Articles by John Siegenthaler, P.E.

Stating the obvious

Some recent discoveries about ducting.
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Those other heat pumps, Part 1

Air-to-water heat pumps offer new opportunities for hydronic pros.
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Sidearm revamp

Updating an old approach using modern hardware.
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Beware of bottlenecks, Part 2

Sometimes the Btu just canít squeeze through.
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Beware of bottlenecks, Part 1

Too little flow causes too many complaints.
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Retrofits made easy

What’s often impossible with forced air becomes straightforward with hydronics.
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They're not boilers

Designing hydronic systems around outdoor wood-fired furnaces.
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Baseboard makeover

A modern approach to a traditional means of hydronic heating.
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Coil envy

Why don’t North American indirect tanks have larger heat exchangers?
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Transitions, Part 2

How to extract more heat from a storage tank.
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2014 Truck of the Month

PM has featured so many great plumbing service trucks! See plenty of them here in our Truck Of The Month Archives page. Are you proud of your truck? Go to our Truck of the Month page to find out how your service truck could be chosen!

1/27/15 2:00 pm EST

Grow Your Business and Improve Operations with New Payment Technology

Attend this free webinar to learn how new developments in payment technology can help you close more jobs, increase upselling opportunities and improve operations.

Plumbing and Mechanical


2015 January

The January issue of PM features cover story: 2015 Plumbing Contractor of the Year: Jim Steinle and Atomic Plumbing.

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Where do you look for new employees?

Where do you look for new employees?
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The Plumbing and Mechanical Store

2015 National Plumbing & HVAC Estimator

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

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Truck of the Month

Truck of the month

Are you proud of how your service truck looks? Do the graphics give people whiplash as they drive by? Have your calls increased because people remember your truck — and your company name? If so, we’d like to see it, too! Click here to find out how your service truck could be chosen as PM's Truck of the Month.