The reason for a lid lock is because there's no spin brake. It it is government safety regulation (IIRC, a full-speed spin must brake to a stop within 3 seconds, or else a lid lock is required) but has nothing to do with energy efficiency. Regards to water usage, the 2018 SQ toploaders can use plenty of water for washing per the videos I've seen.
The direct drive motor and stainless steel wash basket are backed by a 10-year limited parts warranty (Visit maytag.com for warranty details). Slow-close glass lid The slow-close glass lid offers a clear view of laundry and quiet, precision closing.
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