a d v a n c e d w a t e r h e a t i n g

e t e r n a L h Y B r i d™

EtErnal hybrid™ is thE only watEr hEating systEm that combinEs thE bEst of tank and tanklEss fEaturEs in onE.

ta n K + ta n K L e s s = e t e r n a L h Y B r i d™

a d va n c e d : t e c h n o L o g Y

The patented, powerful design is engineered to replace multiple tanks, use

less energy and space than one tank and produce endless hot water for

multiple applications at once.

2

* PV model shown

*

43

how is thE EtErnal hybrid™ diffErEnt from convEntional singlE-pass watEr hEatErs?

Tank water heaters utilize a single‑pass heat exchanger.

Heat is produced from the bottom, then rises through

50 –100 gallons of cold water and exhausts through the

top. Heat and energy is transferred just once and wasted

in the form of high temperature fumes.

Cold water is deposited from the top and rests at the

bottom, resulting in sediment build‑up that erodes efficiency,

durability and performance with each use. The design limits

a tank’s ability to produce endless hot water.

Tankless water heaters also exhaust heat with a single‑pass

process. Heat produced by the bottom burner rises through

slow moving cold water. Heat and energy is transferred just

once and wasted in the form of high temperature fumes

similar to a conventional tank. Water pressure is reduced as

water winds through the coiled copper heat exchanger and

the copper pipes eventually fail due to scale build‑up. The

design limits the ability of the tankless to provide consistent

hot water to multiple applications.

c o n v e n t i o n a L w at e r h e at e r s

ta n K ta n K L e s s

HOT OUT

WASTED HEAT

COLD IN

WATER CAVITY

BURNER

COLD IN

HOT OUT

BURNER

FAN

4

Eternal hybrid is a more effective water heating

system. The advanced multi‑pass heat exchanger

drives heat downward then recycles it through 44

baffled stainless steel pipes for maximum efficiency.

Water spreads thinly and evenly around the 44

heating pipes to absorb heat quickly. Cold water

flows from the bottom up to prevent sedimentation

build‑up associated with other designs and the

straight water‑flow design eliminates pressure loss

associated with coiled pipes. And because water

flows around the pipes — not through them — there

is no risk of build‑up inside the pipes.

Water fills the reservoir from bottom up and

spreads evenly around the 44 heating pipes;

producing endless hot water with consistent

pressure and temperature

The advanced multi‑pass heat exchanger

drives heat downward then recycles it through

44 baffled pipes for maximum efficiency

P a t e n t e d c o u n t e r‑ f l o w »

technology maintains 86%

efficiency and delivers hot

water faster than tankless

units for multiple applications

at once

Half the size of a 50 gallon »

tank water heater with 300%

higher output

Built‑in reservoir eliminates »

cold water sandwich and

allows you to build a recircu‑

lation system with no external

electric tank

Multistage safety features »

E x t re m e l y l o w e x h a u s t »

temperature allows Eternal to

a d va n c e d : e t e r n a L h Y B r i d™ s Y s t e m

be PVC vented for easier, more

economical installs

Near zero greenhouse gas »

emissions means Eternal is

one of the cleanest burning

appliances on the market

Stainless steel reservoir is self »

cleaning, maintenance free

and backed with a 20 year

no‑leak warranty on stainless

steel heat exchanger tank for

residential, 10 year warranty for

commercial

Limited 3 year warranty on all »

other parts

1 year warranty on reasonable »

labor

Eternal hybrid works on‑demand and uses a

state‑of‑the‑art modulating infrared burner

that is triggered by water‑flow or thermostat.

This premium stainless steel burner is a key

to Eternal hybrid’s precise, safe and clean

performance

* PV model shown

*

Triple stage overheat protection »

Oxygen depletion sensor »

Double stage gas valve »

Combustion fan rpm check »

Vent blockage detection »

Temperature and pressure relief valve »

Computer controlled temperature sensors »

Computer controlled mixing valve »

Precise digital temperature settings from 100 to 167°F in 15 steps »

Error code display for easy troubleshooting »

on-board intElligEncE monitors pErformancE and rEsponds to changing conditions to EnsurE safE, rEliablE and prEcisE opEration. EtErnal doEs thE worrying and troublEshooting so you don’t havE to.

TURBO: The fan pressure injects perfectly premixed a i r and fue l in to the Eterna l combustion chamber. This process creates far fewer by‑products and better heat output than conventional methods

HEAT EXCHANGER TANK: The powerful and compact design produces an endless flow of hot water at your specified temperature setting

SIROCCO EXHAUST

DOUBLE STAGE GAS VALVE: The two stage design ensures your safety. If one stage fails, the second stage will shut down the flow of gas in case of emergency

MIXING VALVE: This electronically controlled valve will draw cold water to lower the tem‑perature of the water flowing to the outlet if the system determines the temperature to be higher than desired setting

HOT WATER FLOW

COLD WATER FLOW

GAS FLOW

LEAKAGE BREAKER: This protective device is wired directly to the transformer. Any eletric‑ity leakage will cause the breaker to shut the system down at the power source

