Video answer: Gas vs electric water heater (which is best?)
Top best answers to the question «Which is more efficient gas or electric tankless water heater»
- Electric tankless water heaters are, on average, more efficient. They can reach EF of 0.98, while gas-powered ones reach EF of 0.9.
Video answer: Tankless vs tank water heater
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Electric water heaters tend to have at least 98 thermal efficiency — many are 99 percent or more. In comparison, gas heaters usually have between 80 and 85 percent. Similarly, electric heaters can have higher energy factor ratings than gas heaters. All this can offset the higher cost of electric power to some extent.
Electric tankless water heaters are, on average, more efficient. They can reach EF of 0.98, while gas-powered ones reach EF of 0.9.
Electric water heaters require less space. Unlike electric heaters, gas water heaters can be dangerous to operate in small spaces that allow gas to build up. Electric tank heaters operate more efficiently than gas heaters. Gas heaters lose some of the heat they produce through venting, making them less efficient.
While they can be much more energy-efficient than a standard water heater, they’re more expensive to buy and install. Plus, they don’t work well in areas that experience extreme changes in temperatures. Also referred to as point-of-use (POU) water heaters, tankless water heater systems are available in electric and gas models.
How Efficient is an Electric Tankless Water Heater? Among electric, propane and natural gas instant hot water tankless water heaters, electric models tend to be the most energy-efficient type. The energy efficiency of gas and propane reaches around 80-85%, while the electric one reaches more than 98%, which refers to the low standby loss of heat.
Tankless water heaters are more efficient, but have high price tag. Tankless gas water heaters can be up to 22% more efficient than conventional models. However, the upfront cost is still high and maintenance costs may also be higher.
Typically, tankless water heaters provide hot water at a rate of 2–5 gallons (7.6–15.2 liters) per minute. Gas-fired tankless water heaters produce higher flow rates than electric ones. Sometimes, however, even the largest, gas-fired model cannot supply enough hot water for simultaneous, multiple uses in large households.
Propane Water Heaters cost more up front than electric water heaters. A gas water heater unit is about $850 on average, but more efficient models can cost up to $1,400. Electric water heaters cost about $650. Likewise, higher quality units can rise up to $1,500.
According to the U.S. Department of Energy, tankless water heaters can be between 8% and 50% more energy-efficient than tank-style water heaters, but the actual efficiency depends on the amount of hot water you use. If you use less than 41 gallons of hot water per day, a tankless heater is 24%-34% more efficient than a tank-style heater.
Energy-efficiency. Electric tankless water heaters are, on average, more efficient. They can reach EF of 0.98, while gas-powered ones reach EF of 0.9.
Water heaters use energy factors (EF) to measure a water heater’s energy efficiency. Traditional water heaters (natural gas and oil fired) have an energy factor (EF) of.53 to.70. Comparatively, energy-efficient gas water heaters have an EF of.67 or higher, while energy-efficient electric water heaters have an EF of 2.00 or 2.20, depending on tank size.
At present, a natural gas tankless water heater is about 10-15% cheaper to operate than an electric tankless heater. A tankless electric heater is generally cheaper than a propane tankless heater. It is important to keep in mind that electric tankless water heaters are generally 99%+ thermal efficient, whereas the efficiency rating of most gas tankless heaters, even the better quality units, range from about 80 to 85%.
In this case, a gas water heater is more efficient than the electric one. Usually, an electric water heater supplies 5 gallons of hot water per minute, whereas a gas tankless can supply up to 8 gallons per minute. Thus a gas-fueled water heater is the better match for multiple uses in a large family.
Electric water heaters require less space. Unlike electric heaters, gas water heaters can be dangerous to operate in small spaces that allow gas to build up. Electric tank heaters operate more efficiently than gas heaters.
It should be noted that if you choose to fuel your tankless water heater (s) with gas rather than electricity because of the lower relative cost of gas/propane then a whole house unit makes better sense. It will be more efficient and will save you the expense and hassle of trying to supply gas to 2 or 3 separate locations in the home.