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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 above).

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 prior instructions).

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 12)

3. 

Remove six 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.

Thermostat

Page 13

Summary of Contents for MiniTank WM-2.5

Page 1: ...Electric Mini Tank Water Heaters WM 2 5 WM 4 0 Installation and Operating Instruction Manual http waterheatertimer org How to install under counter water heater html...

Page 2: ...ical Description 6 Installation Instructions 6 10 Plumbing Connections 7 Temperature Pressure Relief Valve 7 8 Filling The Water Heater 9 Electrical Connections 10 Instructions For Use 11 Maintenance...

Page 3: ...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...

Page 4: ...ltage Vac 110 120 110 120 Power at 120 Vac Watts 1440 1440 Max Water Pressure psi 150 150 Weight empty lbs 20 24 Amperage Amps 12 12 Temperature and Pressure Relief Valve Water inlet Water outlet wate...

Page 5: ...2 19 1 4 B inch 11 3 4 11 3 4 C inch 10 3 8 10 3 8 Dimensions Switch Heating element 1 1 Switch Thermostat Indicate Light Heating Element Power Plug Switch Overheat Limiter Wire Support Schematic Con...

Page 6: ...mply 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 prod...

Page 7: ...ed by an unqualified installer CHOOSE A LOCATION that allows ease of access for maintenance or servicing ideally installed at least 8 to 9 from the ceiling inside top of cabinet or any adjacent walls...

Page 8: ...Y 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 temperatur...

Page 9: ...h 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 wa...

Page 10: ...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 h...

Page 11: ...into the master panel The WaiWela WM water heater was manufactured and wired in accordance with UL require ments The water heater is equipped with an overheat limiting device with a manual reset Also...

Page 12: ...luminated 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...

Page 13: ...es 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...

Page 14: ...er see prior instructions 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 Tigh...

Page 15: ...e 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 wate...

Page 16: ...ght 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...

Page 17: ...d Circle 1 19 Front Cover 1 Schematic Disassembly WM 2 5 WM 4 0 Parts List WM 2 5 WM 4 0 Page 16 22 9 2 1 7 5 16 33 29 30 12 13 15 34 35 36 23 6 27 14 18 11 32 31 25 37 38 26 20 24 10 8 28 3 21 17 19...

Page 18: ...material or workmanship within two 2 years from date of original installation in a single family residential application used with potable water deemed not to be hard water or within one 1 year if use...

Page 19: ...turer f The water heater is installed by non qualified personnel 5 The OWNER and not the Manufacturer or his agent representative shall be liable for and shall pay for all field charges for labor or o...

Page 20: ...service request is made be sure to include Proof of Purchase the water heater model number and the date of manufacture date of installation Dealer s name and the watts and voltage 4 When returning th...

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