DC TRANSFORMER: The transformer filters out surges from A/C current and provides steady power to the system. The system also has a power‑out memory feature so you won’t need to reset the system after a blackout

6a d va n c e d : s a f e t Y & p r e c i s i o n

60°

1min

4min

8min

80°

70°

100°

110°

ETERNAL

90° 91°91°

104° 104°104° 104°

96°96°

91°91°

104°104°

98°98°

98°98°

75°75°

TANKLESSTANK

40%

60%

80%

100%

1TAP

2 TAPS

3 TAPS

98%

92%

80%

98%

76%

47%

98%

92%

80%

98%

76%

47%

ETERNALTANKLESS

90°

95°

100°

105°

2 GPM

3.4 GPM

4 GPM

103°

101°

99°

103°

98°

91°

103°

101°

99°

103°

98°

91°

ETERNALTANKLESS

90°

95°

100°

105°

2 GPM

3.4 GPM

4 GPM

104°

101°

99°

104°

98°

91°

104°

101°

99°

104°

98°

91°

ETERNALTANKLESS

60°

1MIN

4MIN

8MIN

80°

70°

100°

110°

ETERNAL

90°91°91°

104°104° 104°104°

96°96°

91°91°

104°104°

98°98°

98°98°

75°75°

TANKLESSTANK

40%

60%

80%

100%

1TAP

2 TAPS

3 TAPS

98%

92%

80%

98%

76%

47%

98%

92%

80%

98%

76%

47%

ETERNALTANKLESS

90°

95°

100°

105°

2 GPM

3.4 GPM

4 GPM

103°

101°

99°

103°

98°

91°

103°

101°

99°

103°

98°

91°

ETERNALTANKLESS

prEssurE maintainEd at hot outlEt

This graph illustrates the difference of inlet and outlet

pressures between Eternal and tankless. Note that

as demand increases, the tankless unit starts to lose

pressure at the outlet.

tEmpEraturE variation ovEr flow (°f)

The temperature variation across different flow

rates of mixed hot and cold water usage mimics the

pressure drop pattern seen above. Note that under

higher demand, the shower temperature cooled by

13 degrees with the tankless.

tEmpEraturE variation ovEr timE (°f)

This graph shows how all 3 types of water heaters

perform over time. Only shower tap is used for the

first 3 minutes and additional taps are opened at 4

minutes. The temperature variation is most noticeable

on the tankless; however, as time progresses, the

storage tank water heater runs out of hot water.

EtErnal hybrid™ is EnginEErEd to out-pErform all othEr watEr hEatErs on thE markEt.

7a d va n c e d : s a f e t Y & p r e c i s i o n a d va n c e d : p e r f o r m a n c e

ETERNAL HYBRID TANKLESS TANK

KEY CONSTRUCTION MATERIAL Stainless Steel Copper Steel

EFFICIENCY 86% Avg. 80% Avg. 60%

NITROUS OXIDE EMISSIONS (PPM) 5 – 30 30 – 40 60 – 90

CARBON MONOXIDE EMISSIONS (PPM) 40 – 45 190 – 200 200 – 250

EXHAUST TEMP (°F) 128 – 155 390 – 410 480 – 500 COMPARISONS SHOWN ARE AVERAGED BASED ON TYPICAL TANK AND TANKLESS UNITS

LOW NOx

HYBRID

CERTIFIED TO MEET SCAQMD LOW EMISSIONS STANDARD

Did you know that home appliances are the fastest growing group of pollution emitters after automobiles? The Union of

Concerned Scientists has stated if homes in the US replaced their existing appliances with more efficient models, 175

million tons of heat‑trapping gases would be eliminated. Nitrous Oxide (NOx) is identified by the EPA as one of the six

main pollutants, and is a contributor to global warming, acid rain, as well as other environmental and respiratory problems.

According to SCAQMD, (South Coast Air Quality Management District) a water heater should have 55ppm NOx under

maximum combustion. At its lowest, Eternal hybrid emits 5ppm NOx. The low emissions mean Eternal is a highly efficient

product that keeps our environment clean and rewards you with energy savings.

8a d va n c e d : g r e e n L i v i n g

typical installationpv modEl

i n s ta L L at i o n r e q u i r e m e n t s

a licEnsEd plumbEr familiar with tank watEr hEatErs can install EtErnal Easily. EtErnal is prE-sEt for ng (optional lp convErsion kit availablE for pv modEls, lp convErsion kit includEd for dv modEls) and can bE installEd indoors or outdoors (outdoor kit rEQuirEd) for maximum flExibility on thE jobsitE.

gas supply

Requires a ¾" gas connection and

suff ic ient gas supply for opt imal

performance; Sufficient BTU supply

is crucial to proper installation and

operation of the unit.

watEr supply

Requires ¾" water connections. A

Thermal Expansion Tank may be

required by your local code.

