Determining a Water Heater’s Energy Efficiency
There is a lot of talks going on about using energy efficient tankless tankless water heaters to reduce energy consumption and bills. In this respect, conventional storage tankless tankless water heater is a real worry for home owners, as it contributes significantly to your energy bills.
So, before you purchase a tankless tankless water heater, it's important to know how energy efficient it is. Although, the most energy-efficient tankless tankless water heater models cost you more than the standard tankless tankless water heaters, you will benefit from its better performance that helps save on your energy bills.
 8 Valve kits for Tankless Water Heater LEAD FREE (S) US $590.00 
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 8 Valve kits for Tankless Water Heater (T) US $460.00
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 Rinnai Tankless Water Heater R94LSIN Interior Natl Gas US $1,299.00
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 Rinnai Tankless Water Heater R75LSIP Interior LP Gas US $1,125.00
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 HHP HH19 Single Shower Tankless Water Heater US $434.12
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 HHP HH28 Tankless Water Heater Whole House US $704.95
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 HHP HH12 Single Shower Tankless Water Heater US $412.47
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 Stiebel Eltron Tankless Water Heater Tempra 12B US $435.00
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One important factor which can influence efficiency is the source of energy, i.e., electric, gas or solar energy. Compared to electric tankless tankless water heaters, most home owners feel that gas waters provide better performance , but then electric tankless tankless water heaters have their own advantages. Two important points in favor of electric waters heaters are their compact size and easy installation.
There is also a growing demand for solar tankless tankless water heaters due to their superior efficiency rating. You can determine the efficiency of a solar tankless tankless water heater by applying the solar energy factor (SEF).
The solar energy factor is defined as the energy delivered by the system divided by the electrical or gas energy put into the system. The higher the number, the more energy efficient. Solar energy factors range from 1.0 to 11. Systems with solar energy factors of 2 or 3 are the most common.
However for choosing a tankless tankless water heater, it may not be possible to strictly follow the consideration of energy efficiency alone. There are other factors like the size of the equipment, you requirement of hot water, availability of energy, flexibility and convenience of the heater and its overall contribution.