which confirms that the high-pressure ranges below cleaners are extra devices. Eco mode is useful for areas that do not require the full power (20% of water and electricity consumed), but its greatest advantage is the possibility to tap into a water tank. So just dive into the hose supplied, making the purchase optional extra tight connection for a tap. Two complaints that being said: the suction power is low (need to limit the highest point of the tank unit's fetching while filling the water hose before connecting y) and the inevitable purchase Filter 4730-059 of water plus if you want to preserve the pump. Given all the debris that the filter retained after use, it should be provided with basic Ecologic models. Finally, I bought it to enjoy the ODR reimbursed 50 + 80 available accessories, making it a very good deal. I just give a yellow card for Amazon to the fact of having no bill included in the package received by mail or its duplicate what I asked for 20 days service, forcing me to print it, not without sentence.