EZ Setup Wizard – programming your boiler has never been easier;Remote Monitoring and Diagnostics – remote access for programming and troubleshooting;Easy-to-read full color graphics;Top and Bottom plumbing connections for easy installation;Built-in Low Water Cutoff, saving time and money;120v convenience outlet;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)