Intellihot iQ250D Specification sheet

To avoid product damage, personal injury, or
even possible death, carefully read, understand,
and follow all the instructions in the Installation
and Operation manuals before installing this
product. Improper installation, adjustment, alteration, or
maintenance can cause injury, loss of life, and/or property
damage. This water heater should be installed and
serviced by a qualified technician. The lack of proper
service can result in a dangerous condition.
This manual contains safety information, installation
instructions, and maintenance procedures. It must be left
with the homeowner or placed near the water heater in
a noncombustible place. The customer should retain this
manual for future reference.
WARNING
If the information in these instructions is not followed
exactly, a fire or explosion could result causing
property damage, personal injury, or death.
— Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any
other appliance.
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use
any phone in your building.
• Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
instructions.
• If you cannot reach your gas supplier, call the
fire department.
— Installation and service must be performed by
a qualified installer, service agency, or the gas
supplier.
FACTORY PRESET FOR USE WITH
NATURAL GAS
Direct-Vent Automatic Instantaneous Water Heater
(Chauffe-eau automatique instantané à ventilation directe)
FOR INDOOR INSTALLATIONONLY
(POUR INSTALLATION À L'INTÉRIEUR SEULEMENT)
120 Volt, 60 Hz, 5 Amps
Type of Gas
(Type de gaz)
: . . . . . . . . . . . . . . . .
Input Rating
(Entrer le Classement)
: Btu/hr Maximum . . .
Btu/hr Minimum . . .
Maximum Inlet Gas Pressure: . . . . . . . . . . . .
Minimum Inlet Gas Pressure: . . . . . . . . . . . .
Minimum Inlet Gas Pressure (for adjustments): . .
Maximum Water Pressure: . . . . . . . . . . . . .
Minimum Water Pressure: . . . . . . . . . . . . .
Recovery Rating: . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . .
Thermal Efficiency / :Energy Factor:
NOx Emissions:
. . . . . . . .
(Pursuant to South CoastAir Quality Management District Rule 1146.2)
(Moins de 20 ppm)
(Jusqu'à 98 % / 0.94) (Jusqu'à 98 % / 0.94)
(Moins de 20 ppm)
(Dégagements minimums)
(Des non-combustibles) (D'une construction
combustible)
(conformémentau règlement 1146.2 du "South Coast Air Quality Management District)
Top of heater
Minimum Clearances
From
Non-Combustibles
From Combustible
Construction
(Dessus du chauffe-eau)
Back of heater
(Arrière du chauffe-eau)
Front of heater
(Avantdu chauffe-eau)
Bottom of cabinet
(Côté canalisation)
Side (Côté)
5/8 in (15.8 mm)
6 in (15.2 cm)
6 in (15.2 cm)
2 in (50.8 mm)
12 in (30.4 cm)
5/8 in (15.8 mm)
6 in (15.2 cm)
2 in (50.8 mm)
1/2 in (12.7 mm)
12 in (30.4 cm)
Intellihot Green Technologies Inc.
2900 W. Main St.
Galesburg, IL 61401
Phone: [phone]
Email: [email protected]
Web: www.intellihot.com
Factory Preset
Natural Gas
(Réglage en usine pour gaz naturel)
199,000
20,000
13.0 W.C. (3.20 kPa)
8.0 W.C. (2.00 kPa)
8.0 W.C. (2.00 kPa)
150 psi (1034 kPa)
15 psi (103 kPa)
265 GPH (1003 LPH)
Up to 98% / 0.94
Less than 20 ppm
Field Conversion* to
Propane Gas
(Conversion* sur place au gaz propane)
199,000
20,000
10.5 W.C. (2.62 kPa)
3.0 W.C. (0.76 kPa)
11.0 W. C. (2.74 kPa)
150 psi (1034 kPa)
15 psi (103 kPa)
265 GPH (1003 LPH)
Up to 98% / 0.94
Less than 20 ppm
Check Box if
Converted to
Propane Gas
*Refer to Installation and Operation
manual for conversion procedure.
(Se référer au manuel d'installation et
de fonctionnement pour la procédure de
conversion.)
PRÉRÉGLAGES D'USINE POUR UTILISATION AVEC
GAZ NATUREL
(Pression de gaz d'arrivée maximum)
(Pression d'eau maximum)
(Pression d'eau minimum)
(Caractéristique de recouvrement)
(Efficacité thermique / Facteur énergétique)
(Émissions de NOx)
(Pression de gaz d'arrivée minimum)
(Pression de gaz d'arrivée minimum (pour ajustements))
Cocher la case si converti au gaz propane
ETL STICKER
Serial Number:
IGT-LBL-0005-01
(Numéro de série)
(Collant ETL)
Operation and
Installation
Manual
Model: iQ250D
This product complies with ANSIZ21.10.3
(2011) / CSA 4.3 Gas Water Heater. For use as
portable water heating.
Smart. Ecient. Endless
— Ne pas entreposer ni utiliser d’essence ou
ni d’autres vapeurs ou liquides inflammables
à proximité de cet appareil ou de tout autre
appareil.
QUE FAIRE SI VOUS SENTEZ UNE ODEUR DE GAZ
• Ne pas tenter d’allumer d’appareil.
• Ne touchez à aucun interrupteur; ne pas vous
servir des téléphones se trouvant dans
le bâtiment.
• Appelez immédiatement votre fournisseur de gaz
depuis un voisin. Suivez les instructions
du fournisseur.
• Si vous ne pouvez rejoindre le fournisseur,
appelez le service des incendies.
— L’installation et l’entretien doivent être assurés
par un installateur ou un service d’entretien
qualifié ou par le fournisseur de gaz.
AVERTISSEMENT
Assurez-vous de bien suivre les instructions données
dans cette notice pour réduire au minimum le
risque d’incendie ou d’explosion ou pour éviter tout
dommage matériel, toute blessure ou la mort.
Certified to
NSF/ANSI 372

