Water heater: What capacity should you choose for your home?

When should you replace a water heater?

The lifespan of a water heater is generally 10 to 15 years, depending on the manufacturer. However, most home insurers require replacement after 10 years. Check the nameplate on the tank to find the manufacturing date.

What are the signs that a water heater is at the end of its life?

You should consider replacing your water heater if you notice:

• water that is less hot than before or runs out faster;
• slightly reddish-coloured water;
• rust at the bottom of the tank; and
• moisture or water droplets around the tank.

How to choose the right water heater capacity

The main criteria for choosing a water heater are the number of occupants and your usage habits (baths, showers, household appliances running simultaneously).
Allow approximately 10 to 15 gallons minimum per person, plus a small buffer. This simple rule helps you choose a water heater that is well suited to your household’s hot water needs.

Water heater: recommended capacity by number of occupants

Good to know: A water heater that is too small can quickly run out of hot water. An oversized model unnecessarily increases your energy consumption.

What are the important components of a water heater?

An electric water heater must meet the CSA C-191 standard, particularly through effective double-wall insulation.

Water inlet

A good-quality water heater will have a water inlet at the base of the tank. This allows for:

• better water circulation;
• optimized heating;
• reduced risk associated with certain bacteria, such as Legionella; and
• up to 10% more hot water compared to a standard model.

Heating elements

Some water heaters, such as Giant’s EcoPeak model developed with Hydro-Québec, use three heating elements instead of two. Comfort is comparable to a standard model, with no additional energy savings. In addition, hot water recovery time is longer after periods of high demand. That said, this model could use less electricity under Hydro-Québec’s time-of-use rates during winter peak events.

Tank quality

A high-quality interior lining, such as double vitreous enamel coating, improves corrosion resistance.

Sacrificial anode

This rod, attached to the top of the hot water tank and typically made of magnesium, protects the tank against corrosion. It dissolves slowly in soft water but more quickly in hard water. In the latter case, the standard anode should be replaced with an aluminum anode.

Manufacturer’s warranty

The manufacturer’s warranty is a good indicator of a water heater’s quality and durability.

• Entry-level: Approximately 6 years on the tank (leaks and parts)
• High-end: 10 years or more

Electric water heater energy efficiency: What you need to know

Two main criteria are used to evaluate a water heater’s performance and energy consumption.

1. Heat loss (Thermal standby loss)

A water heater naturally loses heat through its walls. These losses vary depending on:

• ambient air temperature;
• insulation quality; and
• tank size.

The larger the tank, the greater the heat loss.

2. First-hour rating

This rating indicates the amount of hot water available within one hour during a period of high demand. You can find it on most product specification sheets.

Performance examples by capacity

Renting vs. buying a water heater: Which should you choose?

Renting may be a good option if you plan to move or want to avoid unexpected costs.

Still undecided? Compare both options: renting and purchasing.

“All-inclusive” packages: Are they a good option?

Packages that include purchase, installation, and plumbing can simplify the process and protect you from unexpected costs.

• They are a good option if you want to avoid managing the work yourself.
• On the other hand, you may save money by purchasing your water heater separately, for example at a big-box store.

Installation and standards: What you need to know

Installing a water heater yourself is not within everyone’s reach. Technical knowledge is required, and electrical connections must be carried out by a certified electrician.

Drip pan

Installed beneath the water heater, a drip pan is not mandatory but is strongly recommended. It helps limit damage in the event of a leak, especially when combined with a water leak detector.

Thermostatic mixing valve

A thermostatic mixing valve is a device that blends hot and cold water to maintain a stable, safe output temperature. Some municipalities require it, but it is recommended in all cases.

How to save on hot water

A few simple steps can help reduce hot water consumption in your home:

• Insulate hot water pipes with pipe insulation.
• Install a low-flow showerhead.
• Add a faucet aerator to your taps.

Home insurance and your water heater: A key point

Insurers generally require water heater replacement after 10 to 12 years. Beyond that point, the risk of water damage increases and coverage may be denied. Improper installation can also result in a claim being refused.

Tip: follow installation standards and recommended lifespan guidelines. Choosing the right capacity and replacing your water heater at the right time helps you avoid unexpected issues and better protect your home.

Have questions or need guidance? CAA-Quebec’s Residential Advisory Services can help you make the right choices for your situation.