Foley Mechanical — historic home enjoys mechanical upgrade

Share With:

Located in Bethesda, Md., the Seymour Krieger House is listed on the National Register of Historic Places, and was designed in the 1950s by internationally renowned modernist architect Marcel Breuer.


A very tight mechanical room displaying a Triangle Tube Prestige boiler, Grundfos ALPHA pump, Caleffi hydro-separator and REHAU radiant tubing and manifold.

The house currently is owned by an architect, and he wanted to restore the mechanical system while keeping the architectural integrity of the structure intact. Originally heated by a radiant floor heating system, the original boiler was still in place and operational, but the wrought iron radiant piping has corroded and was leaking in multiple locations.

“We discussed multiple alternatives,” says Dan Foley, Foley Mechanical, Inc. “But in the end, the owner decided to go back with radiant floor heat.

The bluestone floor tiles were painstakingly numbered and removed.  The concrete overpour, along with the original wrought iron radiant tubing, was removed.

New REHAU PEX radiant tubing system was installed, and a new concrete slab was poured.  The flagstones were carefully placed back in exactly their original positions.



REHAU PEX tubing


The entire mechanical system was updated by installing a new Triangle Tube Prestige boiler, HTP DHW tank, Viessmann solar heat and DHW system, Grundfos ALPHA pump, Caleffi hydro-separator, REHAU radiant tubing and manifold, and new Carrier high-efficiency AC system.


Four Viessmann flat panel solar collectors were mounted on the flat roof along with a Carrier 17 SEER AC unit.


To allow for multiple zones, Foley and his team re-piped and re-controlled the radiant system.  The Viessmann solar system will contribute to space heat when the DHW load is satisfied.


The old radiant pipe was removed to make way for the new tubing.


“The clients were a joy to work for and appreciated the hard work done by my crew on this difficult and challenging project,” says Foley.


The flagstones were carefully labeled so they could be returned to their original positions.

Join the conversation: