3/4 pex to and from water heater?

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Old 11-02-17, 07:00 PM
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3/4 pex to and from water heater?

I plan to put 3 water heaters in a basement, 1 for each appartment of a building.
Is it better to use 3/4 pex for the connections and runs or just 1/2"?
Obviously one water heater will have a 30ft run up, the other a 20ft run and the other just 10ft or less.
 
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Old 11-03-17, 04:57 AM
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I run 3/4" trunk lines everywhere and T off with 1/2" to each fixture. There are 3/4" x 3/4" x 1/2" T fittings just for the job.

 
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Old 11-03-17, 11:53 AM
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If the current inlet or main pipes I can connect to a 1/2" am I always limited to that flow even if I put 3/4 in the lines after that?
not sure what normal house inlet size is.
 
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Old 11-03-17, 12:14 PM
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Are you asking about your water main size or the size of the fittings on a water heater?
 
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Old 11-03-17, 02:47 PM
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Both but if water main or main trunk are currently 1/2" then is there any benefit to heaters having 3/4 outlets?
 
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Old 11-03-17, 03:16 PM
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The larger diameter pipe will have less resistance to flow. So, when running water there will be less pressure drop. But I'm not sure you'd notice the difference if the supply to the house is 1/2". Still, I would go with 3/4 trunk lines just for the future. Some day the supply to the house will need to be replaced and when it is it will probably be 3/4" or 1". Then the house will be already for the increased flow.
 
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Old 11-09-17, 01:13 PM
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I think the supply to the house is 3/4 galvanized which splits into a 1/2" to the water heater. How do I cut galvanized pipe to insert a 3/4-3/4-3/4 tee?
 
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