Eternal has been a trusted name in water heaters since Founded 2009, based in United States. The brand is particularly known for Hybrid condensing water heaters that combine tankless efficiency with small buffer tank for instant hot water without cold-water sandwich. Eternal is positioned in the premium price tier, making it a premium investment for water heaters.
Eternal Water Heaters
Eternal manufactures hybrid condensing water heaters that pair a high-efficiency condensing burner with a small stainless steel buffer tank. This hybrid approach delivers instant hot water, eliminates cold-water sandwich, and achieves up to 0.96 UEF efficiency. Models are available in natural gas and propane configurations for residential and light commercial use.
PremiumTop-tier materials, design, and warranty
Eternal Water Heaters Product Lines
GU145GU195GU100 (Condensing Hybrid)
Why Choose Eternal for Water Heaters?
Eternal stands out in the water heaters market because of Hybrid condensing water heaters that combine tankless efficiency with small buffer tank for instant hot water without cold-water sandwich. Their products carry 3 industry certifications, including Energy Star, UL Listed, CSA Certified, giving homeowners confidence in quality and compliance. Eternal backs their water heaters with a 15-year limited warranty on heat exchanger; 5-year on parts, which shows commitment to long-term reliability. With 3 dedicated product lines — GU145, GU195, GU100 (Condensing Hybrid) — there's a Eternal option for virtually every need and budget.
Certifications & Standards
Energy StarUL ListedCSA Certified
Warranty & Support
Warranty15-year limited warranty on heat exchanger; 5-year on parts
Phone Support1-866-783-7636
Official Websitehttps://www.eternalwaterheater.com
Where to Buy Eternal Water Heaters
Water Heaters How-To Guides
View All →How to Adjust Water Temperature
Set your gas or electric water heater thermostat to the right temperature for comfort, safety, and lower energy bills -- plus how to verify the actual output with a thermometer.
How to Choose the Right Size Water Heater
Calculate the right water heater size so you never run out of hot water -- covers first-hour rating for tanks, GPM for tankless, quick sizing charts, and the mistakes that leave people taking cold showers.
How to Flush Your Water Heater
Flush sediment from your tank water heater to cut energy bills, eliminate rumbling noises, and add years to its life -- the most important maintenance task most homeowners skip.
Common Water Heaters Problems
View All →Leaking Water Heater
Water around the base demands immediate attention -- floor damage, mold, electrical hazards. Could be loose fittings, a failing T&P valve, a bad drain valve, or a rusted-through tank that needs replacement.
No Hot Water
No hot water from any fixture? Cause depends on gas vs. electric. Common culprits: pilot light out, tripped breaker, failed element, faulty thermostat or gas valve.
Pilot Light Won't Stay Lit
Lights but will not stay lit? Almost always the thermocouple -- a safety sensor that detects the pilot flame. When it fails, the gas valve shuts off. Straightforward DIY repair, under $25.
Water Heaters Types
View All →Water Heaters Buying Guides
View All →Eternal Water Heaters FAQ
Is Eternal a good brand for water heaters?
Eternal is a US-based manufacturer of hybrid condensing water heaters that combine tankless technology with a small storage buffer tank. Founded in 2009 and based in Commerce, California, Eternal's unique approach eliminates the cold-water sandwich effect common with traditional tankless units while maintaining high efficiency (up to 0.96 UEF). Their hybrid design provides instant hot water delivery with the energy savings of on-demand heating.
What warranty does Eternal offer on water heaters?
Eternal offers 15-year limited warranty on heat exchanger; 5-year on parts.
Where is Eternal made?
Eternal is based in United States, headquartered in Commerce, California.
What price range does Eternal water heaters fall into?
Eternal is positioned in the premium price tier for water heaters. You pay more but get superior quality, materials, and warranty coverage.
What water heaters product lines does Eternal offer?
Eternal offers 3 water heaters product lines: GU145, GU195, GU100 (Condensing Hybrid).
What certifications does Eternal have for water heaters?
Eternal holds 3 certifications including Energy Star, UL Listed, CSA Certified.