3
Table of Contents
1. General Information
1.1 Items Shipped With Water Heater . . . . . . . . . . . . . . . 4
1.2 Contact Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.3 Serial Number Plate Locations . . . . . . . . . . . . . . . . . . 4
2. Safety
2.1 Safety Signal Words . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2 Installation Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3. Technical Data
3.1 Specications Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.2 High Elevation Installations. . . . . . . . . . . . . . . . . . . . . 7
3.3 Dimensional Specications . . . . . . . . . . . . . . . . . . . . . 8
3.4 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4. Preparation Before Installation
4.1 Selecting an Installation Site. . . . . . . . . . . . . . . . . . . 10
5. Wall Mounting
5.1 Clearance Requirements. . . . . . . . . . . . . . . . . . . . . . . 11
5.2 Mounting the Unit to the Wall . . . . . . . . . . . . . . . . . 11
6. Gas Connections
6.1 Installation Guidelines. . . . . . . . . . . . . . . . . . . . . . . . . 12
6.2 Excess Flow Valve (EFV). . . . . . . . . . . . . . . . . . . . . . . . 12
6.3 Gas Pipe Sizing Tables . . . . . . . . . . . . . . . . . . . . . . . . . 13
6.4 Gas Pressure Regulator . . . . . . . . . . . . . . . . . . . . . . . . 14
6.5 Venting of Gas Supply Regulators. . . . . . . . . . . . . . 14
7. Venting and Materials
7.1 Venting Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
7.2 Exhaust Vent Materials . . . . . . . . . . . . . . . . . . . . . . . . 15
7.3 Air Intake Vent Materials. . . . . . . . . . . . . . . . . . . . . . . 15
7.4 Venting Congurations. . . . . . . . . . . . . . . . . . . . . . . . 16
7.5 Two Pipe Vent System (Direct Vent) . . . . . . . . . . . . 16
7.6 Venting Termination. . . . . . . . . . . . . . . . . . . . . . . . . . . 19
7.7 Venting Clearance Specications . . . . . . . . . . . . . . 21
7.8 Common Venting for Multiple Units. . . . . . . . . . . . 22
8. Water Connections
8.1 Water Line Connection Guidelines . . . . . . . . . . . . . 26
8.2 Water Quality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
8.3 Hot Water Side Connection . . . . . . . . . . . . . . . . . . . . 26
8.4 Cold Water Side Connection . . . . . . . . . . . . . . . . . . . 27
8.5 Condensate Line Installation. . . . . . . . . . . . . . . . . . . 27
8.6 External Recirculation Options. . . . . . . . . . . . . . . . . 28
9. Electrical
9.1 Electrical Code Requirements. . . . . . . . . . . . . . . . . . 30
9.2 Electrical Connection and Polarity . . . . . . . . . . . . . 30
10. Propane (LPG) Conversion
10.1 General Information. . . . . . . . . . . . . . . . . . . . . . . . . . . 31
10.2 Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
11. Adjusting CO2Level
11.1 General Information. . . . . . . . . . . . . . . . . . . . . . . . . . . 32
11.2 Procedure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
12. Operation
12.1 Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
12.2 Display Icons. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
12.3 Turning Water Heater ON and OFF . . . . . . . . . . . . . 35
12.4 Resetting (Clear) Error Codes . . . . . . . . . . . . . . . . . . 35
12.5 Setting the Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
12.6 Adjusting the Water Temperature . . . . . . . . . . . . . . 35
12.7 Real Time Temperature and Flow of the System 36
12.8 Error Screen. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
13. Programming
13.1 Modes of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
13.2 Viewing and Setting Modes of Operation . . . . . . 37
14. Maintenance
14.1 Draining the Water Heater . . . . . . . . . . . . . . . . . . . . . 42
14.2 Filling the Water Heater . . . . . . . . . . . . . . . . . . . . . . . 42
14.3 Descaling the Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
15. Troubleshooting
15.1 Error Code Chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
15.2 Wiring Diagram Chart . . . . . . . . . . . . . . . . . . . . . . . . . 45
15.3 Operational Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 46
16. Serviceable Parts
16.1 Electrical Components . . . . . . . . . . . . . . . . . . . . . . . . 47
16.2 Water Lines and Fittings . . . . . . . . . . . . . . . . . . . . . . . 48
16.3 Blower, Gas Valve, and Exhaust. . . . . . . . . . . . . . . . . 49
16.4 Ignition Components. . . . . . . . . . . . . . . . . . . . . . . . . . 50
17. Requirements for State of Massachusetts . . .51
18. Warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
19. Product Warranty Card. . . . . . . . . . . . . . . . . . . . .55

