2026 May

Plumbing and Mechanical

In the May 2026 issue of Plumbing & Mechanical we examine when and why leaks happen. We look at how installers can respond to Legionella. With an increase in retrofits in the current market, we look at how contractors are navigating the issues that come with it. We ask if smart water systems really pay off. Also, the monthly columns, new products, and more.

Check back throughout the month for additional content.

Leaks Happen. Here’s the ‘Why’ When They Do

From installation to maintenance, here's where and why piping systems are most vulnerable to failure.

Gabe Ellis

May 4, 2026

Let’s take a closer look at the most common causes of leaks — especially in plastic piping systems — during installation, service and maintenance.

The Glitch & The Fix: May 2026

The Glitch and the Fix: Grounded Errors

Can you find the issue with this multi-zone floor heating system?

John Siegenthaler, P.E.

May 5, 2026

An installer is planning a multi-zone floor heating system supplied from a single stage non-modulating geothermal heat pump. Can you identify at least four design flaws or operational issues that are likely to develop if the system is installed as shown?

How Installers Can Respond to Increasing Legionella Risk

It is more important than ever for installers to stay informed about the latest solutions that can help public buildings optimize infection control.

Greg Rankin

May 13, 2026

Installers can decrease the risk of Legionella by staying informed.

Eastern Washington Hospital Mechanical System

Old Systems, New Demands: How Contractors are Navigating the Retrofit Market

Integrating high-efficiency equipment with existing piping and controls remains a key challenge (and opportunity) in today’s retrofit market

Kristen R. Bayles

May 15, 2026

With an increase in retrofits in the current market, here’s how contractors are navigating the issues that come with it.

Hydronics Workshop | John Siegenthaler

Diagnosing Pressure and Air Issues in Closed-Loop Systems

Simple checks, big insights

John Siegenthaler, P.E.

May 18, 2026

Think about the “long game” when designing or installing hydronic systems. Make the system’s as easy as possible to service. Those who follow will appreciate and respect you for doing so.

Guard on Compliance | Misty Guard

The Impact of EU Reach on Plumbing Component Materials

A look at the pending European regulations on per- and polyfluoroalkyl substances in light of the European Committee for Socio-economic Analysis draft opinion.