Is one way better than the other way
- Thread starter DIY
- Start date
Users who are viewing this thread
Depends on the demand on the line and how long the 1/2 line is. Increasing the diameter of pipe will only reduce friction loss.
Water pipe sizing
Water pipe sizing
Last edited by a moderator:
Sponsor
Paid Advertisement
Kitchen sink with swivel handle hot/cold faucet.tub/shower Hot / diverter valve / Cold , Toilet , lavatory sink Hot / Cold. The 1/2" hot side line would take a few turns,but it will be 20' in total length. From the water heater exists @ 1 1/2 to 2' of 3/4" piping.
Jimbo
Plumber
Increasing pipe size will minimize any further friction PSI loss based on GPM flow. Decreasing the pipe size will increase friction loss at a given GPM
Cacher_Chick
Test, Don't Guess!
Don't overlook that by running 3/4" you will need to move a lot more water waiting for the HOT to arrive from the water heater.
Thank you all,Winslow,jimbo and cacher_chick
So, if 3/4" piping is used for all 20' of hot line there will be better water volume. If 1/2" piping is used for all 20' of the hot line it creates a bit less volume,but more pressure.Ok. I can live with less volume,for more pressure if that gets the hot water to any 1 of these fixtures at a time.( kitchen sink,tub/shower,lavatory sink) in a reasonable turn of the handle on,or under a few seconds?
So, if 3/4" piping is used for all 20' of hot line there will be better water volume. If 1/2" piping is used for all 20' of the hot line it creates a bit less volume,but more pressure.Ok. I can live with less volume,for more pressure if that gets the hot water to any 1 of these fixtures at a time.( kitchen sink,tub/shower,lavatory sink) in a reasonable turn of the handle on,or under a few seconds?
hj
Master Plumber
- Messages
- 33,603
- Reaction score
- 1,042
- Points
- 113
- Location
- Cave Creek, Arizona
- Website
- www.terrylove.com
Volume is a function of pressure. A long 1/2" line will reduce BOTH volume and pressure. A 3/4 line has less pressure loss so it will give more volume. The hot water will get to the faucet sooner because a 1/2" line holds about 1/2 the amount a 3/4 line does so you have to evacuate less cooled water. All the dynamics are interrelated so you have to decide which parameter is more important to you.
Jimbo
Plumber
20' is a pretty short piece of pipe, and you would not likely notice the pressure difference, or the time to get hot water, either way.
Hi all,
I do not want to beat this post into the ground,but future plans for this place make it important. Hj the parameters that would be important to me would be hot water that one would not have to wait for at the faucet that would waste less than a half gallon, half gallon or more of water for,no need for a reckrculation pump (i think this short 20run of piping can be solved via the right size pipe..? There is always just testing to see the difference the two pipe sizes would make....hmmm cpvc too...
Thanks to all and the plumbers & master plumbers!
I do not want to beat this post into the ground,but future plans for this place make it important. Hj the parameters that would be important to me would be hot water that one would not have to wait for at the faucet that would waste less than a half gallon, half gallon or more of water for,no need for a reckrculation pump (i think this short 20run of piping can be solved via the right size pipe..? There is always just testing to see the difference the two pipe sizes would make....hmmm cpvc too...
Thanks to all and the plumbers & master plumbers!
hj
Master Plumber
- Messages
- 33,603
- Reaction score
- 1,042
- Points
- 113
- Location
- Cave Creek, Arizona
- Website
- www.terrylove.com
1/2" CPVC alters the parameter drasically, since it has about 1/2 the capacity of copper tubing.
I know volumes and pressures can be pretty amazing depending on the space they have to travel through,but the difference here seems pretty min ute to me? Maybe that is a drastic change to effect the flow and/or pressure?
The copper and CPVC I have here measures the following ID:
1/2" copper piping type "L" is just shy of 9/16"
1/2" CPVC piping type "Flowguard Gold" is right at 1/2"
The copper and CPVC I have here measures the following ID:
1/2" copper piping type "L" is just shy of 9/16"
1/2" CPVC piping type "Flowguard Gold" is right at 1/2"
