Obviously a model number would help, and I'm surprised one isn't visible if you go outside the TM and remove the cover over the water heater. But you could also approach it this way. Look under the kitchen sink. In current TMs, the water heater looks like a small barrel covered in white foam. Working from memory - help is solicited from anyone whose TM is open - the barrel is 14-16 inches long and 12 inches in diameter. It has a capacity of 6 gallons.
As ng2951 points out, the other possibility is 3 gallon capacity, which should be substantially smaller.
Hope this helps.
Bill
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