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ECCOTEMP
EM-2.5 / EM-4.0 / EM-6.0
Electric Mini Tank Water Heaters
Installation and Operating Instruction Manual

Important Safety Instructions 2
Technical Data 3-4
General Information 5
Technical Description 6
Installation Instructions 6-10
Plumbing Connections 7
Temperature & Pressure Relief Valve 7-8
Filling The Water Heater 9
Electrical Connections 9
Instructions For Use 10
Maintenance Instructions 11-13
Troubleshooting 14
Schematic Disassembly & Parts List 15-16
Warranty 17-19
Table of Contents

IMPORTANT SAFETY INSTRUCTIONS
WARNING: When using electrical appliances, safety precautions to
reduce the risk of fire, electric shock or injury to persons should be
followed, including:
1. READ ALL INSTRUCTIONS BEFORE USING THIS WATER HEATER.
2. This water heater must be grounded. Connect only to properly
grounded outlet. See “GROUNDING INSTRUCTIONS” found on
page 10.
3. Install or locate this water heater only in accordance with the
provided installation instructions.
4. Use this water heater only for its intended use as described in
this manual.
5. Do not use an extension cord set with this water heater. If no
receptacle is available adjacent to the water heater, contact a
qualified electrician to have one properly installed.
6. As with any appliance, close supervision is necessary when used
by children.
7. Do not operate this water heater if it has a damaged cord or plug,
if it is not working properly, or if it has been damaged or dropped.
8. This water heater should be serviced only by qualified service
personnel. Contact nearest authorized service facility for
examination, repair, or adjustment.
SAVE THESE INSTRUCTIONS
The manufacturer and/or distributor is not responsible for damages
caused by improper installation, or by non observance of the
instructions in this manual.
A QUALIFIED, LICENSED TECHNICIAN MUST ALWAYS INSTALL THE
WATER HEATER AND CONDUCT ALL SUBSEQUENT SERVICE WORK
AND/OR MAINTENANCE.
IMPORTANT!!!
FILL THE TANK COMPLETELY FULL WITH WATER AND HAVE WATER
FLOWING FROM THE HOT WATER FAUCET BEFORE ACTIVATING POWER
TO THE HEATER FOR THE FIRST TIME OR DAMAGE WILL RESULT.
2

MODEL EM-2.5 EM-4.0 EM-6.0
Capacity (gallons) 2.5 4.0 6.0
Voltage (Vac) 110-120 110-120 110-120
Power at 120 Vac (Watts) 1440 1440 1440
Max. Water Pressure (psi) 150 150 150
Weight (empty) (lbs.) 20 24 26
Amperage (Amps) 12 12 12
Phases 111
Technical Data
3

Dimensions
Model EM-2.5 EM-4.0 EM-6.0
A 14 ¾” 14 ½” 17 ¾”
B 11 ¾” 14 ½” 17 ¾”
C 10 ¼” 13” 14 ⁵⁄₈”
4
EM-2.5/EM-4.0
EM-6.0

GENERAL INFORMATION
The Eccotemp Mini Tank water heaters can be used in most under the
counter, point of use applications. EM Models are designed to supply hot
water for all hand wash and kitchen sinks in a residential, commercial or
industrial environment.
EM Models can replace traditional central hot water heaters thereby
conserving water and reducing energy waste. EM Models can also be
plumbed in series with the central water heater and act as a booster.
The Eccotemp Mini tank water heaters are lightweight and compact and
manufactured for easy installation. EM Models can be mounted on the
wall with included hardware, or freestanding.
EM Models are designed to operate at 150 psi maximum water pressure.
Install a pressure reducing valve if your water pressure is greater than
150 psi.
CAUTION!: The manufacturer cannot be responsible for the damage
caused by improper installation or by failure to follow instructions in
this manual. Comply with the Installation Instructions before connecting
to electrical outlet.
CAUTION!: The thermostat has been pre-set at the factory between
105° F (41° C) and 113° F (45° C).
CAUTION!: Hydrogen gas can be produced in a hot water system served
by this heater that has not been used for a long period of time (generally
2 weeks or more). Hydrogen gas is extremely flammable. To reduce
the risk of injury under these conditions, it is recommended that the
hot water faucet be opened for several minutes at the nearest and
most distant sink being served by this water heater before using any
electrical appliance connected to the hot water system (i.e. Dishwasher).
If hydrogen gas is present, there will probably be an unusual sound such
as air escaping through the faucet as the water begins to flow. There
should be no smoking or open flame near the faucet at this time.
WARNING: Installer should review the contents of this manual with
the owner upon completion of the installation, and the manual should
remain with the owner and placed in a location close to the water heater.
5

