ECO180
ECO240
ECO270
ELECTRIC TANKLESS WATER HEATER
INSTRUCTIONAL
MANUAL
Keep this manual with you after your unit has been installed, you
may need it for further technical information.
USA (855) 627-3955 PR (787) 727-0277www.Marey.com
Congratulations! You’ve just purchased a new Marey ECO tankless water heater and
will soon begin to enjoy the benets of “going tankless.”
Please take the time to thoroughly read and understand this safety and installation
manual in its entirety before you attempt to install your new tankless water heater, as it
contains important safety tips and instructions.
Please carefully read all instructions and warnings. Should you have any questions,
please visit www.marey.com for installation videos and FAQ.
Please keep this manual for future reference and technical information.
INDEX
QUICK START GUIDE
WARNING
IMPORTANT WARNINGS
IMPORTANT SAFETY INFORMATIONS
PRODUCT FEATURES
PRODUCT ADVANTAGES
INSTALLATION DIAGRAM
TECHNICAL SPECIFICATION REQUIREMENTS
PRODUCT INNER STRUCTURE
INSTALLATION GUIDELINE
TROUBLE-SHOOTING/DIAGNOSTIC CHART
ELECTRICAL DIAGRAM
CUSTOMER SERVICE
04
05
05
05
06
07
07
09
10
11
19
21
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QUICK START GUIDE
ECO180 | 240 | 270
1) Mounting
Mount vertically on a at surface (i.e. board or wall) larger than the unit itself. Make
sure bracket is secure by utilizing a stud or the provided wall anchors. Keep away
from any potential splashing or leaking water and strong magnetic elds.
2) Water Connections
When installing your water connections make sure to use ¾" NPT ttings. Please use the
provided gaskets to prevent leaks. When tightening ttings use a back-up wrench on inlet
and outlet ttings (at sides of ttings are located behind front cover). It is recommended to
install a high pressure discharge valve and a shut off valve on the incoming water line, in
that order. Open a faucet and run water through the unit for a few minutes to purge out air,
turn off at faucet to build up pressure in the line to check for leaks.
3) Electrical Connections
Wiring for electrical connection will differ depending on model please double check the
model type on the right side of the unit.
ECO180
GROUND BREAKER 1
ECO180 -
Two 240V Double Pole 50 amp breakers
BREAKER 2
GROUND BREAKER 1 BREAKER 2 BREAKER 3
ECO270 - Three 240V Double Pole 40 amp breakers
ECO240
ECO270
GROUND BREAKER 1 BREAKER 2 BREAKER 3
ECO270 - Three 240V Double Pole 50 amp breakers
4) Operation
Unit is activated by the ow of water through the inlet. A desired temperature set point is
selected by using the "up" or "down" buttons, if unit does not respond push the center
"power" button and try again. Test water to prevent scalding.
04
WARNING
If your water heater requires a reset, be sure to TURN OFF THE BREAKERS prior to resetting
the unit.
Resetting your unit without turning off the breakers can result in personal injury and damage
to your water heater.
WARNING! There is water contained in the coils of your water heater at all times. If your
water heater is exposed to freezing temperatures, the water in the coils could freeze, causing
a break in the heat exchanger of the unit, or the supply and return lines. This kind of damage
will result in water running freely into the space where the water heater is located, which can
cause ooding. DO NOT install this water heater where it may be subjected to a freeze. If your
water heater is in an area where freezing is a possibility, you must turn off the water to the
heater and drain it of any water by disconnecting the water lines. Leave the water lines
disconnected until you intend to use the water heater.
IMPORTANT WARNINGS
This is not a do-it-yourself project. If you are not familiar with basic plumbing and electricity,
we strongly recommend that this water heater be installed by a licensed plumber and/or
electrician.
Installation of this product is restricted to indoor locations.
Under no circumstances should you attempt to install, repair or disassemble the Marey Heater
tankless electric water heater without rst shutting off all power to the unit directly at the
circuit breaker panel.
IMPORTANT SAFETY INFORMATION
1) The installation must be in compliance with your local electrical and plumbing codes.
2) This water heater must be GROUNDED.
3) AII wiring and installation must be supervised by a qualied electrician.
4) CAUTION:This product has more than one power-supply connection point. Disconnect all
power supplies before servicing.
5) This water heater is not intended for use by persons (including children) with reduced
physical, sensory or mental capabilities, or lack of experience or knowledge, unless they
have been given supervision or instruction concerning the use of the water heater by a
person responsible for their safety. Children should be supervised to ensure that they do
not play with the water heater.
05
6. This water heater MUST be permanently connected to a xed circuit breaker.
7. DO NOT install this water heater near volatile or ammable substances, near tinder wood or
near a strong magnetic eld.
8. DO NOT switch the heater on if you suspect that it may be frozen. Wait until you are sure
that it has completely thawed out.
9. Before taking a shower, feel the outlet hot water temperature with your hand to make sure
it is suitable for showering to avoid getting scalded.
10. Before connecting the water heater hoses to the plumbing in your home, it is extremely
important to FLUSH the lines to wash out any plumbing paste or residue in the lines.
11. The heating chamber is treated with composite nano-insulation material. It is normal for
there to be a slight odor and possibly a small amount of green/blue smoke when the unit is
used for the rst time.
12. If there is damage to the wiring or any internal part, you must contact a qualied electrician to replace it, or send it to one of our service centers for repair.
(Replacement parts are available from Marey.)
13. The shower head should be cleaned and checked periodically for debris and build-up.
14. This water heater must be installed vertically, per the mounting instructions.
PRODUCT FEATURES
1. Energy efcient, instantaneous heating on demand. It's tankless, so no preheating and no
stand-by heat loss, which saves even more energy.
2. Micro-computer controlled, patented heating technology.
3. Extremely safe! Water is completely separated from electricity by multi-layers of composite
nano-insulation material, and the heater contains multiple additional safety devices, as
outIined below.
4. Over-heating treaches 153° F / 67°C, the electricity is automatically cut off. If this occurs,
the screen hermal cut-off to avoid scalds. When the outlet water temperature beeps and
displays an E1 code.
06
5. Malfunction sensor. If there is a malfunction with the temperature sensor, the heater
stops working and the screen displays an E3 code.
6. Dry-heating thermal cut-off. In case of dry heating, the electricity will be cut off and the
screen display will display an E4 code.
7. Micro-computer features an automatic electricity and water consumption calculating
function.
PRODUCT ADVANTAGES
Marey heating elements are made from a single piece of cast
aluminum, so there will never be water leakage non electric
leakage in the heating chamber. Marey heaters also have an extra
stainless steel water ow channel instead of the previous layered
plate style, so no matter how your water quality is inside the
heating element, it will provide a long life of service.
Fig. 01
INSTALLATION DIAGRAM
ECO180
Fig. 02
2x50 amp 2-pole
208/240V Breakers
07
ECO240 /
/ECO270
Fig. 03
ECO240 = 3 x 40am
2-pole 208/240V Breakers
ECO270 = 3 x 50am
2-pole 208/240V Breakers
Water out
08
High pressure
discharge valve
Ball valve/shut off valve
Water in
Fig. 04
TECHNICAL SPECIFICATIONS AND INSTALLATION REQUIREMENTS
PRODUCT CODE ECO180 ECO270
Energy
Minimum Required Circuit Breaker
Max. Amp. Load
Min. Wire Size
18kW
2x50A
75A
2x6
AWG Copper
Voltage/Frequency
Water Connections
Recommended Min. Flow Activation
Safe Operating Pressure
Dimensions
Weight
*Wire gauge varies by amperage and distance; must contact electrician if you are not sure.
17.7 lbs 18.3 lbs
ECO240
27kW
3x40A
100A
3x8
AWG Copper
27kW
3x50A
112.5A
3x6
AWG Copper
240V, 60Hz
3/4” NPT
0.85 GPM / 3.2 L/min
5 PSI - 85 PSI
11.0” x 16.1” x 3.5”
17.8 lbs
ECO180
KW
18 kW
Power
AMP
2x50 Amp
Breaker
V
ECO240
240V
Multiple Points
Of Use
KW
24 kW
Power
ECO270
KW
27 kW
Power
AMP
3x40 Amp
Breaker
AMP
3x50 Amp
Breaker
MAX
50ft Max Distance
To Point of Use
German
Technology
Digital Panel Non-Corrisive
Overtemp
Protection
Activates With
Low Water Pressure
No Preheat Micro-Chip
Computer
09
PRODUCT INNER STRUCTURE
260mm
ECO180
ECO180
Heating Chamber
Bottom Case
Control Board
285mm
260mm
ECO240 / ECO270
285mm
Temp.
Sensor
Temp. Sensor
ECO240 / ECO270
Heating Chamber
Fig. 05
E L1 L2 L1 L2
Flowmeter
E L1 L2 L1 L2 L1 L2
Flowmeter
Display Screen
Terminal blocks
Bottom Case
Control Board
Display Screen
Terminal blocks
10
Water out
High pressure
discharge valve
Ball valve/shut off valve
Water in
Fig. 06
INSTALLATION GUIDELINES
NOTE: Installation must be in compliance with the National Electrical Code and your local
electrical and plumbing codes.
1. Do not instal I the unit in a room where there is a chance of freezing.
2. DO NOT install this water heater near tinder, volatile or ammable substances, or near a
strong magnetic eld. The unit must only be mounted in a VERTICAL position near the water
ttings.
3. Mount the unit to a at section of walI, welI away from any potential water splashes or
spray. Be sure to use wall anchors, or screw directly into studs.
4. Position the unit upright with all plumbing connections at the bottom of the unit.
5. Make sure the water heater and all ttings are complete and intact.
6. Make sure that the main power supply, water pressure, ground, amperage, voltage, and
wiring meet all standards.
7. The water heater must be connected to a properly-grounded, dedicated branch circuit with
the proper voltage rating. The ground must be connected to the "ground bar" at the circuit
breaker panel.
8. This water heater MUST be permanently connected to xed and dedicated circuit breakers.
If the heater will be unused, switch off the circuit breakers.
INSTALLATION
Locate an appropriate place on a section of wall that meets all safety and installation
requirements.
Front and back of the appliance (please see Fig. 07).
11
Fig. 07
Fig. 08
12
Fig. 09
Hold the back bracket hanger in position against the wall in the desired hanging location.
Check to make sure that the bracket is level. Mark the wall where the mounting holes should
be located. Drill holes of¼" diameter in the marked locations. If you are on a stud, screw the
bracket directly into the wal I. If you are not on a stud, insert the plastic anchor in the hole,
and secure the bracket using the screws supplied (Fig.10).
Fig. 10
Remove (4) screws and washers (Fig 11) from the unit to free the front cover. Carefully lift the
front cover off the unit a few inches. Disengage the ribbon cable connecting the front cover
LCD panel to the main control board or the unit (Fig 12). Remove the cover completely.
Please note: If LCD connection cable cannot be disengaged, simply set the front cover aside
and keep the cable connected.
Fig. 11
13
Fig.12
Attach unit to mounting bracket by sliding onto tabs. Make sure the unit is properly secured
to both tabs of the bracket. Install bottom, center screw to afx the unit to the bracket to
complete mounting.
Important notes about water connections:
1. All water pipe must comply with national and applicable state and local water pipe codes.
2. The unit should be connected directly to the main water supply. Flush pipe with water to
remove any debris or loose particles.
3. AlI connections to the unit should be ¾" NPT. Larger pipe can be connected but the
appropriate adapters must be used.
