Repair or Replace a Water Heater? A Canadian Decision Guide

Diagnose the symptom, not the age

A tank that has rusted through cannot be repaired, and no amount of sealant changes that. But plenty of failures that present as "the water heater is dead" are a thermocouple, an element, a thermostat, or a gas valve—parts that cost a fraction of a replacement and are routinely swapped.

The location of a leak is the single most informative detail. Water at a fitting, the drain valve, or the temperature and pressure relief discharge pipe is a different problem from water seeping from the seam of the tank itself. Look before you mop, and photograph it.

Safety and water damage

The temperature and pressure relief valve is a safety device. It must discharge safely to an approved location and must never be capped, plugged, or blocked—if it is weeping, that is a symptom to diagnose, not a nuisance to silence.

A tank holds a lot of water, and where it sits determines how bad a failure gets. Above living space, over finished flooring, or in a condo, a drain pan plumbed to a drain is worth the modest cost. Know where the cold-water shutoff is and confirm it actually turns before you need it in a hurry.

On gas units, the FortisBC odour procedure applies as it does to any gas appliance: leave the building before calling, and keep a working carbon monoxide alarm nearby. Temperature settings involve a genuine tradeoff between scald risk and bacterial growth at low storage temperatures—follow the manufacturer’s instructions and applicable code rather than guessing, and ask about a mixing valve if you need both.

Permits and who may do the work

Vancouver lists replacing an existing electric powered hot water tank among projects that do not require a City permit. That is a statement about the City building permit only—Technical Safety BC still regulates the electrical and gas work involved, and its rules apply regardless of what the City requires.

For gas water heaters, a licensed gas contractor normally pulls the permit as part of the job. Homeowner permits are not available to strata owners, owners of non-strata duplexes, or anyone running a business from home. Strata buildings frequently add their own requirements—approved contractors, specific insurance, notice periods, and shutoff scheduling—so check with your property manager before booking.

• Type: gas, electric, tankless, or heat pump
• Age from the rating plate or serial number
• Capacity in litres or gallons
• Exactly where the water appears
• Whether the unit sits above living space
• Recent changes in household hot water demand

Choosing a replacement

Natural Resources Canada publishes a Water Heater Guide through its Office of Energy Efficiency covering the main types and how efficiency ratings work. It is the right starting point for understanding the tradeoffs before a salesperson frames them for you.

Compare complete installed costs, not unit prices. A tankless or high-efficiency unit may need different venting, a larger gas supply, or electrical work. A heat pump water heater needs adequate space, air volume, and drainage, and it makes noise where it sits. Add permits, disposal of the old unit, and any plumbing or electrical alterations to every quote so you are comparing the same thing.

Check rebates before deciding. The CleanBC Better Homes rebate search shows what your community, home type, and ownership status may qualify for, and on a heat pump water heater the difference can be large enough to change which option is cheapest overall.