Possible Clues:

• Washhouse
• One having a row close to pantry in part of kitchen
• Sounds like Cox keeps an eye on it off the kitchen
• Room for storing cookware
• Oarsman with Yankee in room by kitchen
• Room attached to a kitchen
• Rower hitting front of yacht sinks here, maybe
• Room in large old house next to the kitchen
• Dishwashing room at Downton Abbey
• Where dishwasher went cruelly wrong after last of rinses