TECHNICAL DESCRIPTION
There are three Eccotemp Mini tank models, a 2.5 gallon model, a 4
gallon model & a 6 gallon model. The pressure vessel (water tank) is
welded, glass lined steel and is equipped with an anode rod.
The water heater is equipped with a thermostat and a high limit
temperature switch. A temperature/pressure relief valve is supplied
with the unit.
INSTALLATION INSTRUCTIONS
EM-2.5 / EM-4.0 / EM-6.0
The installation must be completed by a licensed professional. All state
and local codes must be adhered to. The manufacturer will not be liable
for any damages because of failure to comply with these installation
instructions or because of improper installation performed by an
unqualified installer.
CHOOSE A LOCATION that allows ease of access for maintenance or
servicing, ideally installed at least 9” from the ceiling (inside top of
cabinet) or any adjacent walls.
WALL MOUNTING
Fasten the supplied mounting bracket to the wall. Use screws that
are suitable for the wall material and the weight of the water heater
filled to capacity (EM-2.5 = 41 lbs, EM-4.0 = 57 lbs., and EM-6.0 = 76
lbs.) Hang the water heater on the bracket and pull downwards on the
water heater to insure that both “fingers” of the bracket are seated in
the mounting slots.
Confirm your water piping orientation (hot and cold pipes) before
wall mounting.
ONLY INSTALL IN VERTICAL POSITION.
Heater can sit on the floor. Confirm water piping orientation before
finalizing on floor. ONLY INSTALL IN VERTICAL POSITION! EM Models
can be installed under the sink.
6

PLUMBING CONNECTIONS
Connect the cold water inlet pipe to the inlet nipple (marked with a blue
ring) and the hot water outlet pipe to the outlet nipple (marked with a
red ring).
IMPORTANT: If Water pipes are copper or bronze, use dielectric
connections to prevent corrosion. Failure to provide dielectric insulation
may result in premature tank or nipple failure and may void your
warranty. Insure that the water heater is installed in a level position.
Install a shut off valve on the cold water side of the water heater.
The valve is for servicing and the valve should be in the open position
when the water heater is in operation. In order to protect the water
heater from heat damage due to soldering, solder a piece of tubing to a
threaded UNION fitting before screwing the UNION to the tank.
DO NOT APPLY HEAT DIRECTLY TO INLET OR OUTLET CONNECTIONS.
TEMPERATURE AND PRESSURE RELIEF VALVE:
CAUTION!: Install the Temperature/Pressure Relief Valve supplied with
the water heater!
Install a discharge pipe from the temperature/pressure relief valve
terminating at a sink or drain. DO NOT CAP OR PLUG THE END OF THE
DISCHARGE PIPE. THE DISCHARGE PIPE MUST BE UNOBSTRUCTED AND
FULL SIZED.
The T/P valve is certified by a nationally recognized test lab that
maintains periodic inspections of the listed equipment and meets the
requirements for relief valves and automatic shut off devices for hot
water supply systems ANSI 121.22-1979.
The T/P valve is marked with a maximum pressure, which does not
exceed the maximum working pressure of the water heater (150 PSI).
Install the T/P valve into the threaded opening at the top of the water
heater and orient the discharge tubing so that any discharge from
the valve will exit within 6 inches above, or at any distance below the
structural floor, and cannot contact any live electrical part.
7

