A tankless water heater has no storage. When you open a hot tap, a flow sensor fires a burner that heats water as it passes through a heat exchanger, and it stops when you close the tap. There is no tank of water being kept hot around the clock, which removes standby loss, and no fixed reservoir to run out, which is where the endless hot water claim comes from.
What do you actually gain?
The two real advantages are standby efficiency and space. You stop paying to keep forty gallons hot overnight, and you get a wall-mounted unit back instead of a floor-standing tank.
Lifespan is the quieter advantage. A well-maintained tankless unit often outlasts two tanks, and most parts are serviceable rather than requiring whole-unit replacement.
What are the trade-offs?
Flow rate replaces tank size as the limit. A tankless unit can run indefinitely but only at a certain litres-per-minute at a given temperature rise, so simultaneous showers and a dishwasher can outrun a unit sized too small.
- Higher upfront cost, both equipment and install
- Usually needs a larger gas line and new venting
- Descaling matters more in hard water areas
- Brief delay before hot water arrives at the tap
Why does our water matter here?
Scale is the main enemy of a tankless heat exchanger. Where water is harder, annual descaling is not optional maintenance, it is what keeps the efficiency and the warranty intact.
We install and maintain both tank and tankless systems across the Fraser Valley, and we will tell you when a straightforward tank replacement is the better value for your household.
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We size on your real hot water demand, not on a brochure flow rate.