Dan Holohan

Dan Holohan

Dan Holohan operates HeatingHelp.com. You can reach him at dan@heatinghelp.com. He loves hearing from you!


Daniel Chapman Stillson: Inventor of the pipe tong

Not far from where our daughter Colleen and her husband, Adam, used to live in Somerville, Mass., there’s a house for sale.
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Calculating heating measurements old school

Cardboard apps.
Calculating measurements since 1867 — no battery or signal required.
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Hot water and steam boilers during the summer

Summer, hot water and steam

The effects of fresh water and near-boiling water on iron pipe.

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A grand punch in the mouth

Lessons learned from the Great Recession and Hurricane Sandy.

 I’d like to begin with a big shout-out to that noted philosopher, Mr. Michael Tyson, who once said, “Everyone has a plan, ’til they get punched in the mouth.”

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Thank Denis

A brief history of the steam pressure-relief valve.
A brief history of the steam pressure-relief valve.
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We Put the Fish in Efficiency

What exactly is higher efficiency higher than?
My friend, Jenni, was visiting from Scotland and had never been to Central Park, so I took her there for a long walk, a ride on the carousel and some wine at the boathouse. We sat outside.
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Hydronic heating has come a long way, but system innovation continues

Twenty years ago this month, I wrote a column for this fine magazine titled, “Reaching for Higher Plateaus.”

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Vertical heating

Unraveling the mysteries of early 20th century high-rise steam-heating systems.
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The house by Cedar Hill

The early days of district steam heating systems in NYC.
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Old boiler room stuff

Use this list to troubleshoot old steam-heating systems.

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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.