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I have a Hoyt Water heater. The serial # is A87RNH1373190,and the model # is A40HM. Can anyone help me determine the age of the heater?

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SOURCE: Age of MW Water Heater

mfr date 10/87

Posted on May 24, 2009

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SOURCE: I need to find out the year of manufacture of my

Posted on Sep 16, 2010

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How to determine the length of a rheem water heater ?

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


Aug 27, 2014 | Water Heaters

1 Answer

Date of manufacture 81v400, serial r1194849014

1) Rheem 81V40 electric water heater ... manufactured pre 2009 ... posted serial number does not match manufacturer page 5

2) Possible date of manufacture 11-1994

Mar 05, 2013 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

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How do I determine the age of my unit? it is a Rheem water heater model 81V-80D

call plumbing supply house with serial #, & model #of your tank. give them the info and if they handle the brand of your tank , they should be able to help.

Dec 27, 2011 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

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"kenmore 153335450 not sure when

You have water visible on outside of tank?
TP temperature-pressure valve is probably releasing water.

Age of water heater is determined by alpha-numeric serial number on label on side of tank.
Look at second two digits: On older kenmore for example C05.., was made in 2005

Aug 23, 2011 | Rheem 80 GAL ELEC TALL Water Heater 6YR SC...

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When was this model built?

You posted under water heaters.

Following information is for tank-type water heaters both gas and electric.
Look at label on side of tank.
You will see type and rating of water heater.
You can also see brand and serial number.

Serial number has date of manufacture, but each brand is different.
Open following chart to determine age of your specific water heater:

Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, expert speaks with you over phone while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

Feb 08, 2011 | Water Heaters

1 Answer

My heater is not getting hot i can not tell if their is a pilot light or a reset button i don know what to do with the heater it is very different how can i heat my water heater

Reliance makes gas and electric water heaters.

Best way to start is to look at label on side of tank.
Label has serial number, model number, plus it will say if heater is gas or electric.
Reliance water heater age is shown in serial number: first digit is letter, second two digits are numbers: for example numbers 02 would be the year 2002.
If water heater is 8-12 years old, it might be time to consider new tank.

Gas water heater has 3 inch metal flue pipe coming out of top of tank.
Gas pilot is probably off.
Relight pilot light: Most gas water heaters today have instructions on side of tank just above gas valve that say how to relight pilot light. Instructions vary by model.
If you have gas water heater that is older, it might be easier to call a plumber.

Electric water heater has panels on front.
Open top panel and push in red reset button.
If you have electric water heater of any age, you can usually fix it yourself same day:


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