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Marathon water heater thermostats

Marathon Upper thermostat
Upper thermostat
Larger image
Marathon Lower thermostat
Lower thermostat
Larger image

Marathon is ordinary non-simultaneous residential water heater... except with lifetime tank warranty .... and Marathon heavy-duty tank has 10 year warranty

Review Marathon water heater

Marathon Upper thermostat

Rheem SP310230
Rheem SP210245 30 gallon and larger


Marathon Lower thermostat

Rheem SP310020
Rheem SP210239 30 gallon and larger

Resource
Marathon parts sheet/ pdf

Marathon thermostats

High temperature thermostats: Rheem heavy-duty marathon is rated for 170 ℉/   10 year tank warranty

These are commercial grade therrmostats
Buy: Rheem Upper thermostat:
Rheem SP210246 High temperature

Buy: Rheem lower thermostat
High temperature lower thermostat

Marathon heavy-duty comes with 10 year tank and 5 year parts warranty
Upper and lower thermostats
thermostat temperature range

Buy residential upper and lower thermostats/ rated 150 ℉/ fits any Marathon 120-240 Volt water heater

Thermostats are interchangeable/
Each works with Marathon water heater
Buy: 90-150 degree F for residential tank:
Water heater thermostats at Amazon
Camco thermostats at Amazon
More thermostats
89T short/ dual-element thermostat at Amazon
Example Camco dual-element thermostat at Amazon
Therm-o-disc thermostat protectors

Thermostat protectors fit any therm-o-disc thermostat

Protectors cover the electric terminals.
When you adjust temperature, or push reset button, covers with protect you from electric shock
Buy:
SP310040 upper protector
SP310010 lower protector
Rheem marathon element

Upper element is fused to help prevent dry fire
Use 1-7/8 element wrench
1.5" UNF straight fine thread not 1" NPSM straight// 12-14 threads per inch vrs 11.5
Read parts .pdf before buying
Buy:
1-7/8" water heater element wrench
SP210197/ 3800 watt
SP210201/ 3000 watt
SP210198/ 3800 watt
SP213670/ 4500 watt
SP213480/ 3000 watt
SP213540/ 2000 watt
SP610130/ 3800 watt
SP213820/ 3800 watt
SP610140/ 5500 watt
SP610150/ 3000 watt
Resource
Marathon parts sheet/ pdf

Regular water heater elements/ identify and replace
All brands of thermostats are interchangeable

$48
for 2 low density 240 Volt 4500 watt elements/  + Upper and lower thermostat


Buy: LOW density kit:
Apcom plumbers pack Amazon

Resource
How to replace elements
How to replace thermostats

$35 for 2 high density 240 volt 4500 watt elements + Upper and lower thermostat

Apcom thermostats
Buy: HIGH density kit:
Apcom plumbers pack Amazon

Resource
How to replace elements
How to replace thermostats

New water heaters have high density elements. Low density elements might last longer
$45 for 2 low density 240 Volt 4500 watt elements/+ Upper and lower thermostat

Therm-o-disc thermostats
Buy: LOW density kit:
Therm-O-disc low density plumbers pack

Resource
How to replace elements
How to replace thermostats
$45 for 2 high density 240 Volt 4500 watt elements/ + Upper and lower thermostat

Therm-o-disc thermostats
Buy: HIGH density kit:
Therm-O-disc high density plumbers pack
Therm-O-disc high density

Resource
How to replace elements
How to replace thermostats
water heater thermostat

Take photo of wires ... before starting

Take photo of wires or draw picture showing location of each wire
Replace water heater thermostat
Larger image
See large image of overall wiring diagram
Wire colors can vary
Take photo of wiring before starting.

Steps to replace thermostat

Instructions are same for both upper and lower thermostats
Power is OFF, and tested that power is off using steps above

Remove wires from thermostat
Thermostat is held in place by metal spring that snaps over ears on thermostat
Pull back metal spring on both sides (make a tool using piece of coat hanger wire)
Slide out old thermostat
Put new thermostat in place, wiggle thermostat around to make sure it is held flat and tight against tank by metal spring
Thermostat reads temperature through surface of metal tank
Use screwdriver to adjust temperature
See images showing how to adjust temperature to 120 (or higher if hot water runs short)
Re-connect wires <> tighten screws very firm against copper wire
Important .... Push-in red reset button firmly to make sure it is engaged
After thermostat is replaced, put factory insulation back over thermostat
Insulation must cover thermostat to avoid higher water temperatures than desired set point
Tank must be full of water or elements will instantly burn out
Turn power ON
Put ear against water heater to hear bubbly fizzing sound that says water heater is 'on'
If tank is fully heated, water heater will not turn on. If tank is partially heated, then lower element will turn on. If tank is cold, then upper element will turn on. How it works
Put access doors back on tank
Access doors and insulation are required for thermostat to read correct temperature

Resources:
More detailed steps How to replace thermostats
If water heater is still not working, see troubleshooting

Use push-on wire connectors when wires are too short

Buy:
Push on wire connectors at Amazon
Red 3P connector (shown) for 10-14 gauge wire
Yellow 4P for 12-18 gauge wire
Push on wire connectors

Insulation and cover must be over thermostat.

Exposing thermostat to cool room temperature will cause tank to overheat.
Thermostat cannot read correct temperature unless covered correctly.

Buy:
Upper element terminal protector
Lower element terminal protector

Resources:
Troubleshoot electric water heater
Water heater leak

Inspection finds leak/ rust around element

Resources
Replace element and gasket
Inpect anode rod
Leaking water heater resources
How to install electric water heater
Water heater must be full of water or elements instantly burn out.
How to fill water heater:
Turn tub spout ON until full stream.
Open water heater TP valve for a moment to release last of air.
Turn power ON.
Resources:
How to test elements
How to replace elements
How electric water heater works
How to test and replace TP valve
Support the economy:
Buy: water heaters from my associate links:
50 gallon Gas water heaters at Amazon
40 gallon gas water heaters at Amazon
50 gallon Electric water heaters at Amazon
40 gallon electric water heaters at Amazon
Hybrid / heat pump/ water heaters at Amazon

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Troubleshoot electric water heater
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Icon gas valve

How to replace water heater element Waste King disposal
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