Yes, just buying a home with a RHEEM AC unit, Model RBHC-1711SFH. Can you tell me the approximate age.....I can't seem to find it on the label.

Do you mean size?... height, width, and diameter of a specific model?
Or do you mean the length of warranty coverage. You will need serial number located on label on side of tank.
Or do you mean age of water heater?

Suggest contacting Rheem.com

http://waterheatertimer.org/Water-heater-warranty-by-brand.html
http://waterheatertimer.org/pdf/Find-Age-of-water-heater.pdf

Gene


If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

I would call home depot and ask how they handle their warranty with Rheem. Contact your builder and get the information of the plumier that installed the unit he should be able to give you the pluming supplier where he purchased the heater.

It's 2 tons still 3 years later:)

Model number of the inside unit is required

Please look at label on side of unit for brand, Model and Type of water heater, and include approximate age of water heater.
Add a comment with that information.
This will let me access specific information about your water heater.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

First thing is to look at label on side of unit.
This will show what brand, type and model water heater you have.
Then repost question with that information so expert can access correct information.
Also include if this is a new water heater, or old water heater that stopped working, and approximate age of unit since models change very quickly today.



If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Product type and brand and model number are on label on side of unit. Describe approximate age of heater, and include if this is new installation or if unit worked before and stopped working.
Copy following links to get started.
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

You can find age of water heater from serial number located on label on side of tank.
Label also shows tank size, and tank wattage and element wattage

http://waterheatertimer.org/Figure-Volts-Amps-Watts-for-water-heater.html
http://waterheatertimer.org/Water-at-bottom-of-water-heater.html

Serial number decoder:
http://waterheatertimer.org/pdf/WaterHeaterSerialNumberDecoder.pdf
For example Rheem serial number 0790...
First 2 digits are month 07 July
Next two digits are year 1990

Rheem site does not show 81v40d
http://www.rheem.com/products/tank_water_heaters/electric_water_heaters/

Serial number should be on label on side of tank.
Labels contain information like model number, tank capacity and BTUs
First 4 digits of serial number are date of manufacture: for example 0604 is June 2004
Take photo of label for easy reading and for your records

http://www.rheem.com/products/tank_water_heaters/gas_water_heaters/

Label for Craftmaster Gas 30 gallon:

About the only device in that heater that could cause the noise you describe is an electrically operated valve that controls water flow. Rheem is a better-than-average company so I would give them a call and describe your problem to them; I'll bet that they will be glad to tell you which part you need and supply it to you.
We had a heat pump system from Rheem that needed only the replacement of one large relay and the outside unit fan motor during more than 25 years of service and is still operating at age 30 in our former home.