4
1. General Information
1.1 Items Shipped With Water Heater
The following items are shipped with the water heater; upper
mounting bracket (1), condensate drain (2), communication
cable (3), and Operation and Installation manual (4).
Note: Items 5 through 8 are spare parts shipped with the
unit. Two buss fuses, 10 Amp (5), electrode seal (6),
O-rings #015 (7), and face seals (8).
IQ-007
1
2
3
56
7
8
SPARES
4
To avoid product damage, personal injury, or
even possible death, carefully read, understand,
and follow all the instructions in the Installation
and Operation manuals before installing this
product. Improper installation, adjustment,alteration, or
maintenancecan cause injury,lossof life, and/or property
damage.Thiswater heater should be installed and serviced
ed technician. The lack of proper service can
result in a dangerous condition.
This manual contains safety information, installation
instructions, and maintenance procedures. It must be left
with the homeowner or placed near the water heater in a
noncombustible place. The homeowner should retain this
manual for future reference.
WARNING
Ifthe information in these instructions is not followed
exactly, afireor explosioncould resultcausing
propertydamage, personal injury, or death.
—
Donot store or use gasoline or other flammable
vaporsand liquids in the vicinity of this or any
otherappliance.
WHATTO DO IF YOU SMELL GAS
•
Donot try to light any appliance.
•
Do not touch any electrical switch; do not use
anyphone in your building.
•
Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
instructions.
•
Ifyou cannot reach your gas supplier, call the
firedepartment.
—
Installationand service must be performed by
aqualifiedinstaller, service agency, or the gas
supplier.
— Ne pas entreposer ni utiliser d’essence ou
ni d’autres vapeurs ou liquides inflammables
àproximité de cet appareil ou de tout autre
appareil.
QUEFAIRE SI VOUS SENTEZ UNE ODEUR DE GAZ
•
Nepas tenter d’allumer d’appareil.
•
Ne touchez àaucun interrupteur; ne pas vous
servir des téléphones se trouvant dans
lebâtiment.
•
Appelezimmédiatement votre fournisseur de gaz
depuis un voisin. Suivez les instructions
dufournisseur.
•
Sivous ne pouvez rejoindre le fournisseur,
appelezle service des incendies.
— L’installation et l’entretien doivent être assurés
parun installateur ou un service d’entretien
qualifiéou par le fournisseur de gaz.
AVERTISSEMENT
Assurez-vousde bien suivre les instructions données
dans cette notice pour réduire au minimum le
risqued’incendie ou d’explosion ou pour éviter tout
dommagematériel, toute blessure ou la mort.
FACTORYPRESETFORUSEWITH
NATURAL GA S
Direct-VentAutomaticInstantaneousWater Heater
(Chauffe-eauautomatiqueinstantanéàventilationdirecte)
FORINDOORINSTALLATIONONLY
(POURINSTALLATIONÀL'INTÉRIEURSEULEMENT)
120Volt,60Hz,5Amps
TypeofGas
(Typedegaz)
:
.. . . . . . . . . . . .. . .
InputRating
(EntrerleClassement)
:Btu/hrMaximum. . .
Btu/hrMinimum. . .
MaximumInletGasPressure:. . . . . . . . . . . .
MinimumInletGasPressure:. .. . . . . . . .. .
MinimumInletGasPressure(foradjustments): ..
MaximumWaterPressure: ..... . . . . . . . .
MinimumWaterPressure: ... . . . . . . . . . .
RecoveryRating: .. . . . . . . . . . . . . . .. .
.. . .. .. . ... . . .. . . .
ThermalEffi
ciency/:
EnergyFactor:
NOxEmissions:
.. . . . . . .
(PursuanttoSouthCoastAirQualityManagementDistrictRule1146.2)
(Moinsde20ppm)
(Jusqu'à98%/0.94) (Jusqu'à98%/0.94)
(Moinsde20ppm)
(Dégagementsminimums)
(Desnon-combustibles) (D'uneconstruction
combustible)
(conformémentaurèglement1146.2 du"South Coast Air Quality Management District)
Topofheater
MinimumClearances
From
Non-Combustibles
FromCombustible
Construction
(Dessusduchauffe-eau)
Backofheater
(Arrièreduchauffe-eau)
Frontofheater
(Avantduchauffe-eau)
Bottomofcabinet
(Côtécanalisation)
Side(Côté)
5/8in(15.8mm)
6in(15.2cm)
6in(15.2cm)
2in(50.8mm)
12in(30.4cm)
5/8in(15.8mm)
6in(15.2cm)
2in(50.8mm)
1/2in(12.7mm)
12in(30.4cm)
IntellihotGreenTechnologiesInc.
2900W.MainSt.
Galesburg,IL61401
Phone:[phone]
Email:[e-mail]
Web:www.intellihot.com
FactoryPreset
NaturalGas
(Réglageenusinepourgaznaturel)
199,000
20,000
13.0W.C.(3.20kPa)
8.0W.C.(2.00kPa)
8.0W.C.(2.00kPa)
150psi(1034kPa)
15psi(103kPa)
265GPH(1003LPH)
Upto98%/0.94
Lessthan20ppm
FieldConversion*to
PropaneGas
(Conversion*surplaceaugazpropane)
199,000
20,000
10.5W.C.(2.62kPa)
3.0W.C.(0.76kPa)
11.0W.C.(2.74kPa)
150psi(1034kPa)
15psi(103kPa)
265GPH(1003LPH)
Upto98%/0.94
Lessthan20ppm
CheckBoxif
Convertedto
PropaneGas
*RefertoInstallationandOperation
manualforconversionprocedure.
(Seréféreraumanueld'installationet
defonctionnementpourlaprocédurede
conversion.)
PRÉRÉGLAGESD'USINEPOURUTILISATIONAVEC
GAZNATUREL
(Pressiondegazd'arrivéemaximum)
(Pressiond'eaumaximum)
(Pressiond'eauminimum)
(Caractéristiquederecouvrement)
(Efficacitéthermique/Facteurénergétique)
(ÉmissionsdeNOx)
(Pressiondegazd'arrivéeminimum)
(Pressiondegazd'arrivéeminimum(pourajustements))
Cocherlacasesiconvertiaugazpropane
ETLSTICKER
SerialNumber:
IGT-LBL-0005-01
(Numérodesérie)
(CollantETL)
Operation and
Installation
Manual
Model: iQ250
This product complies with ANSIZ21.10.3
(2011) /CSA 4.3 Gas Water Heater. For use as
portable water heating.
WARNING
Condensate drain line (2) is shipped from the factory with
a loop held together with plastic ties. Do not remove the
ties and/or straighten the loop. This loop forms an air
block (trap) which prevents carbon monoxide from exiting
the water heater through the drain line. Improper
installation of the drain line can result in excessive levels of
carbon monoxide, which can lead to severe personal injury
or death.
1.2 Contact Information
Call us first if you have any questions about this product. We
can help you with questions about installation or operation,
or if there are damaged or missing parts when you unpack
this unit from the shipping box.
Dealer Contact Information
Due to our policy of continuous product improvement and
technology, the design and/or technical specifications are
subject to change without notice.
Serial Number: ___________________________________
Date of Installation: ___ / ___ / ______
1.3 Serial Number Plate Locations
Each unit’s heat exchanger module has its own ASME
certification plate (1). Rating plate (2) contains serial number
for the unit. Please provide this serial number when calling
for service or warranty.
Rating and safety information inside.
(Caractéristiqueset renseignements de sécurité à l'intérieur)
FACTORY PRESET FOR USE WITH
NATURAL GAS
Direct-Vent Automatic Instantaneous Water Heater
(Chauffe-eauautomatique instantané à ventilation directe)
FOR INDOOR INSTALLATIONONLY
(POURINSTALLATION À L'INTÉRIEUR SEULEMENT)
120 Volt,60 Hz, 5 Amps
Type of Gas
(Typede gaz)
:
. . . . . . . . . . . . . . . .
Input Rating
(Entrerle Classement)
: Btu/hr Maximum . . .
Btu/hr Minimum . . .
Maximum Inlet Gas Pressure: . . . . . . . . . . . .
Minimum Inlet Gas Pressure: . . . . . . . . . . . .
Minimum Inlet Gas Pressure (for adjustments): . .
Maximum Water Pressure: . . . . . . . . . . . . .
Minimum Water Pressure: . . . . . . . . . . . . .
Recovery Rating: . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . .
Thermal Effi
ciency / :
Energy Factor:
NOx Emissions:
. . . . . . . .
(Pursuantto South Coast Air Quality Management District Rule 1146.2)
(Moinsde 20 ppm)
(Jusqu'à98 % / 0.94) (Jusqu'à 98 % / 0.94)
(Moinsde 20 ppm)
(Dégagementsminimums)
(Desnon-combustibles) (D'uneconstruction
combustible)
(conformément au règlement 1146.2 du "South Coast Air Quality Management District)
Topof heater
Minimum Clearances
From
Non-Combustibles
FromCombustible
Construction
(Dessusdu chauffe-eau)
Backof heater
(Arrièredu chauffe-eau)
Frontof heater
(Avantduchauffe-eau)
Bottomof cabinet
(Côtécanalisation)
Side(Côté)
5/8in (15.8 mm)
6in (15.2 cm)
6in (15.2 cm)
2in (50.8 mm)
12in (30.4 cm)
5/8in (15.8 mm)
6in (15.2 cm)
2in (50.8 mm)
1/2in (12.7 mm)
12in (30.4 cm)
Intellihot Green TechnologiesInc.
2900 W. Main St.
Galesburg, IL 61401
Phone: [phone]
Email: [email protected]
Web: www.intellihot.com
Factory Preset
Natural Gas
(Réglageen usine pour gaz naturel)
199,000
20,000
13.0 W.C. (3.20 kPa)
8.0 W.C.(2.00 kPa)
8.0 W.C.(2.00 kPa)
150 psi (1034 kPa)
15 psi (103 kPa)
265 GPH (1003 LPH)
Up to 98% / 0.94
Less than 20 ppm
Field Conversion* to
Propane Gas
(Conversion*sur place au gaz propane)
199,000
20,000
10.5 W.C. (2.62 kPa)
3.0 W.C.(0.76 kPa)
11.0 W.C. (2.74 kPa)
150 psi (1034 kPa)
15 psi (103 kPa)
265 GPH (1003 LPH)
Up to 98% / 0.94
Less than 20 ppm
Check Box if
Convertedto
PropaneGas
*Referto Installation and Operation
manualfor conversion procedure.
(Seréférer au manuel d'installation et
defonctionnement pour la procédure de
conversion.)
PRÉRÉGLAGESD'USINE POUR UTILISATION AVEC
GAZ NATUREL
(Pressionde gaz d'arrivée maximum)
(Pressiond'eau maximum)
(Pressiond'eau minimum)
(Caractéristiquede recouvrement)
(Efficacitéthermique / Facteur énergétique)
(Émissionsde NOx)
(Pressionde gaz d'arrivée minimum)
(Pressionde gaz d'arrivée minimum (pour ajustements))
Cocherla case si converti au gaz propane
ETL STICKER
Serial Number:
IGT-LBL-0005-01
(Numérode série)
(CollantETL)

