Technical directory · Combustion
Heat exchanger surfaces
The heat exchanger separates combustion products from circulating household air; its condition is a safety assessment.
What to observe
Request the specific inspection method, accessible findings and a written explanation of any alleged crack or defect.
A field example
A contractor alleging a crack should describe where it is, how it was observed and why the equipment is unsafe. A homeowner should not accept a cleaning product as a remedy for a confirmed breach.
What the written work should say
A registered gas contractor should evaluate unsafe equipment and explain whether repair, replacement or shutdown is required.
Where this task stops
No cleaning claim can certify a cracked heat exchanger as safe.