August 5, 2014, Irvine, CA Navien announces the introduction of the SmartZone+ zone pump controller line for use with all boiler products in residential applications. Available as 2, 3, 4 and 6 zone sizes and featuring an advanced built-in display with system status and diagnostics, the SmartZone + controllers are used as switching relays that allow for total customization of zoned heating systems. SmartZone+ is compatible with boilers (using TT contacts) and pumps of all manufacturers that are installed in multi-zone space heating applications. Multiple SmartZone+ controllers can be used to expand the number of zones up to a maximum total of 24. Additional features are DHW priority, purge time settings, freeze protection with indoor temperature sensor, manual pump control, automatic air purge, and advanced user modes for system customization.