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pipe size

Posted by myaunza (My Page) on
Sat, Oct 16, 10 at 19:22

When my on demand hot water heater was installed the supply line 3/4 inch was reduced to 1/2 inch ,the output of the heater is 1/2 inch and then is brought back to 3/4 inch to supply the house. Should I replace the 3.4 with 1/2 after the heater or will this be ok as is? I have to open the lines as there is an obstruction between the heater and the kitchen. What kind of loss can I expect in pressure with the present setup, 1/2 to 3/4. The present set up is 1/2 to 3/4 to a Tee from the tee to the laundry tub the other output goes to a tee and this feeds the bath and kitchen. Pressure is great at the laundry tub but both the bath and kitchen seen low. It may be because of a obstruction but if the line was clear with one valve on at a time shouldn't all locations be the same?

Follow-Up Postings:

RE: pipe size

The 3/4" pipe will give you better flow rate (gallons per minute) than 1/2".
How are you measuring your water flow? Time how long it takes to fill the same container (1 to 2 gallons) at the various locations to see what differences there are.
What kind of obstruction do you suspect? There may be a slight reduction in flow rate from the number of tees and other turns it takes from the heater to the kitchen.

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