How Do Tankless Water Heaters Work? On Demand Water Heating | Electric Tankless Water Heaters | Instant Hot Water
EcoSmart tankless water heaters deliver hot water by heating the water as it passes through the unit.
Once a fixture is turned on, water enters the EcoSmart heater through the inlet pipe. The flow sensor near the inlet detects the gallons per minute flow rate and the inlet thermostat reads the temperature of the incoming water. The control board calculates the appropriate power output to reach the set temperature based on the inlet temperature and flow rate. Triacs send the necessary voltage to the heating elements to achieve the correct power output. The heating elements activate and heat the outgoing water to the user-set temperature.
One of the many advantages of an EcoSmart tankless water heater is the ability to install the heaters closer to the point of use. This reduces the amount of travel time within the pipes and provides hot water more quickly to the fixture. EcoSmart units only heat water when it is required, so there is no wasted energy keeping stored water hot 24/7.
It is important to have a basic understanding of how the water is heated to best select a unit There are 3 pieces of information that are necessary to choose a unit: Gallons per minute of application, inlet temperature of water, and desired outlet temperature. For assistance in choosing a heater, see applications below.
- kW Required – to find which size of unit you need, figure out the gpm of the application and the desired temperature rise.
- kW Req. = GPM x temp. rise/6.83
- Example: For a 2.0 gpm shower and a 0.5 gpm sink running simultaneously with an inlet water temperature of 40°F and a desired outlet temperature of 105°F, an ECO 24 is recommended.
- Example Calculation: 2.5 x (105-40)/6.83 = 24 kW
- Temperature Rise – the temperature rise that a specified unit is able to deliver for an application
- Temp. Rise = kW x 6.83/GPM
- Example: An ECO 18 (18 kW) heating a 1.5 gpm application will deliver a maximum temperature rise of 82°F. In a region with an inlet water temperature of 40°F, the max. outlet temperature would be 122°F. The ECO 18 is a good fit for any set temperature 122°F or under. For a higher outlet temperature, consider a unit with a higher kW.
- Example Calculation: 18 x 6.83/2.0 = 82°F temp. rise
- Gallons per minute capacity – how many gpm a unit can deliver with a known inlet temperature and set output temperature
- GPM = kW x 6.83/temp. rise
- Example: In a region with an inlet temperature of 60°F in an application using an ECO 11 (13kW) with a set temperature of 105°F, the ECO 11 will deliver a maximum of 2.2 gpm flow rate.
- Example Calculation: 13 x 6.83/(105-60) = 2.2 gpm
For simple calculation, kW reference is based on a 100% heater efficiency. EcoSmart tankless heaters are 99% energy efficient. Inlet temperatures may vary by season.
For more assistance in selecting the best unit, or for more information, please contact EcoSmart.
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|The ECO 18 is a mid-range EcoSmart tankless water heater and it can be used as a point-of-use or whole house water heater, depending on demand and inlet temperature. Learn more »|