water boiler with patent technology
US4419567A – Heating element for electric water heater – Google Info: Patent citations (7); Cited by (20); Legal events; Similar documents; Priority and This invention relates to electric water heaters and, more particularly, Electric water heaters typically include one or more heating elements, each of US6432344B1 1994-12-29 2002-08-13 Watlow Polymer Technology Method of Water heating […]