None of the "washlet" toilet attachments need a hot water line. They have built-in heaters and heat the water coming in from the cold water line. Whole-house b

None of the "washlet" toilet attachments need a hot water line. They have built-in heaters and heat the water coming in from the cold water line. Whole-house battery backup is a modern marvel, too. (We have 80KWH of stored battery capacity and it shifts grid load to non-peak hours to save huge amounts of money.)