How much does it cost to replace a corroded pool heater heat exchanger in Ottawa?

A pool heater heat exchanger replacement in Ottawa typically costs $800 to $2,500 for the part itself, plus $400 to $800 in labour, bringing the total to $1,200 to $3,300 depending on the heater size and brand. However, when a heat exchanger has corroded to the point of failure, you're often looking at a heater that's 8 to 12 years old, and replacement of the entire unit may be more cost-effective than major component repairs.

Heat exchanger corrosion is particularly common in Ottawa due to our aggressive freeze-thaw cycles and the chemical stress from frequent winterization and startup procedures. The heat exchanger is the heart of a gas pool heater — it's where the gas flame heats the copper or cupro-nickel coils that warm your pool water. When these coils corrode through, you'll see water leaking from the heater cabinet, poor heating performance, or complete heating failure. Corrosion typically starts from improper water chemistry (low pH is especially damaging), inadequate winterization that leaves water in the heat exchanger, or simply age-related deterioration from Ottawa's demanding climate conditions.

The challenge with heat exchanger replacement is that labour costs are substantial because the heater must be partially disassembled, and if one major component has failed, others are likely nearing end of life as well. A new gas pool heater installation runs $3,500 to $6,000 in Ottawa, while a heat pump replacement costs $4,000 to $8,000. Given that heat exchanger replacement often approaches $2,000 to $3,000 when you factor in associated repairs to gaskets, controls, and other aging components, many Ottawa pool owners choose full heater replacement for the additional $1,500 to $3,000 cost difference.

Critical consideration: All pool heater work requires a TSSA-licensed gas technician for natural gas units or an ESA-licensed electrician for electric components. Never attempt heater repairs yourself — gas appliances near water require professional expertise for safety and code compliance. Improper repairs can create carbon monoxide hazards or gas leaks.

When your heater shows signs of heat exchanger problems, you can connect with experienced pool equipment technicians through the Ottawa Construction Network directory to get proper diagnosis and repair quotes for your specific situation.