Plumbing Electric Blanket: This likely refers to an electric blanket designed to be placed on top of the mattress and under the sheets. It typically features electrical heating elements distributed throughout the fabric, providing warmth when plugged into an electrical outlet. The term "plumbing" might be a translation or a specific product feature related to how the heating elements are arranged within the blanket.
Single Electric Mattress Water Circulation: This suggests a mattress pad or topper that utilizes water circulation to provide heating. These types of products often include tubing through which warm water is circulated to generate heat. They may be controlled by a separate heating unit that regulates the water temperature. "Single" likely refers to the size of the mattress pad, suitable for a single-sized bed.
New Electric Heating Mat Double Plumbing Blanket: This appears to be a combination of features from the previous items. "New Electric Heating Mat" likely refers to a modern electric heating pad or mat designed to be placed on top of a mattress for warmth. "Double Plumbing Blanket" could indicate a larger-sized electric blanket (suitable for a double bed) with plumbing or water circulation features, similar to the single version described earlier.