Need service manual for Bradford White water heater MITW50L6CX10 service manual so I can check/adjust ignitor/ignition controller.

SOURCE: noisy water heater blower

There really is no way to do this. If you put a cap you will restrict the air flow which will cause you to have problems with the water heater, same thing if you where to put screen on it. You can try enlarging the pipe to a 3 inch and see if that works. But 15 years in the trade nothing has been made to reduce the noise

SOURCE: How do you remove a tmp valve out of a propane gas

yes you can get a universal one at any hardware store[about 15$]. shut off cold valve at top of tank and drain tank through drain at bottom of tank.you only need to drain enough to get the water level below the t&p valve. you should use dope and teflon on the new threads of the valve to ensure no leaks. a big cresent wrench or pipe wrench will work to unscrew the valve in a counterclockwise direction

SOURCE: my fan on top of

Contact Bradford White and ask which blower is correct:
http://www.bradfordwhite.com/supportserv.asp

Get model number and serial number from label located on side of tank.
This information will help BW find exact information for your product.

SOURCE: I have a Bradford White

1) First suspects include Honeywell icon gas control valve, loose-or-bad wiring, and dirty burner parts.

2) MITW50L6CX10 blower number is 239-39785-00. Blower is working, but communication between blower and gas control valve are suspect.
Water heater has 6 year warranty
Water heater was manufactured January 1999.
http://www.bradfordwhite.com/findaserial.asp

3) Typical service manuals for M-1-TW-50 TTW series show how to test and replace Icon gas control.
Multimeter is required for testing.
Also shows how to clean burner parts and combustion chamber and air intake to catch up on regular maintenance.
http://www.bradfordwhite.com/images/shared/pdfs/manuals/46238-A.pdf
http://www.bradfordwhite.com/documentation/residential/gas.asp

4) Take a moment and rate answer:
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SOURCE: bradford-white water heater wont heat water.the

Water heater is not identified and gas valve is not known.
Review options below:

1) Add a comment and describe what gas control valve is on the water heater, and model number from label on side of unit. Include what you have tried so far.

2) Try unplugging water heater and see if water heater resets.
Disconnect blower from gas valve, then plug blower in to see it it operates.
This will eliminate or include blower as suspect.

3) Open following link to download service and product manuals to help troubleshoot exact model.
http://www.bradfordwhite.com/documentation/residential/gas.asp

4) Open following link to identify gas valve.
http://waterheatertimer.org/How-to-adjust-temperature-on-water-heater.html#intelli