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Home » Topics » Columnists » Dan Holohan

Dan Holohan
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Dan Holohan covers a wide breadth of hydronic heating-related topics but specializes in steam heating.

ARTICLES

PME 0823 CLMN Dan Holohan slide 1
Heating Help | Dan Holohan

Things to consider when replacing a steam boiler

Dry steam is the goal
Holohan
Dan Holohan
August 10, 2023

I’m still seeing plenty of steam systems out there in our older cities, so knowing about dry steam will help you if you’re replacing a steam boiler. Dry steam is your goal.


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Electrification

Dan Holohan: Electrification may become more mainstream, but not overnight

Times change.
Holohan
Dan Holohan
June 9, 2023

Morris had me on the phone. It was 1974 and he was calling from Brooklyn, New York. I had a waxed handlebar mustache that year, and my workmates at the manufacturers’ rep were calling me Rollie Fingers because he was pitching for the Oakland Athletics in the World Series. Looking at those 1974 photos, I realize that the ‘stache was not one of my best ideas, but the 1970s were their own time and no one can change that.


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pipe sizes

Dan Holohan: Pipe Stories

The story behind nominal pipe sizes.
Holohan
Dan Holohan
April 10, 2023

I called the plumber because there’s an immediacy to plumbing; and I’m old enough to know that it’s best for me not to touch pipes. To each his own trade.


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180 degrees for hot-water systems

Dan Holohan: Why we use 180 degrees for hot-water systems

The history of The Carbon Club.
Holohan
Dan Holohan
February 10, 2023


Most hydronic systems have the boiler running up to 180° F with water returning from the system at 160°. This rarely happens in real life, but it’s the traditional way we do things.


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buildings that have tenants

Dan Holohan: Multifamily heating: Who pays?

Divvying up the bill
Holohan
Dan Holohan
December 9, 2022

There’s long been talk about how to divvy up the heating expenses in buildings that have tenants. Should each tenant have their own meter? Their own boiler? Boilers are a lot smaller than they used to be, right?


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new perspectives can make history

Dan Holohan: Seeing the word in a different way

Embracing new perspectives can make history.
Holohan
Dan Holohan
October 10, 2022

I was listening to James Trane the other day. He was speaking from Chicago in 1902, telling me that his system of steam heating using small pots of mercury was the best way to go.


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calculating

Dan Holohan: What I learned during the 1930s

Cheap matters.
Holohan
Dan Holohan
August 8, 2022

I was, I’m sure, not even in the minds of my someday-to-be parents, but I’ve spent a lot of time in that decade of the Great Depression nonetheless. I like to think of them as teenagers as they wondered what was to be. They truly were the Greatest Generation.


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The magic of the simple air vent
HEATING HELP

Dan Holohan: The magic of the simple air vent

You never know what knowledge you’ll discover by reading old literature.
Holohan
Dan Holohan
June 10, 2022

 recently came across the December 1924 issue of Popular Science magazine. Reading stuff like that always makes me feel like I have a time machine.


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Adventures in pumping
Heating Help

Dan Holohan: Adventures in pumping

The evolution of pumps, circulators and radiant heat.
Holohan
Dan Holohan
February 9, 2022

I read somewhere that the most prevalent machine in the world is the electric motor. I thought about that for a while and it made sense. Just look around. But then I began to wonder what the second-most prevalent machine in the world is. Turns out it’s the pump!


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Marbles and ghosts

Dan Holohan: Marbles and ghosts

Visual thinking is key to understanding hydronic systems.
Holohan
Dan Holohan
December 8, 2021

I worked for a manufacturers’ rep when I was first learning about hydronics. A guy I worked with was 15 years older than me. He knew that I had absolutely no training as an engineer so he took a different tack with my education.


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More Articles Tagged with 'Dan Holohan'
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April 27, 2023

13 Pitfalls of Heat Pump Water Heaters and How to Avoid Them

On Demand This webinar will discuss the available options in electric tankless water heaters, and how to avoid pitfalls when specifying the equipment.

July 20, 2023

How Modular Tankless Heat Pump Water Heaters Can Help Contractors Get 5 Stars From Their Customers

On Demand Installing and maintaining traditional tank-style heat pump water heaters is a challenge due to the added complexity these systems require. This webinar will discuss the ways in which contractors can harness the benefits of tankless heat pump water heaters to their advantage and ensure positive customer feedback.  

Earn: 1 PDH; 0.1 ASPE CEU; 1 AIA LU/HSW; 0.1 IACET CEU

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