Toss the chopped bacon in a skillet and cook until almost done (do not fry too crispy), stirring occasionally. Drain bacon on paper toweling then place in slow cooker or crock-pot. Add the beans, water, onion, garlic, maple syrup, molasses, salt, dry mustard, pepper, bay leaf, and tomatoes. Place lid on the cooker and cook on low approximately 8 hours. Be sure to remove bay leaf before serving.