5 Safety Section
2. Safety
2.1 Safety Signal Words
DANGER
Indicates an imminently hazardous situation which, if not
avoided, will result in death or serious injury. This signal
word is limited to the most extreme situations.
WARNING
Indicates a potentially hazardous situation which, if not
avoided, could result in death or serious injury.
CAUTION
Indicates a potentially hazardous situation which, if not
avoided, may result in minor or moderate injury.
NOTICE
Indicates that equipment or property damage can result if
instructions are not followed.
SAFETY
INSTRUCTIONS
Safety instructions (or equivalent) signs indicate specific
safety-related instructions or procedures.
Note: Contains additional information important to a
procedure.
2.2 Installation Warnings
WARNING
DO NOT use this water heater for any purpose other than
water heating.
Read, understand, and follow the Installation and Operation
manuals, including all warnings and precautions, before
operating this water heater. If you do not follow these
instructions exactly, a fire or explosion may result, causing
property damage, personal injury, or loss of life.
Follow all local codes and the most recent edition of the
National Fuel Gas Code (ANSI Z223.1/NFPA 54) in the USA or
the Natural Gas and Propane Installation Code in Canada
(CSA B149.1).
This water heater must be installed by a licensed plumber,
gas fitter, and/or professional service technician. Installation
by unqualified person(s) voids the warranty.
DANGER
A. This water heater does not have a pilot. It is equipped
with an ignition device which automatically lights the
burner. Do not try to light the burner manually.
B. BEFORE OPERATING, smell all around the water heater
area for gas. Be sure to smell next to the floor because
some gas is heavier than air and will settle on the floor.
WHAT TO DO IF YOU SMELL GAS:
• Do not try to light any appliance.
• Do not touch any electric switch; do not use any phone in
your building.
• Immediately call your gas supplier from a neighbor’s
phone. Follow the gas supplier’s instructions.
• If you cannot reach your gas supplier, call the fire or
police department.
C. Use only your hand to turn the manual gas shut-off
valve. Never use tools. If manual gas shut-off valve will
not turn by hand, don’t try to repair it. Call a qualified
service technician. Force or attempted repair may
result in a fire or explosion.
WARNING
DO NOT use or store flammable liquids around the water
heater, including gasoline, oils, spray paints, etc.
DO NOT operate this water heater unless it is properly
vented to the outside (the exhaust vent piping must be
connected from the unit directly to the outside). Improper
venting can cause a build-up of carbon monoxide, which
can result in brain damage or death. Exhaust gases must
be completely expelled out of the building.
This water heater is factory preset for NATURAL GAS but
may be field converted for use with propane. For propane
conversion, refer to the Propane (LPG) Conversion section
of this manual. Connecting the water heater to any other
gas supply can result in property damage, serious injury,
or even death.
This water heater is suitable for use in potable water
heating applications. The cold and hot water fittings on
the top of the water heater MUST NOT be connected to any
heating system.
The water heater temperature is factory set to 120°F
(49°C). Hot water temperatures above 125°F can cause
severe burns instantly or death from scalds. If the
proposed water heater outlet temperature is to be set
above 125°F, installation of a thermostatically controlled
(or temperature limiting) mixing valve is recommended for
all hot water going to faucets to avoid the risk of scalding.
Examples include commercial applications where 140°F
(60°C) is often needed or if the space heating temperature
required is higher than the domestic hot water. Always
check the temperature of the hot water before bathing,
showering, washing, etc.
Protect against snow and debris accumulation around the
vent terminations. Regularly inspect the exhaust vent
pipe and the air intake pipe to ensure they remain clear
from obstructions at all times.

Safety Section 6
CAUTION
Make sure you know the location of the gas shut-off valve
and how to operate it. Immediately close the gas shut-off
valve if the water heater is subjected to fire, overheating,
flood, physical damage, or any other damaging condition
that might affect the operation of the unit. Have the water
heater checked by a qualified technician before resuming
operation.
If the water quality is known to have high acidity and/or
high hardness, water treatment is recommended. Consult
the local water authority.
SAFETY
INSTRUCTIONS
DO NOT use this appliance if any part has been under
water.
DO NOT reverse the cold water and gas connections as this
will damage the gas valve.
DO NOT overtighten fittings as damage may occur, causing
internal leakage.
The appliance should be located in an area where leakage
within the unit or at its connections will not result in
damage to the surrounding area. The manufacturer will
not be responsible for any damage resulting from leaking
if adequate drainage is not provided.

7
3. Technical Data
3.1 Specifications Chart
Technical Data iQ250D
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Safety
Flame Rod, Thermal Fuse, Overheat Prevention Device, Fan Speed Monitor,
Flue Temperature Monitor, Blocked Vent Detector, Water Shut-Off Valve,
2X10A Fuse, Dual Flame Sensing, Flue Damper
061/03)ISP(xaM/niMerusserPretaW
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Features iQ25
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Performance iQ25
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Commercial Warranty Heat Exchanger Coil - 6 years, Parts – 1 year
Note: Due to continuous product improvements, the design and technical specifications are subject to change without notice
3.2 High Elevation Installations
For operation at elevations above 2,000 feet, the hot water
delivery capacity should be reduced by 4% for each 1,000 feet
above sea level.

