Two 250-gallon Hot Water Tanks Are Replaced in Student Dormitory

When two 250-gallon domestic hot water gas direct-fired tanks begin to leak in a 25-story student dormitory SVA starts looking for a solution.

When two 250-gallon domestic hot water gas direct-fired tanks begin to leak in a 25-story student dormitory SVA starts looking for a solution.

Established in 1947, New York’s School of Visual Arts (SVA) has been a leader in the education of artists, photographers, film producers, designers and creative professionals for more than six decades. Comprised of more than 6,000 graduate and undergraduate students at its Manhattan campus and 35,000 alumni in 100 countries, SVA also represents an influential artistic community. When two 250-gallon domestic hot water gas direct-fired tanks began to leak in a 25-story student dormitory, the SVA turned to Paramount Plumbing, located in The Bronx, N.Y.

Paramount suggested using a parallel cascade of seven Bosch Therm 1210ESC’s, rated with a thermal efficiency up to 98 percent to solve their problem. The Bosch units were purchased through Solco Plumbing Supply of New York.

Installation Summary

Paramount specializes in new construction projects throughout New York City. The company is doing installation work at a Park Avenue residential building which, when completed, will be one of the tallest buildings at nearly 1400 feet tall.

Paramount’s Mike Salera described the challenges in this replacement.

“There were two 250-gallon direct-fired hot water tanks serving the 25-story building with hundreds of student residents. We had to replace the leaking old gas-fired units with seven Bosch Therm 1210ESC condensing tankless water heaters – with no interruption of hot water service.”

The leaking gas-fired units are replaced with Bosch Therm 1210ESC condensing tankless water heaters with no interruption of service.

The leaking gas-fired units are replaced with Bosch Therm 1210ESC condensing tankless water heaters with no interruption of service.


According to Jordan Stern from Marplat, a Bosch Manufacturer’s Representative in New York, “The customer had two direct-fired water heaters that were leaking due to expansion in the hot water system, and could not readily obtain replacement units. We were able to get the 1210 ESC units mounted on the wall while the leaking units adequately maintained hot water for the building. Once all the 1210 ESC units were piped and vented, Paramount Plumbing was able to remove the old water heaters and run the hot water system with the Bosch tankless units and the three existing 350-gallon indirect hot water storage tanks.” The Bosch units are connected to an Aquastat to maintain the hot water setpoint temperature automatically, with no special control wiring.

Benefits and Conclusion

Thanks to the slim profile of Bosch Therm tankless condensing units, Paramount was able to transport each unit in the building’s elevator to the rooftop mechanical room – without the use of a crane, as would be required with a large direct-fired water heater.

“Service was maintained throughout installation and the Bosch units now provide 100 percent of the building’s hot water needs,” adds Mike. “We’ve heard excellent feedback from the building owner and have had zero callbacks after two years in operation,” comments Jordan.

Project Name: School of Visual Arts, New York City
Wholesaler: Solco Plumbing Supply, New York City
Bosch Sales Representative: Marplat Company, Westbury, NY
Equipment Installed: 7 Bosch Therm C 1210 ESC tankless water heaters in parallel

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