Tankless, also known as demand or instantaneous, water heaters provide hot water only as it is needed. That means tankless heaters do not produce the standby energy losses associated with storage water heaters, saves you money. For homes that use 41 gallons or less of hot water daily, demand water heaters can be 24%-34% more energy efficient than conventional storage tank water heaters. For larger use of hot water, approximately 86 gallons per day, they can be 8%-14% more energy efficient. In addition, by installing a tankless hot water heater at each hot water outlet, you can save 27%-50% of energy.

So how does a tankless stack-up to a tank water heater?


  • Size: Big and bulky
  • Electricity: 24/7 stand by electricity use
  • Water: Supply limited to the size of the unit
  • Altitude: Many up to 10,000 ft with chip
  • Energy: Most gas units are Energy Star Approved, while most electric are not



  • Size: Sleek, like a suitcase
  • Electricity: As needed use, up to 40% savings over tank
  • Water: Unlimited hot water supply
  • Altitude: Many up to 9,600 ft with chip
  • Energy: Most Energy and Star Approved


Before purchasing a tankless water heater, you should consider the following:

1)      Fuel Type-select between an electronic tankless water heater or a gas-fired tankless water heater. If you plan on installing an electric tankless water heater, you should consider:

  •  Voltage: 110V, 120V, 208V, 220V, 240V and 277V
  • Amperage: Different electric water heaters will have various requirements in amp draw. Make sure you will be able to support electrical demands of an electric tankless water heater.
  • Circuit Breaker: Depending on the tankless water heater, it may be necessary to put your electric tankless water heater on its own circuit or circuits.


2)      When deciding which tankless water heater to purchase, you will also need to consider where you will need hot water. Are you looking for a unit that will heat the water in one bathroom sink, also known as single point application, an entire bathroom (multi point application), or an entire house, apartment or condo (whole house application)? It will be important to identify the number of fixtures that will require hot water because they will each have their own demands.

The flow rate is especially important since tankless water heaters will generate a temperature rise based on the flow rate demanded. It is also suggested to analyze the surrounding incoming water temperature. If you live in a cold climate, your incoming water temperature will likely be much lower than if you live in a warm climate. You should find out how much temperature rise you will need in order for your hot water to reach the desired heat.

3)      Application: below are a few examples of different models and their functionality for a specific application:

  • Electric Point of Use tankless water heater
  • Use tankless water heaters
  • Thermostatic
  • Whole house indoor use and outdoor use


Once you have made the decision to install a tankless water heater. it is best to contact a qualified, licensed plumbing and heating professional. Proper installation will optimize a tankless water heater’s energy and efficiency. In addition, it will depend on many factors that include climate and local building code requirements.

Most tankless water heaters have a life expectancy of more than 20+ years in comparison to tank or storage water heaters than last only 10 to 15 years. In addition, periodic water heater maintenance performed by a licensed plumber will significantly extend your water heater’s life and minimize loss of efficiency.  Browse our preferred line of tankless water heater systems and speak with a plumbing professional to find out which product is best for you.