8
3.3 Dimensional Specifications
17
3
8
"
26"
1
5
8
"
FRONT VIEW
BOTTOM MOUNTING
BRACKET
9
16
"
14
7
8
"
14
5
16
"
2
15
16
"
4
5
8
"
7
13
16
"
2
15
16
"
6
5
8
"
SIDE VIEW
POWER CORD
CONDENSATE DRAIN
2
3
4
"
2
7
16
"
8
7
8
"
13
1
2
"
14
7
16
"
2
15
16
"
4
5
8
"
7
13
16
"
TOP VIEW
HOT WATER OUT
COLD WATER IN
FRESH AIR INTAKE 3"
EXHAUST PORT 3"
GAS INLET
3/4 NPT
2
3
8
"
6
1
16
"
2
15
16
"
1"
BOTTOM VIEW
POWER CORD
CONDENSATE DRAIN
MOUNTING WALL SURFACE
3/4 NPT (STAINLESS)
3/4 NPT (STAINLESS)

9
3.4 Connections
Item Description Specification1
1 Hot Water Outlet Connection 3/4” Male NPT
2 Exhaust Gas Vent 3” O.D.
3 Gas Supply Inlet Connection 3/4” Male NPT
4 Gas Pressure Analyzer Port 1/8” Female NPT
5 Fresh Air Intake 3” O.D.
6 Access Ports for Blower Mounting
Screws
—
7 Hot Water Supply Inlet Connection 3/4” Male NPT
8 Power Supply —
9 Condensate Drain Connection 3/4” Nipple (3/4” flex hose)
1Using sizes other than specied can cause damage to the water
heater and will void the warranty.
IQ-012a
2
5
7
3
4
1
6
IQ-009a
9
8
120 Volt
120 Volt
Minimum 10 Amp
Circuit Breaker
Required
Condensate
Drain

Installation Preparation 10
4. Preparation Before Installation
4.1 Selecting an Installation Site
Note: When installing the water heater, follow all local
building codes and the current edition of the National
Fuel Gas Code (ANSI Z223.1/NFPA 54) in the USA, or
National Gas and Propane Installation Code (CAN/CGA
B149.1) in Canada when installing this product.
Note: For water heater installations in Massachusetts, the
unit must be installed by a plumber or gas-fitter
licensed within the Commonwealth of Massachusetts.
Refer to the Requirements for the State of
Massachusetts section in this manual for additional
information.
1. Select an interior location for the installation. Each
installation is unique; therefore, take the time to find the
best location for the water heater.
a. Install the water heater near locations that use hot
water, such as bathroom, kitchen, or laundry room
faucets.
b. Select a location that minimizes the length of the water
pipe.
c. If the distances are long or if the faucet or appliance
requires “instant” hot water, we recommend running
a recirculation line back to the water heater from the
farthest fixture.
d. Insulate the hot water supply and recirculation lines.
e. Select a location away from foot traffic and away from
areas where dust, debris, chemical agents, or other
combustible materials could accumulate.
f. Allow sufficient space for service and maintenance
access to all gas, water, and drain connections.
g. Make sure the location meets all building code
requirements.
h. Make sure the wall surface that the water heater is
mounted on will support the weight of the unit
(90 lbs. minimum).
2. Minimize the distance that the exhaust gas vent and fresh
air intake must travel to an exterior wall.
a. The exhaust vent outlet must not be located next
to a walkway, near soffit vents, crawl space vents,
or other areas where condensate (water vapor)
could cause damage or create a hazard. Refer to the
Venting Clearance Specications section for additional
information.
b. The fresh air inlet vent must be located at least 12”
from the exhaust vent.
c. Contaminated or dirty air drawn into the intake pipe
can damage the water heater. The warranty does not
cover damage caused by airborne contaminants.
3. Locate the unit close to a drain and near gas and water
connections.
The water heater produces a significant amount of
condensate during normal operation and should be
located near a suitable drain where damage from a
possible leak will be minimal. Installing the water heater
in a location without a drain will void the warranty
and the manufacturer will not be responsible for any
resulting water damages that may occur. For additional
information, refer to the Condensate Line Installation
section.
4. Locate the water heater and all the water pipes in an area
where the ambient temperature always remains above
freezing.
a. When the water heater is connected to an electrical
power supply, it will automatically prevent the water
from freezing inside the unit.
b. The unit’s freeze protection system will not prevent the
water in surrounding pipes from freezing.
NOTICE
In cold climates, if there is a power failure, the unit’s freeze
protection system will not operate and can result in water freezing
inside the heat exchanger. To prevent damage to the water
heater, turn OFF the gas supply and inlet water valve. Completely
drain the unit. Damage caused by freezing water is not covered
by the warranty.
5. Select an appropriate location for the combustion air and
exhaust pipes to exit the building, as shown in the Venting
Clearance Specications section in this manual.

11
5. Wall Mounting
5.1 Clearance Requirements
In order for the water heater to operate properly and efficiently,
the clearances specified in the table are required.
IQ-043
Side
Side
Back
Top
Bottom
Front
Required Mounting Clearances
Location From
Combustibles
From Non-
Combustibles
Service
Clearance1
Top 6” (15.2 cm) 2” (50.8 cm) 12” (30.4 cm)
Back25/8” (15.8 mm) 5/8” (15.8 mm) 5/8” (15.8 mm)
Sides 1” (25.4 mm) 1/2” (12.7 mm) 5/8” (15.8 mm)
Front 2” (5.1 cm) 2” (5.1 cm) 30” (76.2 cm)
Bottom 12” (30.4 cm) 12” (30.4 cm) 12” (30.4 cm)
1Service clearances are suggested to allow for normal service.
2Mounting bracket automatically sets this dimension.
5.2 Mounting the Unit to the Wall
All water heaters come with an upper mounting bracket with
predrilled holes spaced on 16 inch centers to facilitate easy
installation on standard wall studs.
If the strength of the wall is insufficient or if the framing is
non-standard or uneven, reinforce the area using a sheet of
plywood before installing the water heater.
Avoid installation on inside walls that can transmit
operational noises to occupants while the unit is operating.
To mount the water heater to the wall:
1. Place the upper mounting bracket on the wall and ensure
that it is level. Use two appropriately sized wood screws
to mount the bracket securely to the studs. Ensure that
it is affixed securely and can support the weight of the 90
pound unit.
STUDS
IQ-094
2
1
iQ-042
3
120 Volt
120 Volt
Minimum 10 Amp
Circuit Breaker
Required
Condensate
Drain
SAFETY
INSTRUCTIONS
Only brackets are included and should be used to mount
the unit. Water heaters weigh approximately 100 lbs., and
must be securely attached to the wall.
CAUTION
According to the National Institute for Occupational Safety
and Health, the recommended maximum safe lifting
weight is 51 lbs., with all lifting conditions perfect; minimal
forward reach, steady load close to the body, straight
back, load between knees and shoulders, and good grips.
To avoid personal injury, always use these proper lifting
techniques and use two people to move the water heater
which weighs 80 lbs.
2. With assistance, hang the unit on the upper wall bracket,
interlocking bracket (1) on the back of the unit, and wall
bracket (2).
3. Install two appropriately sized wood screws in lower
bracket (3) to secure the unit to the wall.
4. Make sure the unit is plumb and level, and tighten the four
sheet metal screws on bottom bracket (3). When properly
installed, there should be a 5/8” air space between the
back of the water heater and the wall.

