Medium Tankless Water Heaters
Eternal
GU145(S)
This is a medium-sized gas-condensing tankless water heater.
Annual Energy Use (Therms/year):
156 Therms
Lifetime cost savings vs. Federal Minimum standard product:
$1,145
Lifetime Energy Savings Over Federal Minimum (Therms):
1,113 Therms
Lifetime energy savings vs. average Energy Star product:
346 Therms
The most efficient water heaters, ranked by Energy Factor, based on likely annual energy consumption. ENERGY STAR also uses this calculation.:
.96
Navien America
NP-180, NR-180
This is a medium-sized gas-condensing tankless water heater.
Annual Energy Use (Therms/year):
156 Therms
Lifetime cost savings vs. Federal Minimum standard product:
$1,145
Lifetime Energy Savings Over Federal Minimum (Therms):
1,113 Therms
Lifetime energy savings vs. average Energy Star product:
346 Therms
The most efficient water heaters, ranked by Energy Factor, based on likely annual energy consumption. ENERGY STAR also uses this calculation.:
.96
Navien America
NP-180A, NR-180A
This is a medium-sized gas-condensing tankless water heater.
Annual Energy Use (Therms/year):
159 Therms
Lifetime cost savings vs. Federal Minimum standard product:
$1,100
Lifetime Energy Savings Over Federal Minimum (Therms):
1,069 Therms
Lifetime energy savings vs. average Energy Star product:
303 Therms
The most efficient water heaters, ranked by Energy Factor, based on likely annual energy consumption. ENERGY STAR also uses this calculation.:
.94
Width (in.):
17"
Rinnai
RC80HPe, RC80HPi
This is a medium-sized gas-condensing tankless water heater.
Annual Energy Use (Therms/year):
161 Therms
Lifetime cost savings vs. Federal Minimum standard product:
$1,077
Lifetime Energy Savings Over Federal Minimum (Therms):
1,047 Therms
Lifetime energy savings vs. average Energy Star product:
281 Therms
The most efficient water heaters, ranked by Energy Factor, based on likely annual energy consumption. ENERGY STAR also uses this calculation.:
.93
Quietside
ODW-120A
This is a medium-sized gas-condensing tankless water heater.
Annual Energy Use (Therms/year):
165 Therms
Lifetime cost savings vs. Federal Minimum standard product:
$1,030
Lifetime Energy Savings Over Federal Minimum (Therms):
1,001 Therms
Lifetime energy savings vs. average Energy Star product:
235 Therms
The most efficient water heaters, ranked by Energy Factor, based on likely annual energy consumption. ENERGY STAR also uses this calculation.:
.91