Tankless Water Heaters, also called Instantaneous or Demand Water Heaters, provide hot water only as it is needed. Traditional storage water heaters produce standby energy losses that cost you money. We do not leave our homes heated while vacationing. We only heat our homes when there is a demand for heat. In the same way, a Tankless Water Heater is used only when there is a demand for hot water. Back To Top
Tankless Water Heaters heat water directly without the use of a storage tank. Therefore, they avoid the standby heat losses associated with storage water heaters. When a hot water tap is turned on, cold water travels through a pipe into the unit. In an electric Tankless Water Heater an electric element heats the water. In a gas-fired Tankless Water Heater a gas burner heats the water. As a result, Tankless Water Heaters deliver a constant supply of hot water. You don't need to wait for a storage tank to fill up with enough hot water. Typically, Tankless Water Heaters provide hot water at a rate of 2 – 5 gallons (7.6 – 15.2 liters) per minute. Typically, gas-fired Tankless Water Heaters will produce higher flow rates than electric Tankless Water Heaters.
See Our Gas Tankless Water Heater to Electric Tankless Water Heater Comparison Sheet
Some smaller Tankless Water Heaters, however, cannot supply enough hot water for simultaneous, multiple uses in large households. For example, taking a shower and running the dishwasher at the same time can stretch a Tankless Water Heater to its limit. To overcome this problem, you can install a “whole house” type Tankless Water Heater or install two or more Tankless Water Heaters, connected in parallel for simultaneous demands of hot water. You can also install separate Tankless Water Heaters for appliances—such as a clothes washer or dishwater—that use a lot of hot water in your home.
For homes that use 41 gallons or less of hot water daily, Tankless Water Heaters can be 24% – 34% more energy efficient than conventional storage tank water heaters. They can be 8% – 14% more energy efficient for homes that use a lot of hot water, around 86 gallons per day. You can achieve an even greater energy savings of 27% – 50% if you install a Tankless Water Heater at each hot water outlet. Back To Top
The energy savings with a tankless water heater can be significant. With conventional water heaters, up to 20 percent of the energy used is wasted because of “standby” heat loss from the tank and hot water pipes.
Tankless water heaters eliminate such losses, resulting in an energy factor of 0.84, compared to 0.64 for the most energy-efficient tank-style water heater.
That means replacing a natural gas tank water heater with a tankless model will cut operating costs by 25 to 45 percent. The savings are even more dramatic if you replace an electric or liquid propane water heater – you’ll cut your water heating costs by 50 percent or more!
Some older tankless heaters allowed the water temperature to vary depending on the amount of water being used. Newer models have modulating gas valves or sequential electric elements that produce more heat as water flow increases.
Maintenance costs are another bonus: Tankless heaters have a lifespan up to twice as long as conventional units, because there is no tank to rust or anode rod to replace. Back To Top
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