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Old 10-31-2009, 01:18 PM   #1
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Its now or never...decisions (Two questions)


We would like to consider hot water recirculation/pump. I dont think we will be installing anything after construction. What we have is new construction and will be having a concrete slab poured. The supply (PEX) lines will be ran under the slab through a chase pipe. The reason for the chase pipe is overkill for most but simply for any unforeseen reason the pipe needs to be removed then it can be and another piece can be slid back in place. The cost to install the chase pipe to me and my plumber is very minimal. (1st) I was thinking of asking my plumber to install TWO chase pipes because if we was to have hot water recirculating pump installed then the cold really needs to be separated from the hot supply pipe...right ? Well even if this is not true or necessary then my main concern is to (2nd) ask if it is cost effective to have the recirculating system installed as we understand the cheapest way to get it is through new construction installation and not retrofitting later.
Right now the measurements (measurements mentioned are straight shot and do not include bend and/or the total length of the actual route) from the hot water heater to the furthest fixture in master bath is around 12'. Furthest in guest bath is around 18'. and kitchen sink (our most used, hand washing etc...) is 25'. We have two boys that are 13 and 10 years old. We project the house to be finished in around 1 to 2 years.
We want the hot water recirculating but do you think its worth it ? Its now or never as far as Im thinking. Help with thoughts and/or suggestions.

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Old 10-31-2009, 02:13 PM   #2
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Its now or never...decisions (Two questions)


Quote:
Originally Posted by Mudball View Post
We want the hot water recirculating but do you think its worth it ? Its now or never as far as Im thinking. Help with thoughts and/or suggestions.
What would I have to pay you each month not to have recirculation, such that you are completely indifferent to receiving payment or having the pump(s)?

Compare this with the bid price and the comfort you would have or lose, plus the maintenance on the pump(s). Also, there are probably heat loss calcs. on the Web for recirculating vs. none.
100' of 1/2" ID pipe contains 1 gal of water, if I remember correctly so you can figure how much cold water you'd have to put up with.

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Old 10-31-2009, 03:24 PM   #3
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Its now or never...decisions (Two questions)


If you really think you need a circulating pump, go with the switch type. When you are going to use hot water, you flip a switch and it turns the pump on. This way you eliminate a constantly running pump. I have seen this type installed and there is a push button switch at each fixture.
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Old 10-31-2009, 08:07 PM   #4
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Its now or never...decisions (Two questions)


Thanks for all the help. I will keep your suggestions in mind and do more research.
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