A.O. Smith R2VR-180E Signature 240-Volt 18-kW 1.6-GPM Tankless Electric Water Heater Use & care guide 36 Pages
A.O. Smith R2VR-180E Signature 240-Volt 18-kW 1.6-GPM Tankless Electric Water Heater Use & care guide
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A.O. Smith R2VR-180E is an electric tankless water heater that provides an endless supply of hot water without waiting. It is designed for residential use and can be installed indoors or outdoors. The R2VR-180E has a compact design and is easy to install. It is also energy-efficient and can save you money on your energy bills. With a flow rate of 1.8 gallons per minute, it is ideal for homes with up to 2 bathrooms.
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Electric Tankless
Water Heater
Keep this manual near the water heater for future reference whenever maintenance, adjustment or service is required.
Retain your original receipt as proof of purchase.
IMPORTANT SAFETY INFORMATION ............................. 2
GENERAL INFORMATION ............................................... 5
INSTALLATION ............................................................... 11
OPERATION ................................................................... 15
TROUBLESHOOTING .................................................... 17
SERVICE ......................................................................... 22
WIRING DIAGRAMS ..................................................... 29
APPENDIX ...................................................................... 34
Table of Contents ..............................Page
°F
°C
ENTER
°F
°C
ENTER
PLEASE DO NOT RETURN THIS UNIT TO THE
STORE.
Read this manual and the labels on the water heater before you install,
operate, or service it. If you have difficulty following the direcƟons, or
aren’t sure you can safely and properly do any of this work yourself:
• Call our Technical Support Hotline:
United States: 1-877-817-6750
Canada: 1-800-265-8520
We can help you with installation, operations, troubleshooting, or
maintenance. Before you call, write down the model and serial number from
the water heater’s data plate.
• Incorrect installaƟon, operaƟon, or service can damage the water heater, your
house and other property, and present risks including fire, scalding, electric
shock, and explosion, causing serious injury or death.
0618
100306524_2000558984 (REV. A)
InstallaƟon InstrucƟons
and Use & Care Guide
Water Heater
Keep this manual near the water heater for future reference whenever maintenance, adjustment or service is required.
Retain your original receipt as proof of purchase.
IMPORTANT SAFETY INFORMATION ............................. 2
GENERAL INFORMATION ............................................... 5
INSTALLATION ............................................................... 11
OPERATION ................................................................... 15
TROUBLESHOOTING .................................................... 17
SERVICE ......................................................................... 22
WIRING DIAGRAMS ..................................................... 29
APPENDIX ...................................................................... 34
Table of Contents ..............................Page
°F
°C
ENTER
°F
°C
ENTER
PLEASE DO NOT RETURN THIS UNIT TO THE
STORE.
Read this manual and the labels on the water heater before you install,
operate, or service it. If you have difficulty following the direcƟons, or
aren’t sure you can safely and properly do any of this work yourself:
• Call our Technical Support Hotline:
United States: 1-877-817-6750
Canada: 1-800-265-8520
We can help you with installation, operations, troubleshooting, or
maintenance. Before you call, write down the model and serial number from
the water heater’s data plate.
• Incorrect installaƟon, operaƟon, or service can damage the water heater, your
house and other property, and present risks including fire, scalding, electric
shock, and explosion, causing serious injury or death.
0618
100306524_2000558984 (REV. A)
InstallaƟon InstrucƟons
and Use & Care Guide
SAFETY
2 • Electric Tankless Water Heater
IMPORTANT SAFETY INFORMATION
Important informaƟon to keep...
Fill out this secƟon and keep this
manual for reference.
Date Purchased:
Model number:
Serial number:
Maintenance performed: Date:
This is the safety alert symbol. It is used to alert you to
potenƟal physical injury hazards. Obey all safety mes-
sages that follow this symbol to avoid possible property
damage, serious injury or death. Do not remove any
permanent instrucƟons, labels, or the data plate from either the outside of
the water heater or on the inside of the access panels. Keep this manual
near the water heater.
DANGER
Read and follow all safety messages and instrucƟons in
this manual.
DANGER indicates hazardous
situaƟon that, if not avoided, will
result in death or serious injury.
WARNING WARNING indicates a hazardous
situaƟon that, if not avoided, could
result in death or serious injury.
