Oil to gas conversion with installation of (2) new high efficiency condensing boilers and indirect hot water heater. 

Details of the installation: Viessmann Vitodens 200W with Weil McLain Aqua indirect hot water heaters. The system is operating on outdoor reset control. 

Property Type: 25 unit building 
Property Size: 3 buildings converted to 1, each was 7,400 sq ft for a total of 22,200 sq ft

Fuel: Gas
Boiler: Viessmann vitodens 200W with S Control for cascade control of the system. 

System: Hot Water (hydronic)

Video's from installation

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During installation: Working behind the existing boiler

During installation: Working behind the existing boiler

The process of bringing in a gas line from the main. Con Edison requests that the plumber install a sleeve up to the property line. Con Ed installs the gas line from street to sleeve. 

Working around the existing system to ensure no interruption of heat or hot water during the conversion: