Waiwela MiniTank WM-1.0, MiniTank WM-4.0, MiniTank WM-6.0, MiniTank WM-2.5 Installation And Operating Instruction Manual
Mini Tank
Electric Mini Tank – Water Heaters
WM-1.0
WM-2.5
WM-4.0
WM-6.0
Installation and Operating Instruction Manual
Table of Contents
Important Safety Instructions 3
General Information 3/6
Technical Data 4 - 5
Technical Description 6
Installation Instructions 7
Plumbing Connections 7
Temperature & Pressure Relief Valve 8
Filling The Water Heater 9
Electrical Connections 10
Instructions For Use 10 - 11
Maintenance Instructions 11 - 14
Troubleshooting 15
Warranty 15 - 16/19
Schematic Disassembly & Parts List 18
Important safety instructions
Warning : When using electrical appliances, safety precautions to reduce the risk of re, electric shock
or injury to persons should be followed, including:
1. Read all these 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 qualied 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 qualied 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 qualied, licensed technician must always install the water heater and conduct all subsequent service
work and or maintenance.
Important: Never turn the water heater power on until the tank is completely full and water is owing out
of the hot water faucet.
General Information
The WaiWela Mini Tank water heaters can be used in most under the counter, point of use applications.
Models WM-1.0. WM-2.5, WM-4.0 and WM-6.0 are designed to supply hot water for hand washing
in a residential, commercial or industrial environment. The WaiWela mini tank water heaters are slow
recovery, small reservoir, not intended for showers or lling tubs. The WaiWela Mini tank water heaters are
lightweight and compact and manufactured for easy installation. The WM-1.0, WM-2.5, WM-4.0 and WM-
6.0 are designed to be mounted on the wall. Not sure call us at 800.605.6542.
Page 3
Technical Data
Model WM-1.0 WM-2.5 WM-4.0 WM-6.0
Capacity Gallons 1.3 2.5 4.0 6.0
Voltage Vac 110-120 110-120 110-120 110-120
Power at 120 Vac Watts 1440 1440 1440 1440
Max. Water Pressure psi 150 150 150 150
Weight (empty) lbs. 12 1/2 20 24 26
Amperage Amps 12 12 12 12
Phases 1 1 1 1
Assembly Figure
Temperature &
Water outlet
Pressure relief valve
Water inlet
Power
Water Flow Figure
water outlet
Thermostat
Indicator light
Water Inlet
Shell
Tank
Insulation Foam
Page 4
Dimensions
B
C
Model WM-1.0 WM-2.5 WM-4.0 WM-6.0
A (inch) 12 1/2” 14 1/2” 19 1/4” 18”
A
Schematic Construction
Thermostat
Heating
element
Sensor
Switch
B (inch) 11 ” 11 3/4” 11 3/4” 15 3/4”
C (inch) 10” 10 3/8” 10 3/8” 15 1/2”
Indicator Light
Insulation
Foam
Tank
Wire support
Fastening plate
Power Wire
Overheating protection
device
Thermostat
Thermostat
Overheating
protection device
Indicating
Light
Heating
Element
Power Plug
1
/
Switch
(
1
/
Wire Support
Grounding wire
Wiring Diagram
Power
Page 5
General Information Cont.
The WM-1.0, WM-2.5, WM-4.0 and WM-6.0 are designed to operate at 150 psi maximum water pressure.
Install a pressure reducing valve if your water pressure is greater than 80 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 41°C (105°F) and 45°C (113°F).
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 ammable. 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 ow.
There should be no smoking or open ame 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.
Technical description
There are four WaiWela Mini tank models, a 1.0, 2.5, a 4.0 and a 6.0 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.
Page 6
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