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Figure 1 shows the piping layout for an actual installation. It uses two boilers, fired in stages, to supply three areas of a building. One of those areas is sub-divided into three zones. The other two areas are handled by individual zone circulators. The "primary circulator" operates whenever any load circuit is on. All circulators are fixed speed. There's a partially closed ball valve at the end of the "primary loop."

Data centers are moving faster than ever, and prefabrication is helping them keep up.

We become comfortable with what we perceive to be best practices and believe they are also safe for all involved. Cupric oxide will always be a concern when brazing copper refrigerant line sets, so purging with nitrogen is the best way to keep your refrigerant lines clean and pristine during brazing.

Modern hydronic systems benefit from wider temperature drops, energy scavenging, and careful integration with domestic hot water.

The event will include several segments of technical training presented by John Siegenthaler, P.E.

Proposed adjustments could ease reporting requirements while maintaining oversight of high-risk substances.

To start off the new year, editor Kristen Bayles reflects on 2025, and what's to come in 2026.

With a few intentional steps, you can make sure the work you do in your community not only wins hearts, but also helps you win searches.

In this episode of And So It Flows, Jennifer Harrison and Kaytee Gray from SupplyHouse.com discuss how digital merchandising and fulfillment are evolving to empower contractors with expert product information, simplifying decision-making in the field.

For contractors, taking high-quality photos at jobsites can be highly beneficial.