Forum Title: Takes too long to get hot water at kitchen sink!
I recently repiped my house with pex due to a slab leak. For the fifty foot run to the kitchen, I used 3/4" pex, and it takes 90 seconds to get hot water at the sink faucet (this is an improvement from before when it took 135 seconds!). Since the faucet intake lines are ¼” copper (Price Pfister faucet, gives lousy water volume!), it seems to me that the 3/4" line is way overkill and actually makes it take way longer to go from cold to hot, right? I measured the inside radius of the 3/4" and the 1/2" pex (about 5/16” and 15/64”, respectively) and calculated the volume of cubic inches that my fifty foot feeder line holds, 184.08 cubic inches, would decrease to 103.54 cubic inches which is 56% of the current volume. So my question is: If I replace the 3/4" pex with 1/2" , will the time to get hot water at the faucet decrease 56% to about 50 seconds? And if this is true, would I be even better off going with 3/8" pex for the 50 foot run from the hot water heater to my kitchen sink? This is a direct run and the only things it feeds are the kitchen sink and the dishwasher, so pressure drop doesn’t seem to be an issue… Thanks in advance for your advice!
Category: Plumber Post By: KATHLEEN SCOTT (Bossier City, LA), 04/23/2016

I know about recirculating pumps but I prefer low tech solutions...

- BRANDON GOMEZ (Campbell, CA), 09/11/2017

Install one of these

- NELSON MARQUEZ (Burbank, CA), 09/16/2017

^ This is what I have in my current house and my water is nearly instantly hot.

- DARRYL HALE (Flagstaff, AZ), 10/07/2017

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