ElEctricity supply

R e q u i re s 1 2 0 VA C ( 6 0 H z ) 0 . 7 A

electrical supply and must be grounded

to operate properly. Includes 5' cord

with standard 3‑prong connector.

combustion air supply

Eternal draws combustion air from its

surrounding. Please ensure sufficient air

flow as shown in the Operator’s Manual

and install Eternal in accordance with

code ventilation requirement.

unit clEarancE

Install Eternal in accordance with code

requirement and the manufacturer’s

recommended clearance as shown in

the Operator’s Manual and labeled on

the unit itself.

vEnting matErial

Eternal can be installed with either

4" Schedule 40 PVC, CPVC or ABS

venting. Termination can be either

horizontal or vertical.

rEcirculation

Built‑in reservoir tank makes Eternal

ideal for closed loop systems.

TEMPERATURE AND PRESSURE RELIEF VALVE

3/4" HOT WATER OUTLET

RELIEF VALVE DISCHARGE

* PV model shown

*

3/4" COLD WATER SUPPLY

PVC VENT

3/4" GAS SUPPLY

DRAINING VALVE

9a d va n c e d : g r e e n L i v i n g

EtErnal GU32 EtErnal GU28 EtErnal GU26 EtErnal GU20 EtErnal GU32DV EtErnal GU28DV EtErnal GU26DV EtErnal GU20DV

THERMAL EFFICIENCY 86%

INSTALLATION Indoor/Outdoor (outdoor kit req., sold separately) Indoor Only

FLUE SYSTEM Forced Exhaust Power Vent Sealed Combustion Direct Vent

CONNECTION REQUIREMENTS

GAS 3/4" Female

WATER 3/4" Female, 15 to 150 Psi

VENT 4" Schedule 40 PVC, CPVC or ABS

ELECTRICITY 120VAC (60 Hz) 0.7A. Includes 5' cord with standard 3‑prong connector, Standby ‑ 8 watts, Maximum ‑ 105 watts

GAS TYPE Pre‑set for NG / LP conversion kit sold separately Pre‑set for NG / LP conversion kit included

MAXIMUM / MINIMUM GAS RATE (INPUT BTU’S)

236,000 / 47,500

199,000 / 47,500

180,000 / 47,500

145,000 / 47,500

236,000 / 47,500

199,000 / 47,500

180,000 / 47,500

145,000 / 47,500

RESERVE TANK SIzE (GAL) 6.4 3.8 6.4 3.8

GAS PRESSURE REQUIREMENT NG: 3.5" – 10.5" W.C. LP: 8" – 14" W.C.

GPM CAPACITY RANGE 0.1 – 20.8 0.1 – 17.5 0.1 – 15.8 0.1 – 12.8 0.1 – 20.8 0.1 – 17.5 0.1 – 15.8 0.1 – 12.8

IGNITION SYSTEM Electronic Direct Ignition

TEMPERATURE RANGE 100 – 167 in 15 steps

UNIT WEIGHT (LBS) 172.9 145.6 180.2 151.8

DIMENSION (HXWXD) 40.9" x 17.3"x 22.8" 33.5” x 17.3” x 22.8” 40.9” x 17.3”x 22.8” 33.5” x 17.3” x 22.8”

25.0

20.0

15.0

10.0

5.0

0.0

GU32/32DV

GU20/20DVGU26/26DVGU28/28DV

Temperature Rise (°F)

Gal

lons

Per

Min

ute

20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 125 130 135 140

Brochure Ver: 06‑04‑09jm Part Number: BRCA01

US Patent No 6,945,197 / © 2009 Grand Hall · In the interest of product development, Eternal product designs, features and specifications are subject to change without notice.

Grand Hall USA, Inc. · 3838 W. Miller Road · Garland, Texas, 75041 · Tel: 1‑866‑946‑1096 · Fax: 972‑279‑8440 · Email: eternalsales@grandhall.com · www.eternalwaterheater.com

ETERNAL HOT WATER FLOW RATE DATA

Key temp (°f) rise points

20°f rise

35°f rise

45°f rise

50°f rise

60°f rise

70°f rise

80°f rise

90°f rise

eternal gu32/gu32dv

20.8 gpms

12.1 gpms

9.4 gpms

8.3 gpms

7.0 gpms

6.0 gpms

5.2 gpms

4.6 gpms

eternal gu28/gu28dv

17.5 gpms

10.0 gpms

7.8 gpms

7.0 gpms

5.8 gpms

5.0 gpms

4.4 gpms

3.9 gpms

eternal gu26/gu26dv

15.8 gpms

9.5 gpms

7.4 gpms

6.3 gpms

5.3 gpms

4.6 gpms

4.0 gpms

3.5 gpms

eternal gu20/gu20dv

12.8 gpms

7.3 gpms

5.7 gpms

5.1 gpms

4.3 gpms

3.6 gpms

3.2 gpms

2.8 gpms

p r o d u c t s p e c i f i c at i o n s

EtErnal CErtIFICatIOnS & InDUStrY aSSOCIatIOnSISO 9001