Should I install a tankless or tank water heater for a bathroom renovation in a Vancouver home?

For most Metro Vancouver single-bathroom renovations, replacing your existing tank water heater is rarely necessary — but if your current unit is aging or you're upgrading from a single to a multi-bathroom home, a tankless (on-demand) water heater offers significant long-term advantages in Vancouver's mild climate and high-energy-cost market. The decision between tank and tankless depends on your household size, hot water demand, existing infrastructure, and budget.

Tank water heaters store and continuously heat 40 to 75 gallons of water, ready for immediate use. They're the standard in most Metro Vancouver homes built before 2010. A new conventional gas tank water heater (50 gallons, suitable for a 2-3 bathroom home) costs $1,200 to $2,500 installed including removal of the old unit. Electric tank heaters are less common in Metro Vancouver due to higher operating costs but cost $800 to $1,800 installed. Tank heaters are simpler to install, have lower upfront costs, and deliver hot water to multiple fixtures simultaneously without the flow-rate limitations of some tankless units. Their main drawback is standby energy loss — they continuously heat water even when nobody is using it, which wastes energy 24 hours a day.

Tankless (on-demand) water heaters heat water only when a tap is opened, eliminating standby energy loss entirely. A quality gas tankless unit for a whole-home application costs $3,000 to $5,500 installed — significantly more upfront than a tank heater. However, tankless heaters reduce energy consumption by 15-30% compared to tank units, which translates to meaningful savings on your BC Hydro or FortisBC bill over the unit's 20-year lifespan (compared to 10-12 years for a tank heater). Over that lifespan, the energy savings and reduced replacement frequency typically offset the higher initial cost.

Metro Vancouver climate advantages for tankless. Vancouver's mild winters are actually a significant advantage for tankless water heaters. Incoming cold water temperature in Metro Vancouver rarely drops below 5 to 8 degrees Celsius, compared to 2 to 4 degrees in Ontario or the Prairies. This means a tankless unit doesn't have to work as hard to raise water temperature to the 49-degree Celsius output recommended by the BC Building Code for residential hot water (high enough for comfort, low enough to prevent scalding when paired with a thermostatic mixing valve). A tankless unit rated for Vancouver's incoming water temperature can serve more fixtures simultaneously than the same unit installed in a colder climate.

Sizing considerations. A single bathroom needs roughly 2 to 3 gallons per minute (GPM) of hot water flow for a shower. A kitchen sink adds another 1.5 GPM. If you're running a shower and a dishwasher simultaneously, you need a tankless unit rated for at least 4.5 GPM at a 35-degree temperature rise. Most whole-home gas tankless units are rated at 7 to 10 GPM, which is adequate for 2-3 simultaneous uses in a Metro Vancouver home. Point-of-use electric tankless units (smaller, installed near a single fixture) cost $300 to $800 installed and are an option for adding hot water to a new bathroom that's far from the main water heater, avoiding long pipe runs and wait times.

Installation considerations. Switching from tank to tankless isn't always straightforward. Gas tankless units require a dedicated gas line (often larger diameter than the existing water heater connection), a specific venting configuration (Category III stainless steel vent or direct-vent through an exterior wall), and adequate combustion air supply. These installation requirements add $500 to $2,000 to the project beyond the unit cost. All gas work must be performed by a licensed gas fitter with Technical Safety BC (TSBC) certification, and requires a gas permit and inspection. Electric tankless whole-home units require a 150 to 200 amp electrical service panel, which many older Vancouver homes don't have without a panel upgrade ($2,000 to $4,000).

Practical recommendation: if your tank water heater is less than 8 years old and adequately serves your household, don't replace it as part of a bathroom renovation — put that budget toward waterproofing, tile, and fixtures instead. If your tank heater is nearing end of life (10+ years) or you're adding a bathroom to the home, a gas tankless unit is the better long-term investment for Metro Vancouver homeowners, with lower operating costs and a longer lifespan that justify the higher upfront cost.