12
6. Gas Connections
6.1 Installation Guidelines
WARNING
To avoid serious injury or even death, the gas line
installation and the gas line inlet pressure test
must be done by a licensed professional.
The water heater is factory preset for natural gas.
Make sure the gas line pressures are within normal
limits. Pressures outside normal limits can result in poor
performance and hazardous operating conditions.
1. Determine if the unit will use natural gas (factory preset)
or LP (propane) gas. To convert the unit to propane, refer
to the Propane (LPG) Conversion section in this manual.
2. Ensure the gas supply pressure meets the requirements
for the unit, as shown below.
NG / LP
Parameters
Inches of
Water Column
Minimum Static Gas Pressure 1/2” (black iron pipe) 6”
Minimum Static Gas Pressure 3/4” (black iron pipe) 2.5”
Maximum Static Gas Pressure 14”
Gas Pressure for Adjustments 8” for NG, 11” for LP
3. Select the proper gas piping.
a. All gas piping and components must comply with
NFPA local codes and utility requirements. Only gas
approved fittings, valves, or pipes should be utilized.
b. Assembled piping should be clean of all scale, debris,
metal particles, or foreign material.
c. The piping must be supported by the floor, ceiling, or
walls.
4. Make sure the pipe diameter for the length being used
is correctly sized to meet maximum output of the water
heater(s) being installed.
a. The maximum gas flow rate required is the sum of the
maximum inputs of each unit divided by the heat of
combustion of the fuel supplied at the location (use
1,030 BTU per cubic foot for natural gas and 2,520 BTU
per cubic foot for propane).
b. The fuel supplier or utility company should be
consulted to confirm that sufficient volume and normal
pressure is provided to the building at the discharge
side of the gas meter or supply pipe.
c. Use the Gas Pipe Sizing tables in this manual or refer
to the gas line manufacturer’s sizing information to
determine the correct diameter for the supply pipe.
5. Make sure a drip leg is installed on the gas piping.
a. Drip legs are required at the gas supply of each water
heater to prevent any dirt, condensation, or debris
from entering the gas inlet.
b. When multiple heaters are installed, some utilities and
local codes require a full size drip leg on the main gas
supply line in addition to the drip leg for each unit.
c. The bottom of the gas drip leg should be removable
without disassembling any gas piping.
d. The gas pipe should not be supported by the bottom
of the drip leg.
iQ-014
Note: Always clean the inside of the gas line of any dirt or
debris before connecting the piping to the unit.
NOTICE
Do not start the water heater until all connections have been
completed, leak-tested, and the heat exchanger is filled with
water.
6.2 Excess Flow Valve (EFV)
If an excess flow valve (EFV) is installed in the gas line, check
the manufacturer’s minimum and maximum flow capacity
rating. An improperly sized EFV will not allow for the full
flow of gas to the water heater and will cause the unit to
malfunction.

13
6.3 Gas Pipe Sizing Tables
This information is for reference only. Refer to gas pipe
manufacturer specifications for actual delivery capacity.
Contact the local gas supplier for actual BTU/ft3rating. This
data copied from the National Fire Protection Association
Article 54 (NFPA 54).
Pipe Sizes and BTU/h Capacity (Natural Gas). Use this table for static gas pressure less than 5”
Length
Including
fittings
3⁄4" 1" 1-1/4" 1-1/2" 2" 2-1/2" 3" 4"
10 360,000 678,000 1,390,000 2,090,000 4,020,000 6,400,000 11,300,000 23,100,000
20 247,000 466,000 957,000 1,430,000 2,760,000 4,400,000 7,780,000 15,900,000
30 199,000 374,000 768,000 1,150,000 2,220,000 3,530,000 6,250,000 12,700,000
40 - 320,000 657,000 985,000 1,900,000 3,020,000 5,350,000 10,900,000
50 - 284,000 583,000 873,000 1,680,000 2,680,000 4,740,000 9,660,000
60 - 257,000 528,000 791,000 1,520,000 2,430,000 4,290,000 8,760,000
70 - 237,000 486,000 728,000 1,400,000 2,230,000 3,950,000 8,050,000
80 - 220,000 452,000 677,000 1,300,000 2,080,000 3,670,000 7,490,000
90 - 207,000 424,000 635,000 1,220,000 1,950,000 3,450,000 7,030,000
100 - - 400,000 600,000 1,160,000 1,840,000 3,260,000 6,640,000
125 - - 355,000 532,000 1,020,000 1,630,000 2,890,000 5,890,000
150 - - 322,000 482,000 928,000 1,480,000 2,610,000 5,330,000
175 - - 296,000 443,000 854,000 1,360,000 2,410,000 4,910,000
200 - - 275,000 412,000 794,000 1,270,000 2,240,000 4,560,000
Note: BTU/h capacities are based on specific gravity of 0.6, pressure drop of 0.5” WC
Pipe Sizes and BTU/h Capacity (Natural Gas). Use this table for static gas pressure greater than 5”
Length
Including
fittings
1/2" 3⁄4" 1" 1-1/4" 1-1/2" 2" 2-1/2" 3" 4"
10 404,000 949,000 1,787,000 3,669,000 5,497,000 10,588,000 16,875,000 29,832,000 43,678,000
20 286,000 652,000 1,228,000 2,522,000 3,778,000 7,277,000 11,598,000 20,503,000 30,020,000
30 233,000 524,000 986,000 2,025,000 3,034,000 5,844,000 9,314,000 16,465,000 24,107,000
40 202,000 448,000 844,000 1,733,000 2,597,000 5,001,000 7,971,000 14,092,000 20,632,000
50 - 397,000 748,000 1,536,000 2,302,000 4,433,000 7,065,000 12,489,000 18,286,000
60 - 360,000 678,000 1,392,000 2,085,000 4,016,000 6,401,000 11,316,000 16,569,000
70 - 331,000 624,000 1,280,000 1,919,000 3,695,000 5,889,000 10,411,000 15,243,000
80 - 308,000 580,000 1,191,000 1,785,000 3,437,000 5,479,000 9,685,000 14,181,000
90 - 289,000 544,000 1,118,000 1,675,000 3,225,000 5,140,000 9,087,000 13,305,000
100 - 273,000 514,000 1,056,000 1,582,000 3,046,000 4,856,000 8,584,000 12,568,000
125 - 242,000 456,000 936,000 1,402,000 2,700,000 4,303,000 7,608,000 11,139,000
150 - 219,000 413,000 848,000 1,270,000 2,446,000 3,899,000 6,893,000 10,093,000
175 - 202,000 380,000 780,000 1,169,000 2,251,000 3,587,000 6,342,000 9,285,000
200 - - 353,000 726,000 1,087,000 2,094,000 3,337,000 5,900,000 8,638,000
Note: For 1/2” line BTU/h capacities are based on specific gravity of 0.6, pressure drop of 4.6” WC and 5.0” WC. For all other line sizes, capacities are based on
specific gravity of 0.6, pressure drop of 3.0” WC

