Differenece between Andersen 737 and 837

A quick learner from North Haven says:
March 11, 2019
Hi can you please tell me the difference between the 737 and the 837 anderson window balancer parts? I believe my window to be a anderson narroline 3032 since the glass size of each the top & bottom sash is approx 15 14/16 inches height and 32 7/16 with. However it is unclear if the balancer is the 737 or the 837. Thank you.
Profile picture of Bob
Bob from SWISCO responded:
March 11, 2019

Thanks for posting. The 24-737 and 24-837 have different strength ratings. The only way we can recommend one over the other with high confidence is to see the stamped codes on your original balance box. One of these stamps should indicate which balance you need. It is the only way to know for sure. If you can provide us pictures of all the stamps on your original balance, we'll go from there.
Profile picture of Bob
Bob from SWISCO responded:
March 11, 2019

If there is a stamp of '725' on the old balance box, then it can be replaced by the 24-737. 
A quick learner from North Haven says:
March 11, 2019
the stamp on the original balancer is 725.
A quick learner from North Haven says:
March 11, 2019
thank you for the info!
Profile picture of Bob
Bob from SWISCO responded:
March 12, 2019

My pleasure. Let us know if you need anything else!
Andersen Sash Balance, 725, 727, 731, 737
Andersen Sash Balance, 725, 727, 731, 737
24-737
$54.20
Andersen Sash Balance, 823, 827, 831, 837
Andersen Sash Balance, 823, 827, 831, 837
24-837
$54.20
How to replace an Andersen Window Balance
How to replace an Andersen Window Balance
VIDEO
WATCH >
Andersen's Narroline Sash Balances
Andersen's Narroline Sash Balances
GUIDE
READ >
Reply to Thread
Use this form to ask a follow-up question or to share your experience regarding this subject.
(your email address will be kept private and is only used to inform you when a response has been made)
Current wait time is 3-4 business days
We promise that one of our experts will personally get back to you as soon as they are able. Thank you very much for your patience and understanding. If your inquiry is time-sensitive, please feel free to reach us at (888) 991-1929 or at help@swisco.com.