Author: Dan Holohan

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Dan Holohan

Understanding Primary/Secondary Pumping

Primary/secondary pumping has become pretty popular nowadays, especially with boiler manufacturers. They love it because it offers a simple way to protect their boilers against low-temperature return water and the resulting flue-gas condensation that low-temperature water causes

Why Compression Tanks Waterlog

When hot water heating was new (and this goes back to the turn of the century) the Dead Men installed gravity systems because Homer Thrush had not yet invented the circulator

How Steam Traps Can Bite You

In the beginning there was one-pipe steam, and one-pipe steam was pretty simple. The steamtraveled up the pipe; the condensate fell down the pipe. Size and pitch the pipes properly, don’t over-fire the boiler, keep the wet returns clean, and you were in pretty good shape

Radiant Heat And Wood Floors

More and more radiant systems going into existing homes as retrofit projects. On many of these jobs the tubing winds up getting attached to the underside of the wood floor. On other jobs, the tubing goes down on top of a subfloor, beneath the finish wood

Why A Radiator Is Not Heat

I once looked at a problem job in an office building on Long Island. It can get pretty windy here on the Isle of Long. This building had a wide driveway that passed under the first floor to a parking lot out in the back

The Golden Rules of Hydronic Heating

Ever notice how most of us head for the boiler room first? I figure this is a vestige left over the days when we all lived in caves. You feel safe when you can get underground and build a fire, right?

Radiator Stories You May Not Have Heard

The guy was wearing clean Docker slacks, a wrinkle-free, red golf shirt and boat shoes. He didn’t fit in with the plumbers and heating contractors who were waiting their turn to be helped

The Trick To Sizing Steam Piping

They built the place in the 1930s and heated it with steam. It’s always been a commercial building – part office, part factory. They heat the offices with one-pipe steam radiators and the factory with steam unit heaters nowadays, but it wasn’t always that way

What color is your radiator?

First, those in which the pigment consists of small flakes of metal, such as the aluminium and bronze paints, most commonly used for painting radiators, which produce a metallic appearance and will be called metallic paints

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