CAUTION CAUTION indicates a hazardous
situaƟon that, if not avoided, could
result in minor or moderate injury.
NOTICE NOTICE indicates pracƟces not
related to physical injury.
2 • Electric Tankless Water Heater
IMPORTANT SAFETY INFORMATION
Important informaƟon to keep...
Fill out this secƟon and keep this
manual for reference.
Date Purchased:
Model number:
Serial number:
Maintenance performed: Date:
This is the safety alert symbol. It is used to alert you to
potenƟal physical injury hazards. Obey all safety mes-
sages that follow this symbol to avoid possible property
damage, serious injury or death. Do not remove any
permanent instrucƟons, labels, or the data plate from either the outside of
the water heater or on the inside of the access panels. Keep this manual
near the water heater.
DANGER
Read and follow all safety messages and instrucƟons in
this manual.
DANGER indicates hazardous
situaƟon that, if not avoided, will
result in death or serious injury.
WARNING WARNING indicates a hazardous
situaƟon that, if not avoided, could
result in death or serious injury.
CAUTION CAUTION indicates a hazardous
situaƟon that, if not avoided, could
result in minor or moderate injury.
NOTICE NOTICE indicates pracƟces not
related to physical injury.
SAFETY
Electric Tankless Water Heater • 3
To reduce the risk of property
damage, serious injury or death,
read and follow the precauƟons below,
all labels on the water heater, and
the safety messages and instrucƟons
throughout this manual.
General Requirements
• Install and properly ground the
unit in accordance with local
codes, or in the absence of local
codes, with the current edition
of the National Electrical Code:
ANSI/NFPA 70 in the USA or
CSA standard C22.1 Canadian
Electrical Code, Part 1 in Canada.
• Follow all applicable plumbing,
heating, and air conditioning
codes during installation.
RISKS DURING INSTALLATION
AND MAINTENANCE
WARNING
Electric Shock Risk
Contact with the electrical
parts inside the water heater
can result in severe injury or
death from electrical shock:
• Disconnect power by opening the
circuit breaker(s) before installing
or servicing.
• SOME MODELS ARE CONNECTED
TO MORE THAN ONE BRANCH
CIRCUIT, AND MORE THAN ONE
DISCONNECT SWITCH MAY BE
REQUIRED TO DEͳENERGIZE THE
EQUIPMENT. ALL BRANCH CIRͳ
CUITS MUST BE DISCONNECTED
PRIOR TO SERVICE.
• Use a non-contact circuit tester to
confirm that power is off before work-
ing on or near any electrical parts.
• Be sure the cover is reinstalled and
secured after servicing to reduce
the risk of fire and electric shock.
RISKS DURING OPERATION
WARNING
Scalding Risk
This water heater
can make water hot
enough to cause
severe burns instantly, resulting in
severe injury or death.
• Feel water before bathing or
showering.
• To reduce the risk of scalding,
install Thermostatic Mixing
Valves (temperature limiting
valves) at each point of use.
These valves automatically mix
hot and cold water to limit the
temperature at the tap. Mixing
valves are available at your local
hardware store or from your
plumbing supplier. Follow the
manufacturer’s instructions for
installation and adjustment of the
valves.
• For all models, the temperature
set point is factory set to 120°F
to reduce the risk of scalding.
Exception: single chamber (point-
of-use) models are factory set to
approximately 105°F.
• Higher temperatures increase
the risk of scalding, but even at
120°F, hot water can scald. If you
choose a higher temperature,
Thermostatic Mixing Valves
located at each point of use are
particularly important to help
avoid scalding.
Temperature Time to Produce a
Serious Burn
120°F (49°C) More than 5 minutes
125°F (52°C) 1½ to 2 minutes
130°F (54°C) About 30 seconds
135°F (57°C) About 10 seconds
140°F (60°C) Less than 5 seconds
145°F (63°C) Less than 3 seconds
150°F (66°C) About 1½ seconds
155°F (68°C) About 1 second
For information about changing the
factory temperature setting, refer to
“Water Temperature Adjustment” on
page 15.
Even if you set the water heater set
point to a low seƫng, higher tem-
peratures may occur in certain circum-
stances:
• Water temperature will be hotter if
someone adjusted the temperature
set point to a higher setting.
