John Siegenthaler, P.E.

John Siegenthaler, P.E., is principal of Appropriate Designs, a consulting engineering firm in Holland Patent, N.Y., and author of the text “Modern Hydronic Heating.” Visit for information on new software for hydronic system design and documentation. John is also the contributing editor to PM's monthly "The Glitch & The Fix" column, which offers hydronic troubleshooting solutions in conjuction with the magazine's twice-monthly Radiant & Hydronics eNews newsletter. You can reach John by e-mail at

Beginning on February 17, 2014, John will continue teaching his online course titled “Mastering Hydronic System Design,” in partnership with BNP Media and HeatSpring Learning Institute.  Details are available at


10 lessons I learned in hydronic heating

Don’t make the same hydronic-heating mistake twice.

Some came as the result of improved technology. Others were learned through the school of hard knocks.

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Here are some ways to combine solar collectors and wood-gasification boilers.

In many parts of the U.S., the summer of 2013 was a banner season for solar energy collection. Many solar thermal systems, especially those in the over-baked western part of the country, undoubtedly collected enough heat that they reached the upper temperature limit of the storage tank and had to dump excess heat.

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There is a need for year-round controllers for radiant ceilings

Somebody, please make this…

Hydronic heating has long been known for providing superior cold weather comfort. Even so, a question that often comes from a potential client — one who has already been convinced of the benefits of hydronic heating — is, “What about cooling?”

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Geothermal heat pump systems with manifolded earth loops may offer many advantages

Less time in the trenches.

Most residential geothermal heat pump systems use closed-earth heat exchangers constructed of high-density polyethylene tubing. The overall earth heat exchanger usually consists of several parallel piping circuits joined into a set of headers.

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Future-Proofing Hydronic Systems

Low water temperatures are the key.
There has always been a tradeoff between the water temperature at which hydronic heat emitters are sized and their cost.
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Minitube distribution systems

You can save big bucks on those large heated slab jobs.
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Hydronics Is The “Glue”

This is what holds together almost all thermally based renewable energy systems. 
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BNP Media's Plumbing Group Visits Grundfos North American Headquarters

BNP Media’s Plumbing Group, comprised of the Plumbing & Mechanical, Supply House Times, PM Engineer (pme) and Reeves Journal brands, recently visited Grundfos’ new North American headquarters building in the western Chicago suburb of Downers Grove, Ill.

8/26/14 1:00 pm EST

Free Webinar: Low Temperature Heat Emitter Options in Hydronic Systems

With proper design, you can create systems that require supply water temperatures no higher than 120° F under design load conditions.

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2014 October

Our October 2014 issue features a look at the 2014 Supply House of the Year: Ferguson Enterprises.

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NAECA 2015 Water Heater Regulations

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2015 National Plumbing & HVAC Estimator

Every plumbing and HVAC estimator can use the cost estimates in this practical manual!

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