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Leading Water Heating Technologies and Estimated Cost of Ownership
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Energy Source |
|
Water Heater Type |
Energy Factor |
Installed Cost |
Energy Cost per year |
Life Expectancy (years) |
Cost of Ownership
at 20 years |
| Natural Gas |
1 |
Demand Gas (tankless) |
80% |
$1,600 |
$262 |
20 |
$6,840 |
| 2 |
Condensing Gas Tank |
86% |
$2,000 |
$244 |
13 |
$8,880 |
| 3 |
High Efficiency Gas Tank |
65% |
$1,025 |
$323 |
13 |
$8,510 |
| 4 |
Conventional Gas Tank |
60% |
$850 |
$350 |
13 |
$8,700 |
| Electric |
5 |
Electric HPWH |
220% |
$1,660 |
$190 |
13 |
$7,120 |
| 6 |
Geyser HPWH* |
280% |
$1,999 |
$181 |
20 |
$5,619 |
| 7 |
High Efficiency Electric Tank |
95% |
$820 |
$439 |
13 |
$10,420 |
| 8 |
Low Efficiency Electric Tank |
90% |
$750 |
$463 |
13 |
$10,760 |
| Solar |
9 |
Solar with Electric Back-up |
120% |
$4,800 |
$175 |
20 |
$8,300 |
| Oil |
10 |
Conventional Oil Fired Tank |
55% |
$1,400 |
$654 |
8 |
$17,280 |
Source: (Energy Efficiency and Renewable Energy, 2008)
ENERGY STAR defines the Energy Factor (EF) as "the ratio of useful energy output from the water heater to the total amount of energy delivered to the water heater"
*Geyser HPWH: Coefficient of Performance 400% - Energy Factor 280% @ 60°F inlet water, 75°F ambient air temperature, 50% relative humidity @120°F - List Price $1,999
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