T/P Valve Discharge pipe:
1. Must NOT be smaller in diameter than the outlet diameter of the
valve, or have any reducing couplings.
2. Must NOT be plugged or blocked.
3. Must be made of suitable material for hot water.
4. Must not be over 15’ in length.
5. Must not have more than two elbows.
6. Must terminate at an adequate drain.
7. Must not have a shut off valve between relief valve and tank or
relief valve and termination of discharge.
CLOSED SYSTEM THERMAL EXPANSION: Periodic discharge of the T/P
relief valve or failure of the element gasket may be due to thermal
expansion in a closed water supply system. The water utility supply
meter may contain a check valve, backflow preventer or water pressure
reducing valve which will create a closed water system. During the
heating cycle of the water heater, the heated water expands causing
pressure inside the water heater to increase. The T/P relief valve may
discharge hot water under these conditions which results in a loss of
energy and a build up of lime on the relief valve seat.
To prevent this from happening, there are two recommendations:
1. Install a diaphragm-type domestic hot water expansion tank
(suitable for potable water) on the cold water supply line. The
expansion tank must have a minimum capacity of 1.5 U.S. gallons
for every 50 gallons of stored water.
2. Install a 125 PSI pressure relief valve in the cold water supply line.
Make sure the discharge of this valve is directed to an open drain
and protected from freezing. Contact your local water utility or
plumbing inspector for information on how to control this situation.
Never plug the outlet of the relief valve.
8

FILLING THE WATER HEATER
CAUTION!: Before plugging the water heater electric cord into an outlet,
be sure that the system is completely charged with water and ALL AIR
IS REMOVED.
Before connecting the power, fill the tank and system with water and
check for leaks. To be sure that all air is out of the water system, open
the hot water faucets on your fixtures until constant water flows from
them. Otherwise any air remaining in the tank will cause the water
heater element to self destruct.
Filling the water heater:
1. Open the hot water faucet.
2. Open the cold water supply valve.
3. When continuous water flows out of the faucet, the tank is filled.
4. Close the hot water faucet.
5. Check entire system for leaks.
ELECTRICAL CONNECTIONS
To be certain that all of the air is out of the water heater, open the HOT
water faucet on your fixtures until constant water flows from them. If
air remains in the tank, the element will be damaged when the electric
cord is plugged in.
Connect the water heater to a GROUNDED OUTLET.
The water heater is fitted with a power cord that is intended to plug
into a grounded 110-120 V/AC receptacle. Adhere to all pertinent State
and local codes. Install the correct size circuit breaker into the master
panel. The Eccotemp ET water heater was manufactured and wired in
accordance with UL requirements.
The water heater is equipped with an overheat limiting device with a
manual reset. Also known as the temperature high limit, this device
has been factory installed to interrupt the power supply in the event
of a thermostat failure.
This water heater is designed for ONLY 110-120V electrical service!!!!!
DO NOT CONNECT TO HIGHER OR LOWER VOLTAGE.
Failure to use proper voltage may result in personal injury and/or
property damage. If the supplied electrical power cord is either
damaged or not long enough, do NOT use an extension cord. Have a
licensed electrician replace the power cord.
9

INSTRUCTIONS FOR USE
CONGRATULATIONS! You are now ready to use your water heater. Run
the hot water at a nearby sink and evaluate the hot water temperature.
Make any temperature adjustment using the section below:
SETTING THE THERMOSTAT:
The water heater is equipped with an adjustable thermostat that once
set will automatically control water temperature. The red indicator
lamp remains illuminated while the water is being heated. If the water in
the tank is at the desired temperature the lamp will NOT be illuminated.
The temperature adjusting knob will increase the temperature by
turning the knob clockwise and decrease the water temperature by
turning the knob counter clockwise.
When not being used for a lengthy period of time, you can conserve
energy by reducing the water temperature setting.
SETTING THE FREEZE PROTECTION:
When the water heater is not being used for an extended period of time
and there is a risk of freezing, either unplug and drain the water heater
OR turn the thermostat knob to the snowflake position to guard against
freezing. This position will keep the internal water temperature above
the freezing point. See photo below.
Temperature adjusting knob
10

