Two hot water outlets

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Old 08-09-19, 03:31 PM
JOB
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Two hot water outlets

Hi, just down at my niece's new house.

She has a 50 gallon gas hot water heater. A cold input and hot output on the top of the tank.

A pressure relief valve .

A drain.

Here's the question the drain outlet is hooked into the hot water system (didn't trace where it went yet).

Why would a water heater, output from the designated hot outlet and the drain ?

Seems like all the crap at the bottom of the tank would be sent out into hot water system.

Whats the advantage ?

Thank You
JOB
 
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Old 08-09-19, 04:14 PM
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It sounds like there is a recirculating loop for the hot water system. The connection is made at the drain fitting and the hot water constantly flows thru the pipes so that hot water is always immediately available at the furthest point.. It could be a gravity flow or a small circulating pump.
 
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Old 08-09-19, 04:21 PM
JOB
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Thank PJmax for your quick reply. Whats your opinion of these recirculating loops ?

JOB
 
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Old 08-09-19, 05:38 PM
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If you have a large home with long pipe runs it's one way to get hot water to the last device on the loop quickly. However..... it doesn't come without a price. The water heater needs to keep all that water heated that is being circulated. You need to reduce the heat loss thru the pipe which means the entire hot water pipe should be insulated.
 
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Old 08-09-19, 06:11 PM
JOB
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Thanks again Pjmax appreciate your input

JOB
 
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Old 08-10-19, 04:01 AM
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A recirculating system is like having a radiator running all through your house. In winter it's not quite so bad as the escaping heat can warm the house. In summer you are paying to heat that water and then paying to run air conditioning to remove that very same heat. Then there is the electricity to keep the circulation pump running 24/7. On the plus side you do tend to conserve water since you don't have to let the water run until the hot water arrives.
 
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