Photograph of severe rust damage on a steel heating boilerHow to Diagnose & Fix Leaks at Heating Boilers

  • BOILER LEAKS CORROSION STAINS - CONTENTS: How to diagnose, inspect, evaluate, repair heating boiler leaks. How to inspect & repair central hot water heating boilers - hydronic heating. Baseboard, radiator, convector heat inspection, defects, repairs
  • POST a QUESTION or READ FAQs about diagnosing and fixing leaks on hot water heating systems & heating boilers
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Heating boiler leak repairs: here we explain how to detect, diagnose, find, & evaluate leaks in or on hydronic heating boilers with focus on residential heating boilers, including leaks leading to loss of heat, heating boiler noises, leaks, odors, or smoke, and high heating costs.

This article series answers most questions about central hot water heating system troubleshooting, inspection, diagnosis, and repairs. We describe how to inspect, troubleshoot and repair heating and air conditioning systems to inform home owners, buyers, and home inspectors of common heating system defects.

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How to Evaluate Heating Boiler Leaks & Corrosion

Tankless coil leak (C) Daniel Friedman

Our photograph at page top shows severe rust at the tankless coil on a steel heating boiler - this boiler may be beyond repair even though the rest of the unit looks pretty good. When a tankless coil-mounting surface on the boiler itself is severely rusted it may be impossible to get an adequate seal when bolting on a new hot water coil, making it necessary to replace the entire heating boiler.
See TANKLESS COILS for more about this device.

[Click to enlarge any image]

It is important to recognize and accurately report the significance of rust like this on any heating boiler. We continue to add to and update this text as new details are provided. Contact us to suggest text changes and additions and, if you wish, to receive online listing and credit for that contribution.

Even significant boiler water leaks at a tankless coil (left and at page top) may never show up on the building floor as a wet spot, leading an owner to ignore a condition that can lead to very expensive damage. When observing evidence of leaks on a heating boiler, keep these points in mind:

Boiler section leak (C) Daniel Friedman

A Catalog of Common Heating System Leak Points - Where to Watch for Heating System Leaks

Leaky circulator pump (C) Daniel FriedmanNote: the following catalog of common places where you may find leaks on a hot water heating system boiler or its components is arranged alphabetically. Some of these leaks, such as at TPR valves, are dangerous and require urgent attention or even system shut-down.


Continue reading at BOILER LEAKS, HOW TO LOCATE or select a topic from closely-related articles below, or see our complete INDEX to RELATED ARTICLES below.

Or see CHEMICAL TREATMENTS, BOILER for a discussion of leak-stop products.

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