WaterClue is reader-supported. As an Amazon Associate we earn from qualifying purchases. Amazon prices and product images are sourced live from the Amazon Product Advertising API and may not reflect current Amazon listings — confirm price and availability at Amazon before purchase. Full affiliate disclosure.

Size Calculator Best-Of
Lochinvar

Lochinvar EnergyRite ERN-301 75-Gallon Commercial Gas Water Heater

Model ERN-301
4.2/5 from 70 ratings
from Check current price
Price via Amazon
Check Price on Amazon
Free shipping with Amazon Prime · 30-day returns
Btu
300000
Venting
Atmospheric
Fuel Type
Natural Gas
Tank Type
Commercial
Energy Factor
0.81
Warranty Years
5

Lochinvar EnergyRite ERN-301 75-Gallon Commercial Gas Water Heater Review

The Lochinvar EnergyRite ERN-301 75-Gallon Commercial Gas Water Heater is a commercial-grade large-capacity gas tank from Lochinvar. EnergyRite identifies the residential-commercial crossover line.

Specs: 75 gallons stored, 300,000 BTU input, UEF 0.62, 290-gallon FHR, 3-year commercial tank warranty. Power-vent PVC venting.

The 300K BTU burner produces extremely fast recovery — appropriate for light commercial applications or very-large residential with extreme overlapping demand. Far exceeds typical residential needs.

About $3,500 unit, $5,500-$7,500 installed depending on commercial gas line and venting work. Right buyer: light commercial application with substantial 75-gallon-class continuous demand.

Pros
  • Natural gas combustion — faster recovery than electric resistance at comparable tank size
  • 75-gallon capacity — right-sized for 3–4 person households with standard usage patterns
  • High 300K BTU input — rapid recovery for large-volume commercial-residential applications
Cons
  • 5-year warranty — below the 8–12 year average for premium models in this class
  • Atmospheric venting requires vertical B-vent — less routing flexibility than power-vent or condensing alternatives

Full Specifications

Brand
Lochinvar
Model Number
ERN-301
Btu
300000
Venting
Atmospheric
Fuel Type
Natural Gas
Tank Type
Commercial
Energy Factor
0.81
Warranty Years
5
Capacity Gallons
75

Similar Water Heaters

Rinnai

Rinnai RU199iN Sensei Tankless Water Heater

199000 Natural Gas Tankless
Check current price
4.8
View Details
Rheem

Rheem Marathon Lifetime 50-Gallon Electric Water Heater

4500 Electric Tank
Check current price
4.8
View Details
Triangle Tube

Triangle Tube Smart 80 Indirect Water Heater 80-Gallon

Indirect Indirect 0.88
Check current price
4.7
View Details