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Home » Authors » John Siegenthaler, PE

Articles by John Siegenthaler, PE

Figure 1: A direct expansion to water module (the white box) bridges the gap between air-source heat pumps and hydronics technology.

The Big Guy Doesn’t Always Win

A Unique Air-to-water Heat Pump System Rivals Geothermal System Efficiency
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John Siegenthaler, PE
April 27, 2015
No Comments

While it’s true geothermal heat pumps do offer excellent opportunities in combination with low-temperature hydronic distribution systems, they are not the only viable way to combine the heat-leveraging ability of heat pumps with the unsurpassed comfort offered by modern hydronic distribution systems.


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A state-of-the-art, pellet-fueled boiler with pellet hopper at side.

Don’t Overlook the Trees

Modern Approaches to Wood-fired Hydronic Heating
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John Siegenthaler, PE
February 16, 2015
No Comments

Long before Americans had access to natural gas, propane, fuel oil, or electricity, and long before there were automatically controlled central heating systems, wood was the most commonly used heating fuel.


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Figure 1.

German Water: How Flow Rate Affects Heat Output

It’s OK to Design a System Outside of a 20°F Delta T
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John Siegenthaler, PE
December 1, 2014
No Comments

My objective is not to dissuade you from designing around 20° delta T at design load. It’s to assure you the sun will come up tomorrow if you happen to pick a different value.


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John Siegenthaler

Hydronic Radiant Ceiling Cooling for Smaller Buildings

Though More Expensive, Radiant Trumps Forced Air in Comfort
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John Siegenthaler, PE
September 22, 2014
One Comment

The combined cost of hydronic radiant panel heating, along with a separate central cooling system, often strains the construction budget to a point where something has to go, and that something is usually the radiant heating option. It gets trumped by a lower-cost forced-air system that delivers both heating and cooling, albeit often at reduced comfort.


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Figure 1.

Expansion Tank Pressurization

Improper Air-side Pressurization ‘Wastes’ some of the Internal Volume
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John Siegenthaler, PE
July 28, 2014
No Comments

Having the proper air-side pre-pressurization prevents system water from entering the expansion tank, until the water begins expanding due to heating. 


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John Siegenthaler

My First Online Teaching Experience

I Often Find Myself Talking to My Computer
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John Siegenthaler, PE
May 26, 2014
No Comments

Last fall, I taught my first online course dealing with designing hydronic heating systems. The course was titled “Mastering Hydronic System Design.” It was a collaborative effort between HeatSpring Learning Institute, BNP Media’s CE Campus, and myself.


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Figure 1.

Contrasting Rules of Thumb, Calculations

Using Accurate Numbers is the Professional Thing to Do
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John Siegenthaler, PE
March 17, 2014
No Comments

If you’re using a calculator, spreadsheet, or other computational tool, you should use the most accurate numbers possible. It’s just part of being a professional.


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Figure 1. The heat output versus flow relationship for a 12-foot-long piece of typical residential fin-tube baseboard being supplied with 160°F water.

Heat Transfer: Nature Versus Math

Formulas and Assumptions Don’t Always Predict what Happens
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John Siegenthaler, PE
January 27, 2014
No Comments

The following formula has been around the North American hydronics industry for a long time: Btuh = 500 x gpm x delta T. It can be used to estimate the rate of heat transfer into or out of a device that has a stream of water flowing through it at a known flow rate, and with a measured temperature change between the inlet and outlet of that water stream.


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Missing: Self Buffering & Low Head Loss

Missing: Self Buffering & Low Head Loss

Considering Circulators and Head Loss in Modern Boiler Systems
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John Siegenthaler, PE
November 18, 2013
No Comments

In newer modulating/condensing boilers, many of their heat exchangers had to sacrifice two very desirable qualities in the interest of being small and light.


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Avoiding Thermal Depression

Avoiding Thermal Depression

A New Way to Protect a Heating System
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John Siegenthaler, PE
September 9, 2013
No Comments

A cool concrete slab is like a black hole for Btus. It gobbles up any heat that dares to get close. The solution is to install a mixing assembly operated by a controller that measures the boiler’s inlet temperature, as well as the water temperature supplied to the distribution system.


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