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Question DetailsAsked on 8/19/2015

Experienced and cost effective plumber to install a re-circulation pump on hot water line eliminating water waste.

pump sends "cooled off hot water" at end of hot water service line back to water heater via cold water line where water is re-heated instead of going down the drain. This simple application makes hot water delivery more effective, lessens waste of water waiting for hot and usually has a timer so only in use during peak hours. Key is having quick hot water on demand without waste of running water down drain until it reaches desired temperature.

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Unless you want your "cold" water to actually be warm to hot, and possibly taste bad due to the "cold" water having been through the water heater, the return side of the loop is almost always dedicated to the circulating hot water only - meaning you actually have 3 pipes running at least from the incoming/water heater area to the demand points or close by - cold water feed, hot water feed, and hot water recirculation back to the water heater; so putting this type of system in, done correctly, requires putting in another pipe run to or near to (commonly run to the room area, not to each individual faucet) for the return.

Here are links to a couple of prior similar questions with some info on costs and circulating pump brand names -

Answered 4 years ago by LCD

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