As director of engineering for the Boston Marriott Cambridge, Robert Vass knows that each mechanical decision he makes for the hotel has 431 opportunities to fail. That’s the number of guestrooms at ...

In hydronic heating, to control where heated water goes to various sections of a building, the system might rely on two or more zone valves. A zone valve opens or closes based on demand from a ...

Hover over main image for caption information. A typical oil fired forced hot water heating system, installed in 1980 was ready for replacement. The original boiler room equipment was removed, which ...