WTHA1NP Weller WTHA1 Promo W.522N & E7SA 120V B NA. Weller continues to explore new product global frontiers, expanding its reach to automation and connectivity, while giving old favorites fresh new looks with enhanced functionality. Ever in close dialog with our customers, we’ve now segmented our Professional products into Performance, Technology, and Efficiency lines, to provide optimal solutions for every customer level. Keeping the user’s health and work-flow top of mind, we’ve integrated filtration, ergonomics, traceability and connectivity with Weller’s signature soldering precision and efficiency. Weller continues to explore new product global frontiers, expanding its reach to automation and connectivity, while giving old favorites fresh new looks with enhanced functionality.