Plumbing & Mechanical columnist and hydronics expert Dan Holohan will present his “Classic Hydronics” seminar May 20, 2015, during the National Association of Oil & Energy Service Professionals conference in Hershey, Pa. Holohan and OESP will donate all proceeds from this seminar to a grant for industry teachers.

Holohan will retire from teaching in 2016, so this is an opportunity to learn from one of the industry’s most informative and entertaining teachers. Sharpen your troubleshooting skills while supporting the future of industry education.

“This all-technical seminar will give you a liberal arts education in classic hydronic systems,” Holohan said. “You will see inside the pipe and get a better understanding of how things work, what goes wrong and why. I’ll share with you the secrets I’ve picked up from the Old Timers, making you a better troubleshooter.”

This class explores one-pipe loops, the critical importance of pressure differential, gravity hot-water heating, pumping, radiation, one- and two-pipe primary-secondary systems, two-pipe direct and reverse return, classic radiant, multiple boiler systems, diverter tees, two-temperature systems, air problems and their solutions, and more.

Visit to register. This seminar is $99 per person. Class size is limited and this one sells out quickly, so reserve your spot today.