Question 1

Are these original Rheem brand parts?

Accepted Answer

Yes

Question 2

Can I substitute this part for sp213660 for a 75 gal Rheem Marathon water heater?

Accepted Answer

There are two concerns that you have to answer to determine if this is suitable for you.  Thread size of the fitting, and I feel like Rheem wouldn't change them for home heaters.  The other is the capability of the controls to handle the load that this element requires. If this element is less powerful than what you have, it will take longer to heat the water.  If it is more you risk burning out the circuits or worse.  The edge of the existing element will be marked with its rating - you should get the same rated one.  Hopefully the manufacturer answers your question since I have no idea what the model numbers you reference are.  I can tell you that I have all too much experience with customers burning their wiring systems up when they tried to install a 15KW heater on a circuit rated for 1.5KW .  (KW = Volts x AMPS, so amps = KW/Volts) so 1500/220 = 6.8 AMPS, 15000/220 =68 AMPs, If it is 110 Volts then the amps are doubled.

Question 3

Can this be installed in other Rheem standard water heater too?

Accepted Answer

These are 1.5” diameter screw in and most water heater elements  are 1”.  So verify the diameter of yours based on the model number.

Question 4

Looking for an electronic control for a 50gal. Tank rheem platinum water heater

Accepted Answer

There are several low cost controllers on Amazon that will do the job, provided that they control a SSR (Solid State Relay) rated for the amps needed, there are 2 and 3 pole models rated for 100 AMPS at 220.

AMPS = KW/Volts

The temperature sensor needs to be located where the water can actually be seen. If you are really Rube Goldberging it, the sensor can be clamped to the fitting as it is exiting the tank, provided said fitting is metal, copper preferred.  The sensor needs to be reliable, otherwise you will discover why there is a relief valve on your tank.  I recommend that keep the manufacturer's unit but set it for a higher temperature than you wish to control and then use yours to cycle the power.  Since I do not know if the heat is Gas or Electric , my answer is based on electric.

ASIN	B009DOBB8Y
Best Sellers Rank	#199,215 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #397 in Water Heater Replacement Parts
Brand	Rheem
Brand Name	Rheem
Color	stainless steel
Customer Reviews	4.6 out of 5 stars 109 Reviews
Global Trade Identification Number	00662766435764
Included Components	Water Heater Element
Item Length	16.5 inches
Item Type Name	SP213670-Water Heater Element
Manufacturer	Rheem
Material	Titanium
Material Type	Titanium
Model Number	SP213670
Number of Items	1
Number of Packs	1
Part Number	SP213670
UPC	662766435764
Unit Count	1 Count
Voltage	240 volts
Wattage	4500 watts

Rheem SP213670 SP213670-Water Heater Element

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