A heating pro is asked to retrofit a pellet-fired boiler to an existing distribution system consisting of older cast iron radiators, iron piping and an oil-fired boiler.

An installer is asked to add a monobloc-style air-to-water heat pump to an existing hydronic system that is supplied by a mod/con boiler.

A homeowner posted a question on The Wall at HeatingHelp.com about a drumroll sound that was coming from his brand-new steam boiler. What could it be? He included a video so all could hear, and sure enough, it sounded like a snare drum.

For many years, I’ve been offering a free demo version of the “Hydronics Design Studio” software that I co-developed with my long-time colleague, Mario Restive. It’s there for the taking at www.hydronicpros.com.

A technician encounters a system installed in the 1980s when radiant floor heating was relatively new in North America.

Here’s a countdown of the top 10 articles you read the most in 2021 based on the number of unique pageviews on www.pmmag.com. 

A homeowner hires a heating contractor to upgrade his propane-fired cast-iron boiler to a mod/con boiler. The cast-iron boiler is only 15 years old and in good shape. 

A young guy who was about the size of Bruno Mars came to my seminar once, and we were chatting during a break. I asked him how long he had been in the business. It’s good to see young people getting involved.

A multiple boiler system using sectional cast-iron boilers has been configured to supply two loads as shown below. A “crossover pipe” is installed in case the flow rate in the primary circuit is different from the flow through the boilers. There are several piping errors in this proposed design. Can you spot at least five of them?