MAINTENANCE INSTRUCTIONS
Do not attempt to repair this water heater yourself. Call a service
person (plumber or electrician) for service assistance. Always unplug
the power supply cord when the water is turned off or when servicing
or draining the water heater.
Before calling for service, first confirm that the water heater is properly
filled and that 110VAC power has not been interrupted.
WARNING: Before servicing or cleaning the water heater, turn off the
POWER switch and disconnect the power cord from the electrical outlet.
NOTE: For most maintenance operations, the water heater will be
drained. In all cases before draining first turn off the POWER switch and
then unplug power cord.
DRAINING AND REMOVING THE WATER HEATER:
1. Unplug the water heater.
2. Open a hot water faucet to let hot water run out. Allow
water to flow until water is no longer hot.
3. Turn off the cold water supply to the water heater.
4. Close the hot water faucet.
5. Disconnect the water heater from both the hot and cold
water connections.
6. If possible siphon out remaining water.
7. Carefully detach the water heater from the wall.
8. Tilt the water heater to drain remaining water out of
the heater.
REMOVING THE HEATING ELEMENT:
1. Turn off power supply, unplug water heater power cord and
drain (see above).
2. Remove cover.
3. Remove all the line wires from the heating element.
4. Unscrew the heating element retaining nuts.
5. Remove the element.
11

DESCALING THE HEATING ELEMENT:
Scale deposits can affect the heating capability of the element. Heavy
scale can even cause the element to burn out. The element can be
descaled chemically or manually.
1. Remove the heating element (see page 11).
2. To descale chemically, soak the heating element in white vinegar
or other descaling solution and then rinse well with fresh water.
3. To descale manually, let element dry and then using a non metallic
brush similar to a tooth brush; brush the residue from the element.
Avoid damaging the surface of the element.
4. Reinstall the element and gasket.
5. Refill tank with water before turning on the power to the
water heater.
REPLACING THE HEATING ELEMENT:
1. Unplug and drain the water heater (see page 11).
2. Remove heating element noting original positions of all connections.
3. Install new element with gasket making sure the new element and
gasket are positioned correctly.
4. Tighten retaining nuts and make the wire connections to their
original locations.
CHANGING THE THERMOSTAT:
1. Turn off the power switch and unplug the water heater from the
electric outlet.
2. Drain and remove the water heater. (see page 11)
3. Remove screws retaining the bottom panel of the water heater and
remove the panel.
4. Remove thermostat knob and unscrew two retaining screws.
It may be necessary to pry the knob off of the thermostat spindle.
Now remove front panel.
5. Disconnect the push-pull wire connectors on the thermostat noting
which connector goes to which terminal. Terminals are marked.
6. Remove the thermostat probe from the well.
7. Install new thermostat, attach wires and tighten screws.
12

RESETTING THE HIGH LIMIT SWITCH:
For various reasons the high limit safety shut off switch will
occasionally shut the water heater down. This shut down will occur
when water temperatures exceed 190°F. Power is automatically turned
off to the heating element. The shut off device may activate as a result
of a power outage or an electrical storm.
NOTE: Do not attempt to reset the high limit switch without first
allowing the water heater to cool down the high temperature water
inside the heater.
WARNING: Do not tamper with the reset button to over ride overheating
shut down.
1. Turn off the power switch and unplug the water heater from the
electric outlet.
2. Drain and remove the water heater. (see page 11)
3. Remove six screws retaining the bottom panel of the water heater
and remove the panel. Locate the high limit reset button.
4. Depress the small red button in the center of the junction box,
replace the bottom panel and place the water heater back into
service.
NOTE: A lower temperature setting saves energy and reduces the risk
of scalding.
CAUTION!: Call a technician if the high limit needs to be reset frequently.
13

