Cold water setting on my European washing machines (Miele, AEG) is 30 degrees Celsius/86 degrees Fahrenheit.
Far as one can see all versions of Tide cold water detergents are meant for wash temps of 90 degrees F. This is only ten or so degrees under "warm" which is 40 degrees Celsius or 104 degrees Fahrenheit.
Consumer Reports noted at the time that other versions of Tide including "Free and Gentle" worked perfectly well in warm water.
With above in mind greatest energy savings likely comes from reducing wash temps from 140F to boil temps. European detergents offer products rated for 20 degrees Celsius which is a very chilly 68 degrees F.
Personally would rather go with a detergent rated to perform across a range of temps rather than just "cold water" only. This if only because tap cold water temps in our neck of the woods varies. It is heavily influenced by outdoor weather and or say if boilers are firing for heat.
For things like making coffee or tea there are times one has to let taps run for what seems like ages to bleed out "warm" water for something relatively cold.
Both of our AEG washers are "tap cold fill" only and register complaints when say set to "cold" or "warm" and incoming water is sensed to be at or above set parameters. Good thing is that heater isn't engaged for long or at all. Downside is machines wipe out good portion of wash cycle time in response to not having to heat water.
My older Miele isn't bothered. Miele washers of old had "cycle guarantee" programmed in. If water temp either as incoming or heated reaches selected temp quickly all machine does is turn off heater. It will remain in heating mode however until timer tells it's time to move on.
Far as one can see all versions of Tide cold water detergents are meant for wash temps of 90 degrees F. This is only ten or so degrees under "warm" which is 40 degrees Celsius or 104 degrees Fahrenheit.
Consumer Reports noted at the time that other versions of Tide including "Free and Gentle" worked perfectly well in warm water.
With above in mind greatest energy savings likely comes from reducing wash temps from 140F to boil temps. European detergents offer products rated for 20 degrees Celsius which is a very chilly 68 degrees F.
Personally would rather go with a detergent rated to perform across a range of temps rather than just "cold water" only. This if only because tap cold water temps in our neck of the woods varies. It is heavily influenced by outdoor weather and or say if boilers are firing for heat.
For things like making coffee or tea there are times one has to let taps run for what seems like ages to bleed out "warm" water for something relatively cold.
Both of our AEG washers are "tap cold fill" only and register complaints when say set to "cold" or "warm" and incoming water is sensed to be at or above set parameters. Good thing is that heater isn't engaged for long or at all. Downside is machines wipe out good portion of wash cycle time in response to not having to heat water.
My older Miele isn't bothered. Miele washers of old had "cycle guarantee" programmed in. If water temp either as incoming or heated reaches selected temp quickly all machine does is turn off heater. It will remain in heating mode however until timer tells it's time to move on.
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