I was fortunate to have had the late, great Gil Carlson as one of my teachers.
In this book, I\'ve used what Gil taught me to show you how to reduce the size of your pipes, valves, fittings and pumps, and how to lower heating system temperature, and a.
That\'s a shame because guesswork costs both time and money.
Over the years, I\'ve watched a lot of trial and error with Primary-Secondary heating systems.
He invented Primary-Secondary Pumping in the early \'50s and went on to do many other things.
I was fortunate to have had the late, great Gil Carlson as one of my teachers