TROUBLESHOOTING
PROBLEM: Water does not get hot
1. Make sure the power supply is on and working.
2. If light does not come on, check that the reset button is pushed in;
follow steps from previous section.
3. If the indicator light is illuminated, but water temperature does
not get hot at the sink, test for a plumbing crossover as follows;
shut off cold water supply to water heater and open hot water tap.
There should be no water flowing. Any continuous flow indicates
a cross over which will effect the temperature and will need to
be corrected.
4. If there is no crossover, then replace the heating element
(see previous sections).
PROBLEM: Indicator light not on
1. If the light does not come on, but water gets hot, check for
faulty bulb.
2. Check reset button; follow steps from previous section.
PROBLEM: Brown water
1. Brown or rusty water indicates a “spent” anode rod. Replace
anode rod.
PROBLEM: Odor in water
1. Smelly water could be due to an unusual reaction between local
water and the heater’s anode rod. Check anode rod.
PROBLEM: Water is too hot
1. Turn the temperature knob counter clockwise to a lower
temperature setting. If temperature does not lower within 60
minutes, then replace thermostat.
PROBLEM: Water is not hot enough
1. Under Instructions for Use, see “Setting the thermostat”.
PROBLEM: Water is leaking
1. Turn off power switch and unplug water heater from 110 VAC outlet.
2. Check water fittings and T&P fitting in the top of the tank.
3. Remove cover and inspect heating element gasket.
14

Schematic & Parts EM-2.5
No. Name of Part Qty.
1 Thermostat Button 1
2 Indicate Cover Light 1
3 Cross Self-Tapping Screw - 2.9x16 2
4 Cross Recessed Countersunk Screw - M4x6 2
5 Button Base 1
6 Thermostat Porcelain Base 1
7 Front Shell 1
8 Heating Element Seal Circle 1
9 T Shape Screw - M6x20 5
10 Hexagon Flange Nut +M6 6
11 Nut - M8 1
12 Connect Plate 1
13 Back Shell 1
14 Cross Self-Tapping Screw - 2.9x10 6
15 Thermal Cut-off 1
16 Insulate Circle 1
No. Name of Part Qty.
17 Heating Element Component 1
18 Magnesium Anode 1
19 Supporter 4
20 Power Cord 1
21 Inner Connect Wire 1
22 Bottom Cover of Body 1
23 Blue Pipe Circle 1
24 Red Pipe Circle 1
25 Tank Component 1
26 Liner Pipe 2
27 Stainless Steel Pipe with Hole 1
28 Blue Cover 1
29 Red Cover 1
30 Stainless Steel Pipe 1
31 T&P Valve Cover 1
32 Yellow Cover 1
15

Schematic & Parts EM-4.0 & 6.0
No. Name of Part Qty.
1 Panel Cover 1
2 Indicate Cover Light 1
3 Panel 1
4 Pan Head Self-Tapping Screw - 2.9x18 2
5 Electric Box 1
6 Thermal Cut-off 1
7 Thermal Cut-off Nut 1
8 Front Shell 1
9 Terminal Cover 2
10 Hexagon Flange Nut 5
11 T-Shape Screw 5
12 Heating Element Component 1
13 Tank Component 1
14 Bottom Cover of Body 1
15 Injection Hole Cover 1
16 Rivet 1
17 Blue Pipe Circle 1
18 Red Pipe Circle 1
19 Red Cover 1
No. Name of Part Qty.
20 Blue Cover 1
21 Water Inlet Pipe 1
22 Water Outlet Pipe 1
23 Liner Pipe 1
24 T&P Valve Cover 1
25 Yellow Cover 1
26 Magnesium Anode 1
27 Heating Element Seal Circle 1
28 Rubber Stopper 1
29 Cross Pan Head Screw 1
30 Thermostat 1
31 Power Cord Press Plate 1
32 Cross Self-Tapping Screw - 2.9x18 2
33 Cross Recessed Countersunk Screw - M4x6 2
34 Cross Self-Tapping Screw - 2.9x16 2
35 Screw Cover 2
36 Thermostat Buttom 1
37 Connect Wire 1
38 Power Cord 1
16

