Thread: BTU Rating of a 30-gallon Water Heater

Hi:

Does anyon know the typical BTU input rating of a basic 30-gallon gas fired water heater?

Thanks,
Joe

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If you gave us a brand name we could look it up.

Disclaimer: I am not a plumber, not even a scientist.

Originally Posted by John Kogel

If you gave us a brand name we could look it up.

Disclaimer: I am not a plumber, not even a scientist.

Hi:

The water heater in question is a Bradford-White gas fired water heater.
23 years old.

31,000 btu's

I think ???

31,000 sounds close to me.

The IFGC Table 402.2 says to figure 35,000 for approximate gas input for a 30-40 gallon water heater.

Why would you need to know the BTU input on a 23 y/o DHW heater? It should be replaced and that would mean probably moving up to a 40/40. Are you checking on liner sizing, gas piping, or makeup air calculations?

Here is a label from a 30gal Natural Gas I found last week.