Zip water heaters have proved themselves to be one of the best water heater manufacturers in the UK today. In HSDs experience Zip water heaters have proved their reliability and quality time and time again. HSD are an approved authorised retailer/dealer of Zip water heaters, what does this mean to you? If you have any problems what so ever with a Zip water heater you will have the full and ongoing support of both HSD and Zip Water Heaters. Zip water heaters are available on next day delivery with lowest prices guaranteed.