Eccotemp Mini Tank Water Heaters
EM-2.5, EM-4.0 and EM-6.0
LIMITED WARRANTY
Subject to the terms and conditions set forth in this limited warranty,
each Eccotemp Mini-Tank Water Heater is warranted to the original
owner (“Owner”) against (i) mechanical or electrical failure of any
component solely due to defects in materials or Manufacturer’s
workmanship for a period of two years from the date of original
purchase and (ii) leaks solely due to defects in materials or
Manufacturer’s workmanship for the later of (x) five years from the
date of original purchase or (y) the date of Owner’s occupancy of a new
dwelling in which the Eccotemp Mini-Tank Water Heater is installed.
However, if Owner cannot document the original date of purchase with
the original sales receipt, then the limited warranty period begins on
the date the Eccotemp Mini Tank Water Heater was manufactured.
As Owner’s sole and exclusive remedy, Manufacturer shall, at
Manufacturer’s sole election, either repair or replace the Eccotemp
Mini Tank Water Heater or the defective portion of such product.
Manufacturer is not liable for any costs incurred by Owner, including,
without limitation, the cost of any labor. Manufacturer’s maximum
liability is limited to the value of the water heater.
EXCLUSIONS AND LIMITATIONS OF THESE LIMITED WARRANTIES
THE LIMITED WARRANTIES PROVIDED HEREIN ARE IN LIEU OF ANY
AND ALL WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING BUT NOT
LIMITED TO IMPLIED WARRANTIES OF MERCHANTABILITY AND THE
FITNESS FOR A PARTICULAR PURPOSE; PROVIDED, HOWEVER, THAT
IMPLIED WARRANTIES ARE NOT DISCLAIMED DURING THE ONE YEAR
PERIOD FROM THE DATE OF ORIGINAL RETAIL PURCHASE.
ECCOTEMP SHALL HAVE NO LIABILITY HEREUNDER EITHER DIRECT OR
CONTINGENT, FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES. SOME
STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF INCIDENTAL
OR CONSEQUENTIAL DAMAGES, SO THE ABOVE LIMITATION OR
EXCLUSION MAY NOT APPLY TO YOU.
This warranty gives you specific legal rights, and you may have other
rights THAT vary from state to state.
17

These warranties shall be void and have no effect:
• If the Eccotemp heater is not used for its intended application;
• If the design or structure of the Eccotemp heater is modified or altered in
any way;
• If appliances or equipment not approved by Eccotemp are attached to the
water heater;
• If the water heater is not property installed in compliance with the latest
issue of (1) the National Electric Code, (2) the applicable plumbing codes, (3)
all local ordinances and regulations pertinent to similar water heaters, and
(4) the manufacturer’s recommendations and guidelines contained in this
and other documents included with the water heater;
• If the Eccotemp water heater is not operated within the factory calibrated
temperature limits;
• If leaks in the tank or defects in other parts arise as the result of improper
use, improper installation, negligence in operation, failures resulting from
accident, or from inability of the Eccotemp water heater or any parts to
function because of improperly made replacements and repairs, or damage
by fire, floods, lightning, or any other act of God;
• If the Eccotemp heater element or elements fail due to air entrapment;
• If the serial number label has been altered or removed;
• If the Eccotemp heater is installed in any area where leakage of the tank
or connections would result in property damage of any kind, or where
such a location is unavoidable, a suitable drain pan was not installed under
the water heater. When a drain pan must be used, the pan must meet all
applicable plumbing codes and be at least 2 1/2” deep, must protect an area
at least 1-1/2” greater than the lower external dimensions of the heater, and
must be piped by a minimum 1” pipe to a drain capable of discharge of at
least 20 GPM;
• If the Eccotemp heater or any of its components warranted herein are used
other than as a part of the complete and integrated system as sold to the
original purchaser;
• If leaks in the tank or defects in other parts arise as a result of (1) being
operated with deionized water, (2) as a result of sizing that does not comply
with the manufacturer’s published sizing recommendations or (3) use
with preheated water in excess of 140°F without the use of an approved
tempering valve.
• Replacements and/or repairs furnished under warranty carry only the
unexpired portion of the original warranty or 90 days whichever is longer.
The terms of this warranty may not be varied by any person whether or
not purporting to represent or act on behalf of Eccotemp.
18