4. Please remember to install rubber seal rings at the connections. When all water
connections are completed, check for leaks and take corrective action before proceeding.
Connect the cold water supply to the threaded pipe labeled "inlet" and the hot water to
the threaded pipe labeled "outlet." IMPORTANT: RUBBER WASHER MUST BE USED FOR
PROPER SEAL.
14
Please use a backup wrench when installing water ttings. Connections are 3/4" NPT (Fig.13)
Outlet
Rubber Washers
Fig.13
Backup Wrench
Inlet
Important notes about electrical connections:
1. Before beginning any work on the electrical installation, be sure that the main breaker
panel switch is OFF to avoid any danger of electric shock. All mounting and plumbing MUST
BE completed before proceeding with the electrical installation.
2. AII electrical work must comply with national and applicable state and local electrical
codes.
3. AII units must be connected to a properly grounded, dedicated branch circuit of proper
voltage rating.
4. ECO18O: Requires two dedicated double pole circuit breakers (2x5Oamp). Use two
insulated supply cables per double pole breaker and a ground wire to connect to "ground
bar".
ECO240 and ECO27O: Require three dedicated double pole circuit breakers (3x40amp for
EC027O - 3x5Oamp for EC027O). Use two insulated wires for each of the three separate
double-pole breakers and a ground wire connected to the "ground bar".
15
5. When connecting the wires to the terminal blocks, make sure the metal wire ends and the
terminal blocks completely touch. Then, tighten the screws securely. Failure to properly
tighten can result in an electrical short and burning of the terminal blocks.
Connect the power at the lower right side of the unit to the terminal block. Each pair of Ll and
L2 should have its own corresponding double polled breaker. Note that the ECO 180 unit will
be connected to two double pole circuit breakers while the EC0240 and EC0270 units will be
connected to three double pole circuit breakers (Fig.14).
ECO180
16
ECO240 / ECO270
Fig.14
Reattach the ribbon cable for the LCD panel if disconnected and reinstal I the front cover
using the screws and washers previously removed. (Fig.15).
Fig. 15
How the unit works
1. This unit heats water instantaneously as it ows across the heating elements.
2. The electronic control monitors the ow rate and the incoming water temperature and then
switches on the required number of heating elements to reach the set temperature.
3. The outlet water temperature will be higher than the setting if the minimum ow rate isn't
met. The outlet water temperature will be lower than the setting if the maximum ow rate is
exceeded.
Using the water heater-operation instructions
1. Turn on the water and allow it to run through the unit for a few minutes, until water ow is
continuous and all air is purged from the water pipes. Check for and correct any leaking
connections.
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2. Turn on the circuit breakers to provide power to the unit.
3. Press the center button to turn on the heater. NOTE it will not start heating until water is
provided to the unit.
If there is power to the unit, but no digital display, turn off the circuit breaker. Double check to
make sure that the cable to the LCD panel on the front cover is correctly connected inside the
unit, then turn the breaker back on.
4. After the unit is supplied with power, a beep sound can be heard and the display ashes
the set temperature, then goes solid showing the actual output temperature for 30 seconds
until the screen goes blank. the unit is now in standby mode.
5. Press the power button to activate/deactivate the unit. When the unit is ON, the LED display
shows the actual water temperature of the outlet water.
6. The outlet water temperature can be adjusted by changing the temperature settings on the
heater. Press and to adjust the temperature. The range of options for the temperature
setting is 30°C-52°C/86° F-125° F.
WARNING: If the unit has been used recently, you may initially get a short burst of very hot
water from the unit. Allow a few seconds for the water to cool down to the set point. Test the
water before you take a shower. If the unit will not be used during winter, drain out any water
completely so that the heater will not freeze.
Periodically clean the inlet lter screen and the shower head to maintain strong water ow.
7. Press then press to convert the temperature display between Fahrenheit and Celsius.
8. The unit features an automatic memory function to avoid repetitive operation. When you
turn on the water heater, the default set point will be the same as the last setting used.
