The lifespan of a tankless water heater is 20 to 30 years. This is more than double the lifespan of a conventional hot water tank. In Alberta, a standard hot water tank will last approximately 7 to 10+ years, with hard water conditions and no maintenance. So, although it will cost you two to three times as much to purchase and professionally install a tankless water heater compared to a conventional water heater, it can last you more than twice as long. In addition, a tankless water heater will never run out of hot water, unlike a traditional tank, unless its capacity isn’t large enough for the demand you place on it.
