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Old 07-06-2008, 03:23 PM   #1
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New Plumbing Now Hot Water Runs Out

Hi all,

Just redid the plumbing in my house, I have a well so I ran 1 inch copper from the well pressure tank to a manabloc system. From there I fed 3/4 inch Pex to the oil boiler domestic coil (it was originally 1/2 inch copper) and 3/4 inch Pex back to the manabloc. Feeds off the manabloc are 1/2 inch.

Before I was able to take a 30 minute shower without running out of hot water. Now the hot water runs out after only a few minutes. Becasue the domestic coils are heat on demand the only thing I can think of is that the 3/4 inch tubing is passing more water through then it can heat up reliably.

Is there any simple way to fix this?



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Old 07-07-2008, 09:21 AM   #2
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You need some type of flow control device on the outlet I think. On demand hot water heaters if you read up about them have limeted flow rates of ~ 5-8 GPM due to the same issue I believe you're talking about.


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Old 07-07-2008, 10:49 AM   #3
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You might try a water saver shower head. How do you take a 30 min. shower. Must be a big man or have company in the shower.
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