Understanding pump pressure that’s available vs. the required pressure Not pumping so hot Dan Holohan June 25, 2013 I was lucky to have had as one of my teachers the late, great Gil Carlson. Read More
Early radiant heating systems From Roman hypocausts to Chinese kangs to Levittown to the invention of PEX. Dan Holohan May 29, 2013 Each morning, when I sit at my desk, I give a moment’s thought to the broken copper pipe buried in the concrete slab just below my feet. Read More
Radiator Cover-Up A simple way of killing convection and radiation. Dan Holohan April 19, 2013 One of my yellowed heating textbooks has a wonderful drawing of a Victorian radiator that has what looks like a teapot cozy over it.Read More
Thank Denis A brief history of the steam pressure-relief valve. Dan Holohan March 15, 2013 A brief history of the steam pressure-relief valve.Read More
We Put the Fish in Efficiency What exactly is higher efficiency higher than? Dan Holohan February 13, 2013 My friend, Jenni, was visiting from Scotland and had never been to Central Park, so I took her there for a long walk, a ride on the carousel and some wine at the boathouse. We sat outside.Read More
Hydronic heating has come a long way, but system innovation continues Dan Holohan January 15, 2013 Twenty years ago this month, I wrote a column for this fine magazine titled, “Reaching for Higher Plateaus.”Read More
Vertical heating Dan Holohan December 1, 2012 Unraveling the mysteries of early 20th century high-rise steam-heating systems.Read More
The house by Cedar Hill Dan Holohan November 1, 2012 The early days of district steam heating systems in NYC.Read More
Old boiler room stuff Dan Holohan October 1, 2012 Use this list to troubleshoot old steam-heating systems. Read More
