Products
All the right choices.
No matter which Eternal you choose, you'll get endless hot water, consistent pressure and never a cold water sandwich. When installed in optional recirculation, you'll save water by never waiting for hot water again.
The Future is Here - 98%+ Efficient - Eternal Condensing Hybrid
Clean
- 316L Stainless Steel Heat Exchanger w/built in 2 gallon reserve tank
- Meets NSF Standards for health and cleanliness
- Ultra low emissions (1ppm CO) leaves almost no carbon footprint and is safe
- Patented self-cleaning utilizes turbulent flow to flush sediments out
Clever
- 98%+ Efficiency saves cost, exceeds Energy Star standards, and qualifies for Tax and LEED credits
- Compact chassis can wall or floor mount; standard water connects on top
- Flexible NG / LP / Indoor / Outdoor / Direct Vent / Power Vent conversions in one unit
- 2" PVC up to 35ft or 3" PVC venting up to 100ft
- Dual Core CPU displays error codes and optionally controlled by up to 3 remotes
- Clip-on components can be easily serviced by technicians
Confident
- Full flow design enables high output without water pressure drop
- Thermostat and Flow Activation is compatible with WaterSense fixtures
- Easy integration with recirculation and no startup lag eliminates cold water sandwich
- Meets UL / CSA / ANSI / NSF and UPC standards
- Industry's BEST 20 year residential and 10 year commercial Heat Exchanger warranty
Models and Features
- Up to 14.5 GPM of unrestricted flow
- 145,000 BTU's Max Input
- Great for up to 3 simultaneous residential applications
- Copper internal piping connections
- Available S Option Factory Installed 316L Stainless Steel internal piping connections
GU145 (S) 
GU195 (S,M) 
- Up to 19.5 GPM of unrestricted flow
- 199,000 BTU's Max Input
- Great for heavy residential or light commercial up to 5 simultaneous applications
- 316L Stainless Steel internal piping connections
- Available M Option Factory Installed Multi Control Unit module for up to 8 x GU195M in network for heavy commercial
Back to top The Original Eternal Hybrid™ – 86%+ Efficient, Available in Power Vent or Direct Vent
Endless
- Consistent water pressure even with multiple taps in use
- Compact yet capable of replacing multiple tanks
- Compatible with recirculation to deliver hot water quickly without wait
- Faster hot water delivery than competing tankless units
Efficient
- Maintains 86% efficiency use after use with patented self cleaning
- Ultra low emission as low as 3ppm NOx to reduce carbon footprint
- Pre-Mix full modulation infrared burner precisely matches fuel usage to demand
- Easy installation with 4" PVC venting, suitable for indoor or outdoor use
- Convertible to LP with optional kit
Reliable
- All stainless steel construction is durable and clean
- Computer controlled mixing valve and multiple sensors ensures precise water temperature
- Digital display is easy to set and displays errors for simple troubleshooting
- Backed by industry's best 20 year residential and 10 year commercial Heat Exchanger warranty
Original Eternal Hybrid™ Models
GU20(DV) 
- Up to 12.8 GPM of unrestricted flow
- 145,000 BTU's Max Input w/3.8 G storage - convertible from GU26
- Great for up residential to 2.5 simultaneous applications
- Qualifies for up to $1,500 Federal tax credit (Power Vent only)
GU26(DV) 
- Up to 15.8 GPM of unrestricted flow
- 180,000 BTU's Max Input w/3.8G storage
- Great for light commercial or residential up to 4 simultaneous applications
- Qualifies for up to $1,500 Federal tax credit (Power Vent only)
GU28(DV)
- Up to 17.5 GPM of unrestricted flow
- 199,000 BTU's Max Input w/6.4G storage - convertible from GU32
- Great for light commercial up to 5 simultaneous applications
GU32(DV) 
- Up to 20.5 GPM of unrestricted flow
- 236,000 BTU's Max Input w/6.4G storage
- Great for light commercial up to 6 simultaneous applications
The original Eternal Hybrid™ shook up the industry in 2006. It even caught the attention of Extreme Makeover: Home Edition designer Ed Sanders.
We break the laws of physics by taking an opposite approach to water heating. Compare the Eternal difference to how other water heaters work. 
Want to see what actual customers think of their Eternal Hybrid™? Read our most recent reviews posted by owners and check out our testimonials section.
