Articles by John Siegenthaler, P.E.

Heat pumps are renewable energy heat sources

By John Siegenthaler, P.E.
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I recently read an Internet posting asserting that heat pumps, both air-source and geothermal, should not be considered renewable energy heat sources.


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Do this, do that

By John Siegenthaler, P.E.
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A new piping concept and control wiring challenge.  
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Avoiding thermal depression

By John Siegenthaler, P.E.
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A new way to protect a heating system.
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Larger than necessary

By John Siegenthaler, P.E.
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You’re probably oversizing expansion tanks in low-temperature systems.
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Hydraulic separation revisited

By John Siegenthaler, P.E.
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It doesn’t have to be perfect to be effective.
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Stating the obvious

By John Siegenthaler, P.E.
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Some recent discoveries about ducting.
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Those other heat pumps, Part 1

By John Siegenthaler, P.E.
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Air-to-water heat pumps offer new opportunities for hydronic pros.
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Sidearm revamp

By John Siegenthaler, P.E.
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Updating an old approach using modern hardware.
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Beware of bottlenecks, Part 2

By John Siegenthaler, P.E.
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Sometimes the Btu just canít squeeze through.
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Beware of bottlenecks, Part 1

By John Siegenthaler, P.E.
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Too little flow causes too many complaints.
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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!

9/16/14 9:00 am PDT

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HOLDRITE will be hosting a free webinar for Acoustical Isolation on Tuesday, Sept. 16, 2014.

Plumbing and Mechanical

2014 August

2014 August

In the August issue of PM, read about the continued construction and renovations being made to hotels and restaurants. Find out the focus of this year's ISH China show will be, who made this month's Truck of the Month and read what Elkay has to say about their commercial construction expansion. Also, read the latest news and discover the newest products being used by professionals in the plumbing and mechanical industry.
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2014 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

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