Can you spot at least 5 causes for concern among these three photos? If so, what would you do to correct them?

Water-to-water heat pumps, supplied from geothermal earth loops, represent a growing sector of the hydronic heat source market. Most current-generation models can produce water temperatures up to about 125° F, perhaps a little higher if you’re willing to push the compressor operating envelope.

 All boilers that burn hydrocarbon fuels such as natural gas, propane, oil or wood produce water vapor as a byproduct of combustion.

The Circulator Savings Calculator communicates potential savings across the industry.

Grundfos announced the launch of the next generation of small circulators for the residential heating market with the introduction of the Grundfos Digital NEXT range — starting with the UPSe 15-58 in late 2022, followed by the release of the new, digital ALPHA 15-58 in early 2023.

If you’re anything like me, the first thing that comes to mind when you think about variable speed circulators is 1970s rock band Supertramp. No? Okay, maybe you’re not like me. Either way, allow me to elucidate.

Each year, Plumbing & Mechanical editors receive thousands of product releases from industry manufacturers. The 20 products highlighted here have earned the distinction of being PM’s Top Products of 2021 based on the number of page views on pmmag.com. Congratulations to those products on this year’s list.

On a military base in east-central Alaska — where the average winter temperature is 16° F with lows that fall well below minus 50° at times — dependable, low-maintenance winter heating systems are critical for the active-duty military families and Department of Defense civilians who live on the military post.

I recently reviewed a project in which a municipal building was being connected to a district heating system supplied by pellet-fueled boilers.

Sometimes multiple mistakes show up in small portions of hydronic systems.