• If the water supplied to the water
heater is pre-heated (for example,
by another water heater), the tem-
perature of the water may be high-
er than the temperature set point.
• Problems with the UIM (user
interface on two- or four-chamber
models) or other malfunctions may
result in higher than expected water
temperatures.
To reduce the risk of unusually hot wa-
ter reaching the fixtures in the house,
install ThermostaƟc Mixing Valves at
each point of use.
If anyone in your home is at parƟcular
risk of scalding (for example, the el-
derly, children, or people with disabili-
Ɵes) or if there is a local code or state
law requiring a certain water tempera-
ture at the hot water tap, then these
Electric Tankless Water Heater • 3
To reduce the risk of property
damage, serious injury or death,
read and follow the precauƟons below,
all labels on the water heater, and
the safety messages and instrucƟons
throughout this manual.
General Requirements
• Install and properly ground the
unit in accordance with local
codes, or in the absence of local
codes, with the current edition
of the National Electrical Code:
ANSI/NFPA 70 in the USA or
CSA standard C22.1 Canadian
Electrical Code, Part 1 in Canada.
• Follow all applicable plumbing,
heating, and air conditioning
codes during installation.
RISKS DURING INSTALLATION
AND MAINTENANCE
WARNING
Electric Shock Risk
Contact with the electrical
parts inside the water heater
can result in severe injury or
death from electrical shock:
• Disconnect power by opening the
circuit breaker(s) before installing
or servicing.
• SOME MODELS ARE CONNECTED
TO MORE THAN ONE BRANCH
CIRCUIT, AND MORE THAN ONE
DISCONNECT SWITCH MAY BE
REQUIRED TO DEͳENERGIZE THE
EQUIPMENT. ALL BRANCH CIRͳ
CUITS MUST BE DISCONNECTED
PRIOR TO SERVICE.
• Use a non-contact circuit tester to
confirm that power is off before work-
ing on or near any electrical parts.
• Be sure the cover is reinstalled and
secured after servicing to reduce
the risk of fire and electric shock.
RISKS DURING OPERATION
WARNING
Scalding Risk
This water heater
can make water hot
enough to cause
severe burns instantly, resulting in
severe injury or death.
• Feel water before bathing or
showering.
• To reduce the risk of scalding,
install Thermostatic Mixing
Valves (temperature limiting
valves) at each point of use.
These valves automatically mix
hot and cold water to limit the
temperature at the tap. Mixing
valves are available at your local
hardware store or from your
plumbing supplier. Follow the
manufacturer’s instructions for
installation and adjustment of the
valves.
• For all models, the temperature
set point is factory set to 120°F
to reduce the risk of scalding.
Exception: single chamber (point-
of-use) models are factory set to
approximately 105°F.
• Higher temperatures increase
the risk of scalding, but even at
120°F, hot water can scald. If you
choose a higher temperature,
Thermostatic Mixing Valves
located at each point of use are
particularly important to help
avoid scalding.
Temperature Time to Produce a
Serious Burn
120°F (49°C) More than 5 minutes
125°F (52°C) 1½ to 2 minutes
130°F (54°C) About 30 seconds
135°F (57°C) About 10 seconds
140°F (60°C) Less than 5 seconds
145°F (63°C) Less than 3 seconds
150°F (66°C) About 1½ seconds
155°F (68°C) About 1 second
For information about changing the
factory temperature setting, refer to
“Water Temperature Adjustment” on
page 15.
Even if you set the water heater set
point to a low seƫng, higher tem-
peratures may occur in certain circum-
stances:
• Water temperature will be hotter if
someone adjusted the temperature
set point to a higher setting.
• If the water supplied to the water
heater is pre-heated (for example,
by another water heater), the tem-
perature of the water may be high-
er than the temperature set point.
• Problems with the UIM (user
interface on two- or four-chamber
models) or other malfunctions may
result in higher than expected water
temperatures.
To reduce the risk of unusually hot wa-
ter reaching the fixtures in the house,
install ThermostaƟc Mixing Valves at
each point of use.
