Ensure that your patio heater receives the correct electrical power by using this Schwank JL-0776-XX transformer for a single patio heater when you install the unit. This transformer is intended for use with one patio heater and makes sure that your heater and its controller operate safely. It has a 4" x 4" electrical box mount design. 24V-40VA.Because this item is not stocked in our warehouse, processing, transit times and stock availability will vary. If you need your items by a certain date, please contact us prior to placing your order. Expedited shipping availability may vary. We cannot guarantee that this item can be cancelled off of the order or returned once it is placed. .