14
Pipe sizes and BTU/h capacity (Propane). Use this table for static gas pressure greater than 5”
Length
Including
fittings
1/2" 3⁄4" 1" 1-1/4" 1-1/2" 2" 2-1/2" 3" 4"
10 409,000 608,000 1,150,000 2,350,000 3,520,000 6,790,000 10,800,000 19,100,000 39,000,000
20 289,000 418,000 787,000 1,620,000 2,420,000 4,660,000 7,430,000 13,100,000 26,800,000
30 236,000 336,000 632,000 1,300,000 1,940,000 3,750,000 5,970,000 10,600,000 21,500,000
40 204,000 287,000 541,000 1,110,000 1,660,000 3,210,000 5,110,000 9,030,000 18,400,000
50 - 255,000 480,000 985,000 1,480,000 2,840,000 4,530,000 8,000,000 16,300,000
60 - 231,000 434,000 892,000 1,340,000 2,570,000 4,100,000 7,250,000 14,800,000
80 - 212,000 400,000 821,000 1,230,000 2,370,000 3,770,000 6,670,000 13,600,000
100 - - 372,000 763,000 1,140,000 2,200,000 3,510,000 6,210,000 12,700,000
125 - - 349,000 716,000 1,070,000 2,070,000 3,290,000 5,820,000 11,900,000
150 - - 330,000 677,000 1,010,000 1,950,000 3,110,000 5,500,000 11,200,000
175 - - 292,000 600,000 899,000 1,730,000 2,760,000 4,880,000 9,950,000
200 - - 265,000 543,000 814,000 1,570,000 2,500,000 4,420,000 9,010,000
Note: The line BTU/h capacities are based on specific gravity of 1.5, pressure drop of 0.5” WC.
6.4 Gas Pressure Regulator
Depending on the gas inlet pressure at your location, it
may be necessary to install a gas pressure regulator to
lower gas pressures to an acceptable level. Please ensure
that the gas pressure regulator has the same or higher
minimum to maximum modulation range as the water heater
model it is connected to. In the case of multiple units, it is
recommended to use a dedicated gas pressure regulator for
each unit.
Regulators should be mounted with a minimum of 12” of
straight length pipe on either side.
6.5 Venting of Gas Supply Regulators
Below are the general guidelines for venting a gas regulator.
The manufacturer recommends these guidelines be followed
to ensure reliable and proper operation of the water heater.
Local codes and the gas regulator manufacturer should also
be consulted for additional installation information.
1. When venting the gas supply regulator, the vent pipe
must be at least the same size as the regulator vent.
2. When multiple units are connected, each regulator must
have a separate vent line.
3. Vent lines must not be connected together or connected
with any other appliance requiring external venting.
4. When selecting the size, the pipe diameter must be
increased by one size for every 20 feet of pipe.
5. Each 90° elbow is equivalent to approximately:
4.5 feet for nominal pipe sizes of up to 1-1/2”
10.5 feet for nominal pipe sizes of up to 4”
6. Each 45° elbow is equivalent to approximately:
2 feet for nominal pipe sizes of up to 1-1/2”
5 feet for nominal pipe sizes of up to 4”

15
7. Venting and Materials
WARNING
Improper venting of the water heater can result in excessive
levels of carbon monoxide, which can lead to severe
personal injury or death. This water heater must be vented
in accordance with the “Venting of Equipment “section of
the latest edition of the ANSI Z223.1 / NFPA 54 (Natural
Fuel Gas Code) in the USA, or in Canada refer to the
“Venting Systems and Air Supply for Appliances” section
in the latest version of CAN/CGA B149.1 (Natural Gas and
Propane Installation Code), and all applicable local
building codes. Vent installation should be performed
only by a licensed professional.
7.1 Venting Guidelines
• This water heater must be properly vented to ensure
there is a constant supply of clean intake air, and the
exhaust is properly evacuated from the building. All seal
connections should be airtight.
• The unit should be located as close to the vent
termination, and the vents kept as short and straight as
possible.
• Do not connect the water heater vent to a vent of any
other non-water heater appliance.
• Combustion air may be drawn from the room where the
unit is installed (single pipe/power vent) or directly from
the outside (two pipe/direct vent).
• Ensure a sufficient supply of clean combustion air, free
of any contaminants, such as dust, chemical fumes
(i.e. aerosols, chlorine, paint), grass, or other airborne
contaminants. If necessary, purchase and install the
appropriate air screens, and follow a regular cleaning
program to ensure an adequate supply of clean
combustion air.
• Do not operate the unit in an area that is or will be under
construction or renovation.
• The warranty does not cover damage caused by
contaminants in the installation area. If you must install
the water heater in an area with contaminated air, use
direct venting to supply the air from the outside of the
building.
• All horizontal runs should be sloped upwards towards
the vent termination at a rate of 1/4” per foot.
• To avoid moisture and frost build-up to openings on
adjacent homes, use 45° elbows, 90° elbows, or tees for
the vent termination to direct the exhaust fumes away
from the building.
7.2 Exhaust Vent Materials
The materials listed in the table below outline the acceptable
exhaust vent materials:
United States Exhaust Vent Pipe Standards
Material Description*
Exhaust
Vent Pipe
PVC Schedule 40
CPVC Schedule 40, 80
Approved Polypropylene
AL294C Stainless Steel
Canadian Exhaust Vent Pipe Standards
Material Description (approved to ULC-S636)**
Exhaust
Vent Pipe
Type BH Special Gas Vent Class IIA (PVC)
Type BH Special Gas Vent Class IIB (CPVC)
Type BH Special Gas Vent Class IIC (Polypropylene)
Type BH Special Gas Vent Class I
(AL294C Stainless Steel)
*Note: Do not use cellular foam core pipe for the exhaust.
**Note: The components (pipe, fittings, primers, and glues) must be from a
single manufacturer; do not interchange. Follow the vent manufacturer’s
certified instructions.
This water heater has a built-in exhaust vent temperature
control that limits the exhaust temperature to a maximum of
149°F (65°C).
If the temperature approaches the upper limit, the burner
will turn off automatically to protect the vent pipe. As a
result, this water heater can be vented with PVC pipe. Once
the exhaust temperature has dropped to a normal operating
level, the unit will automatically restart.
If the inlet/return water temperature will exceed 150°F
(66°C), do not use PVC venting. Refer to the Programming
section for Flue Type Selection (PVC or CPVC) for additional
information.
7.3 Air Intake Vent Materials
The air intake vent can be of any plastic or metal vent
material available. ABS, PVC, Polypropylene, galvanized steel,
and flexible corrugated ducting are all examples. If you are
using a corrugated material, ensure there is no inadvertent
crimping or blockage to the air intake pipe.

