Our WarmFlo Select plenum heater makes ordering and installing a WarmFlo plenum heater easier than ever. We have integrated the control and interface modules into one discrete system which includes all of the features and flexibility of our WarmFlo II plenum heaters. In other words, you no longer have to worry about which interface module or chip code you need whether you are installing the plenum heater in conjunction with air conditioning, without air conditioning, or with a single stage heat pump.