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Old 04-14-2012, 10:22 PM   #1
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water heater question


OK, in the interest of 'Full Disclosure' I am a GC. My training is as a carpenter, but I did a 2 year plumbing apprenticeship about 25 years ago. Don't shoot me for a dumb question!

I helped a friend by fixing his Bradford White water heater. A 40 gallon natural gas unit. It turned out that the high temperature limit switch that is flush mounted to the combustion chamber access door was bad. I replaced it and everything is working as it should. So far, so good.

My dumb question is: what is it there for? Why monitor the heat in the combustion chamber? Won't the T-stat turn off the burner. Is it a redundant safety feature in case the T-stat fails? Do all water heaters have this feature, just mounted out of sight?

This is just to satisfy my personal curiosity.

TIA Guys.

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Old 04-15-2012, 10:24 AM   #2
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water heater question


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Originally Posted by Chuck Kiser View Post
OK, in the interest of 'Full Disclosure' I am a GC. My training is as a carpenter, but I did a 2 year plumbing apprenticeship about 25 years ago. Don't shoot me for a dumb question!

I helped a friend by fixing his Bradford White water heater. A 40 gallon natural gas unit. It turned out that the high temperature limit switch that is flush mounted to the combustion chamber access door was bad. I replaced it and everything is working as it should. So far, so good.

My dumb question is: what is it there for? Why monitor the heat in the combustion chamber? Won't the T-stat turn off the burner. Is it a redundant safety feature in case the T-stat fails? Do all water heaters have this feature, just mounted out of sight?

This is just to satisfy my personal curiosity.

TIA Guys.
Ayuh,... Donno Chuck, but I'll bump this up, just to see an answer to the question....

I'd think it's a Safety feature, but don't know....

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Old 04-15-2012, 09:18 PM   #3
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water heater question


Quote:
Originally Posted by Chuck Kiser View Post
OK, in the interest of 'Full Disclosure' I am a GC. My training is as a carpenter, but I did a 2 year plumbing apprenticeship about 25 years ago. Don't shoot me for a dumb question!

I helped a friend by fixing his Bradford White water heater. A 40 gallon natural gas unit. It turned out that the high temperature limit switch that is flush mounted to the combustion chamber access door was bad. I replaced it and everything is working as it should. So far, so good.

My dumb question is: what is it there for? Why monitor the heat in the combustion chamber? Won't the T-stat turn off the burner. Is it a redundant safety feature in case the T-stat fails? Do all water heaters have this feature, just mounted out of sight?

This is just to satisfy my personal curiosity.

TIA Guys.
by t stat i think you mean control valve...to answer your question...NO... safty switch monitors inside chamber for heat from blocked vent...t stat as you call it..measures inside tank..water temp...
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