The 3rd edition of the textbook Modern Hydronic Heating- For Residential and Light Commercial Buildings, by John Siegenthaler, P.E. (released January, 2011)

"Never thought it was possible to make it any better but industry colleague John “Siggy” Siegenthaler, P.E., steps up his latest edition with current information, photo’s and new mechanical, electrical and architectural illustrations not found in other design text books. Updated are numerous resources including list of key words, sample questions and exercises with suggested reading material for further studies. Also new is a wide range of simple and useful formulas that should be part of every person’s tool kit. If you’ve been looking for an all-in-one resource addressing the power of integrated modern hydronics including practical real world applications for geo and solar thermal systems – it’s time to donate away those dozen antiquated books for this single source one of a kind instruction manual that will serve educators, students, designers and trade persons well into the future of high performance hydronic systems."

Robert Bean, R.E.T., P.L.(Eng.)
Journal of Indoor Environmental Quality Editor

System Showcase 2011

Congratulations to the 2011 System Showcase Winners

See the full results here.

Combined Membership

The Radiant Professionals Alliance and the Hydronics Industry Alliance have joined forces... Click here to see what this new combined membership will bring you.

Hydronic Definitions

Visit the Hydronic Definitions page to look up terms related to our field. You find the complete reference... HERE