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7.4 Venting Configurations
Water heaters may be installed with:
two pipes (direct vent) configuration or with
one pipe (power vent) configuration.
7.5 Two Pipe Vent System (Direct Vent)
The water heater can be direct vented without any
modification using a 3 inch diameter pipe.
The following diagrams represent some typical direct venting
configurations and are included to assist in designing the
vent system. Possible configurations are not limited to the
following diagrams.
Intake
Air
Exhaust
Intake
Air
Exhaust
Intake
Air
Exhaust

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7.5.1 Single Pipe Venting System (Power Vent)
When using the single exhaust pipe/power vent method, the
following table outlines the required opening sizes for the
combustion and ventilation air coming into the room:
Required Combustion & Ventilation Air Opening Sizes (sq. in) Per Heater Per Room:
Input
BTU/hr Air Type
Air is drawn directly from outside into the room Example #4
Air is drawn from
another interior space
inside the building
Example #1
through two openings*,
direct or vertical
Example #2
through one opening**
Example #3
through two horizontal
ducts***
199,950 Combustion Air 50 67 100 67
Ventilation Air 50 100 67
250,000 Combustion Air 63 84 125 84
Ventilation Air 63 125 84
*Where two openings are used, one must be within 12” of the oor and the other opening must be within 12” of the ceiling.
**Where one opening is required, it must be located within 12” of the ceiling. See illustration below.
Combustion Air Direct from Outside
2 Direct Openings or through Vertical Duct
1 sq. in. per 4000 btu/h
Combustion Air Direct from Outside
1 Direct Opening
1 sq. in. per 3000 btu/h
Intake Air
Intake Air
Combustion Air Through Ducts
2 Openings through Horizontal Duct
1 sq. in. per 2000 btu/h
Combustion Air from Interior Space
2 Direct Openings or through Vertical Duct
1 sq. in. per 1000 btu/h
Intake Air
Intake Air
Intake Air
Intake Air
Intake Air
Exhaust Exhaust
Exhaust
Exhaust
#1 #2
#3 #4

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The following illustrations represent some typical power
venting configurations and are included to assist in designing
the vent system. Possible configurations are not limited to
these designs.
Intake
Air
Intake
Air
Intake Air
Intake Air
Exhaust
Exhaust
Exhaust

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7.6 Venting Termination
7.6.1 Side Wall Termination
1. Terminate the air intake with a 90° elbow (angled down).
Use a flange and PVC screen (not supplied).
2. Terminate the exhaust on the exterior wall at least 12”
above ground and at least 12” away from the air intake, or
as required by local building codes. In areas of high snow
fall, protect the vent terminations from blockage. Use a
flange and PVC guard.
IQ-020
Intake Air
Exhaust
12”
Single unit.
IQ-020a
Exhaust
Intake Air
See
Note A
Multiple units.
Note A: The distance between any exhaust outlet and air
intake should be between 18 and 36 inches or
greater than 72 inches.
7.6.2 Roof Termination
Venting the unit through the roof is also an option. With this
installation method, the terminations must extend at least 12”
over maximum potential snow levels, or as required by local
building codes. In areas of high snow fall, protect the vent
terminations from blockage.
Terminate the air intake with a 90° elbow (angled down). A
suitable roof flashing and vent cap (not supplied) should be
installed.
IQ-021
12” USA or
18” Canada
over maximum
snow level or
as required by
local code
12” Minimum
3’ Minimum
12” USA or
18” Canada
over maximum
snow level or as
required by local
code
Exhaust Intake Air
Single unit.
IQ-021a
Intake Air
Exhaust
See
Note A
Multiple units.
Note A: The distance between any exhaust outlet and air
intake should be between 18 and 36 inches or
greater than 72 inches.

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7.6.3 Concentric Venting Termination (Single Unit)
If desired, an optional concentric venting system, which uses
one 5” opening through an exterior wall or roof, can be used,
as opposed to cutting two 3” openings.
Follow all installation instructions included with the
concentric vent kit when installing this type of vent system.
IQ-022
Exhaust
Exhaust
Intake Air
Intake
Air
12” above
Highest
anticipated
snow level
or grade.
1”
Concentric Venting System Through a Side Wall.
IQ-023 Intake Air
Intake Air
Exhaust
Exhaust
12” USA or 18” Canada
Over maximum snow
level or as required by
local code
Concentric Venting System Through the Roof.
7.6.4 Concentric Venting Termination (Multiple
Units
In order to conform to some national codes, when two or
more water heaters are installed they must be individually
vented. When two or more units are vented near each other,
each vent termination must be installed, as shown, to avoid
recirculation of flue gases. A minimum distance of 18 inches
must be maintained between each vent termination.
Follow all installation instructions included with the
concentric vent kit when installing this type of vent system.
1” MAXIMUM (TYP)
VENT
VENT
VENT
COMBUSTION AIR
12” MINUMUM
12” MINUMUM
TO MAXIMUM
TO MAXIMUM
EXPECTED
EXPECTED
SNOW LEVEL
SNOW LEVEL
12” MINUMUM
TO MAXIMUM
EXPECTED
SNOW LEVEL
IQ-083
See
Note A
Multiple concentric units.
Note A: The distance between any exhaust outlet and air
intake should be between 18 and 36 inches or
greater than 72 inches.