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TROUBLE-SHOOTING / DIAGNOSTIC CHART
PROBLEMS POSSIBLE CAUSES CORRECTIVE ACTIONS
1. Inlet and outlet
ttings leaking
2. Blank screen
3. Functional keys
not working
4. Water too hot
5. Water too cold
6. Outlet ow
noticeably decreases
7. LED displays E1
8. LED displays E3
9. LED displays E4
10. Pressure relief valve
releases water
A. Fittings not tight
B. Rubber washer worn-out
A. Power not connected.
B. LCD damaged.
C.LCD not connected to PCB.
A. No water output.
B. Water ow is too low.
C. Key or PCB damaged.
A. Temperature setpoint too high.
B. Water ow is too low.
A. Low temperature set.
B. Too much waer ow.
Inlet strainer or shower clogged.
Outlet temperature is over 67°«C»/
153° F.
Temperature sensor failure.
Dry Heating.
A. Outlet blocked.
B. Inlet pressure over lOOpsi or 0.7Mpa.
A. Tighten ttings.
B. Change rubber washer.
A. Connect power to the unit.
B. Change LCD.
C. Connect LCD to the PCB Board
A. Check water supply valves.
B. Open valve to increase ow.
C. Change key or PCB.
A. Set a lower temperature.
B. Open valve to increase water ow.
A. Set a higher temperature.
B. Reduce water ow.
Clean strainer and shower.
A. Reduce the temperature.
B. Turn up the water ow.
Please contact with the local dealer.
Shut off. Clean all outlets from any
debris, dirt, any particle or scale
inside the pipe.
A. Clean shower set.
B. Reduce water pressure.
11. Display overow
Inlet water ow is too high.
Reduce the inlet water ow.
WARNING: Corrections to problems 8, 9 and 10 should only be performed by qualied electrician or plumber. The person who initially installed the unit is the best one to contact for help,
or contact Marey for service.
19
#4 or #9
#11
Arrows and
waves
indicate
waterflow
Fig. 16
Campfire
indicates
power to
heating
elements
NORMAL MAINTENANCE
Note: Do not attempt to repair this water heater yourself. Please call a service person for
assistance. Always be sure to turn off all the breakers connected to your unit before servicing.
To ensure consistent water flow, the following is recommended:
1. Periodically remove build-up and dirt that may accumulate at the aerator of the faucet or in
the shower head.
2. Periodically clean the built-in lter screen in the inlet connection of your water heater.
Water supply must be turned off before cleaning the screen.
20
ELECTRICAL DIAGRAM
Thermal Cut-Out 90°C
L1
L2
L1'
L2'
L1''
L2''
E
L1
L2
L1'
L2'
E
Outle t Temp. S ensor
Thermal Cut-Out 90°C
Fig. 17
Control
System
Control
System
Display
Screen
T1 R1
T2
R2
Inlet Temp. Sensor
Flowmeter
T1 R1
T2 R2
T3
R3
Outle t Temp. S ensor
Display
Screen
Inlet Temp. Sensor
Flowmeter
Fig. 18
REMARK: L: LINE R: HEATING SYSTEM T: TRIAC
21
ECO180
Heating Chamber
Bottom case
Control Board
Display Screen
Temp. Sensor
Temp. Sensor
E L1 L2 L1 L2 L1 L2
Flowmeter
ECO240 / ECO270
Heating Chamber
E L1 L2 L1 L2 L1 L2 L1 L2
Flowmeter
Fig. 19
Terminal blocks
Bottom case
Control Board
Display Screen
Terminal blocks
22
Please feel free to contact us if you have any questions about our products,
warranty service, or if you need assistance installing a unit. We also strive
for continuous improvement, so we welcome your comments, feedback
and suggestions.
U.S.A
+1 (855) 627-3955
PUERTO RICO
(787) 727-0277
customerservice@marey.com
www.Marey.com
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