If anyone in your home is at parƟcular
risk of scalding (for example, the el-
derly, children, or people with disabili-
Ɵes) or if there is a local code or state
law requiring a certain water tempera-
ture at the hot water tap, then these
SAFETY
4 • Electric Tankless Water Heater
precauƟons are parƟcularly important.
According to a naƟonal standard, Ameri-
can Society of Sanitary Engineering
(ASSE 1070), and most local plumbing
codes, the water heater’s temperature
set point should not be used as the sole
means to regulate water temperature
and avoid scalds.
Properly adjusted ThermostaƟc Mixing
Valves installed at each point of use
allow you to set the water heater’s
set point to a higher seƫng without
increasing the risk of scalds. A higher
temperature can help provide proper
water temperatures for appliances such
as dishwashers and washing machines.
WARNING
Fire Risk
To reduce the risk of a
fire that could destroy
your home and seri-
ously injure or kill people:
• Do not store things that can burn
easily such as paper or clothes next
to the water heater.
• Be sure the water heater’s cover
is in place. This cover keeps debris
from entering and potentially being
ignited, and helps keep any internal
fires from spreading.
• Keep the water heater from becom-
ing wet. Immediately shut the water
heater off and have it inspected by
a qualified person if you find that
the wiring or control board have
been exposed to water in any way
(e.g., leaks from plumbing or leaks
from the water heater itself). Such
leaks can damage property and
could cause a fire risk. If the water
heater is subjected to flood condi-
tions or has been submerged in
water, the entire water heater must
be replaced.
• Make electrical connections prop-
erly according to the instructions on
page 13. Use a UL listed or CSA
approved strain relief. Connect the
ground wire to the ground lug. (The
ground lug is identified by a green
and white ground label inside the
water heater.)
Water Contamination Risk
Do not use chemicals that could
contaminate the potable water sup-
ply. Do not use piping that has been
treated with chromates, boiler seal, or
other chemicals.
4 • Electric Tankless Water Heater
precauƟons are parƟcularly important.
According to a naƟonal standard, Ameri-
can Society of Sanitary Engineering
(ASSE 1070), and most local plumbing
codes, the water heater’s temperature
set point should not be used as the sole
means to regulate water temperature
and avoid scalds.
Properly adjusted ThermostaƟc Mixing
Valves installed at each point of use
allow you to set the water heater’s
set point to a higher seƫng without
increasing the risk of scalds. A higher
temperature can help provide proper
water temperatures for appliances such
as dishwashers and washing machines.
WARNING
Fire Risk
To reduce the risk of a
fire that could destroy
your home and seri-
ously injure or kill people:
• Do not store things that can burn
easily such as paper or clothes next
to the water heater.
• Be sure the water heater’s cover
is in place. This cover keeps debris
from entering and potentially being
ignited, and helps keep any internal
fires from spreading.
• Keep the water heater from becom-
ing wet. Immediately shut the water
heater off and have it inspected by
a qualified person if you find that
the wiring or control board have
been exposed to water in any way
(e.g., leaks from plumbing or leaks
from the water heater itself). Such
leaks can damage property and
could cause a fire risk. If the water
heater is subjected to flood condi-
tions or has been submerged in
water, the entire water heater must
be replaced.
• Make electrical connections prop-
erly according to the instructions on
page 13. Use a UL listed or CSA
approved strain relief. Connect the
ground wire to the ground lug. (The
ground lug is identified by a green
and white ground label inside the
water heater.)
Water Contamination Risk
Do not use chemicals that could
contaminate the potable water sup-
ply. Do not use piping that has been
treated with chromates, boiler seal, or
other chemicals.
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Key Features
- Endless supply of hot water
- Compact design
- Easy to install
- Energy-efficient
- Flow rate of 1.8 gallons per minute
- Ideal for homes with up to 2 bathrooms
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Frequently Answers and Questions
What is the flow rate of the A.O. Smith R2VR-180E?
The flow rate of the A.O. Smith R2VR-180E is 1.8 gallons per minute.
How many bathrooms can the A.O. Smith R2VR-180E support?
The A.O. Smith R2VR-180E is ideal for homes with up to 2 bathrooms.
Is the A.O. Smith R2VR-180E energy-efficient?
Yes, the A.O. Smith R2VR-180E is energy-efficient and can save you money on your energy bills.
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