Tank vs Tankless – Pros and Cons

Looking at getting a tankless water heater?  We can do that!  Call today for your free estimate.

Looking for more information?  Get it with our free in-home estimate service, or read about it below.  Here’s what to expect.


  • Most energy efficient type of domestic hot water heating on the market.  Only heating the water as you need it means no waste.
  • Has the highest rebate amount from FortisBC
  • They take up less space and usually hang on the wall.
  • No risk of holding tank failure and therefore major flood risk is avoided – Some insurance companies are requiring homeowners without dedicated drains to go to a tankless model.
  • Can be used in a single application, such as a kitchen or addition, or a whole house
  • No concerns as to timing of water use after other household hot water demands
  • Life expectancy from manufacturers is 20 years, more than three times that of a tank.
  • Cost recovery is possible with significant energy savings – although it does take a long time
  • If you like super hot water, turning up the temperature doesn’t have as high fuel use increase as a tank

Anyone who has ever been the second person to rush through the shower will probably tell you that having hot water when you were used to having none will erase every possible con there is!  Better to make an informed choice though, so please read some of the most common concerns below.


  • More expensive to purchase, service and repair
  • Susceptible to reduced flow rates if incoming water is really cold.
  • Anticipation of your needs and sizing is really important so you will be satisfied with the purchase.
  • If demand is excessive (such as multiple draws at once ie. Shower, clothes washer, and dish washer) the water will still be hot, but there will be less water pressure.
  • Can take longer for hot water to arrive and thus use slightly more water in the process.  If you are on a water metering system this may be a concern for you.
  • Minimum flow rates.  If the flow rate for hot water falls below .5 gpm the unit will not sense a draw and will not heat the water.
  • Frequent on/ off uses of between 1-3 seconds result in a hot / cold/ hot / cold flow from the tap. As you have to wait for the system to recognize the demand every time the hot water is used.
  • It has been reported that some mixing valves (on taps and showers to prevent scalding) are not compatible with this type of system and will need to be replaced.
  • Power is required and installation may require an electrician
  • Because there is no water storage, if the power fails you have no hot water.

R&B takes care to choose proven brands and only install with the highest quality of workmanship.  So whatever you choose, you can be assured of a satisfactory result.  Call today for your free estimate.