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Green Plumbing

Category - Solar Hot Water

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In a retrofit two-tank installation of a solar heated water system, what is the recommended age above which the existing tank should be replaced?

Three years
Five years
Eight years
Eleven years

Explanation

Answer: B - It is recommended that existing tanks be replaced during the retrofit if they are more than five years old. Given the limited useful life of water heater tanks, keeping an older tank as part of a new retrofit for solar increases the likelihood that the backup (existing) tank will fail relative soon after the retrofit is completed.

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