Question: The electric water heater may be more modern than the gas water heater, but those homeowners who understand the value of a dollar are aware that using electricity to heat water costs almost three times as much as it does to use gas.

1. than the gas water heater, but those homeowners who understand the value of a dollar are aware that using electricity to heat water costs almost three times as much as it does to use gas.
2. than the gas water heater, but those homeowners who understand the value of a dollar are aware that using electricity to heat water costs almost three times as much as using gas.
3. than the gas water heater, but those homeowners who understand the value of a dollar are aware that to use electricity to heat water costs almost three times as much as to use gas.
4. than the gas water heater, but those homeowners who understand the value of a dollar are aware that using electricity to heat water costs almost three times as much as using gas does.
5. than the gas water heater, but those homeowners who understand the value of a dollar are aware that using electricity costs almost three times as much as using gas to heat water.

Correct Answer: D
Explanation: Choice D is awkward but best fits the answer. The verb at the end takes the place of the verb costs from earlier in the comparison. It fixes the original comparison error by comparing using electricity…costs to using gas does and introduces no new errors. Let's take a look at the other options mentioned.

Option A
than the gas water heater, but those homeowners who understand the value of a dollar are aware that using electricity to heat water costs almost three times as much as it does to use gas.- Incorrect. Contains parallelism error. Using electricity costs incorrectly compared to using gas.

Option B
than the gas water heater, but those homeowners who understand the value of a dollar are aware that using electricity to heat water costs almost three times as much as using gas.- Incorrect. Because there is no verb attached to the phrase using gas, Choice B compares how much it costs to heat water using electricity. With using gas itself; the phrase using gas needs a verb to parallel costs from earlier in the comparison. Therefore it can be eliminated.

Option C
than the gas water heater, but those homeowners who understand the value of a dollar are aware that to use electricity to heat water costs almost three times as much as to use gas.- Incorrect. This choice can be eliminated because it has a similar problem to choice B. Though the sentence makes use of infinitive verbs (to + verb) rather than gerund phrases. The comparison is still between how much it costs to heat water using electricity and using gas itself.

Option E
than the gas water heater, but those homeowners who understand the value of a dollar are aware that using electricity costs almost three times as much as using gas to heat water.- Incorrect. This choice compares how much it costs to use electricity with using gas to heat water. The notion of cost has been lost in the second half of the comparison, rendering the sentence nonparallel.

“The electric water heater may be more modern than the gas water heater”- is a GMAT sentence correction question. These sorts of questions come up with grammatical errors in the underlined part of the sentence. The candidates need to select the correct statement given in the options. The GMAT sentence correction section demands good skills in grammar since the candidate has to identify common grammatical errors. GMAT sentence correction is a part of GMAT verbal.

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