EZ Setup Wizard-programming your boiler has never been easier;Remote Monitoring and Diagnostics-remote access for programming and troubleshooting;Top and Bottom plumbing connections for easy installation;Built-in Low Water Cutoff, saving time and money;Built-in zone control-up to 3 Heating zones plus Domestic Hot Water (Expandable to six heating zones using the optional N-Link Zone Expansion Module - part 87633-1);Easy-to-read full color graphics;120v convenience outlet