European washing detergents have been enzyme based for 40 years, and these need low temperature fill.
US washing detergents are still mosly soap powder because they haven't considered energy efficiency until much more recently. Still large use of top-loaders which require lots of water, and the machines mostly can't heat the water themselves, because the larger quantity and lower power available from electrical outlets just doesn't work out. Front loaders have been appearing in the US over the last 10 years.