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chris singleton Posted on Jul 09, 2019
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I recently put a new gas water heater in my house and after plumbing all the lines and setting it up I noticed in my kitchen sink that I lost a lot of pressure only on the hot water side. All the other faucets are OK. What could cause this issue? I took off the faucet head but that’s not the issue as it is only low pressure on the hot side.

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storm88

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  • Contributor 7 Answers
  • Posted on Aug 17, 2019
storm88
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Being it’s only on the hot side in the kitchen, that typically would indicate some of the buildup inside the pipes (water lines build up stuff inside of them over time) came loose (happens when you shut water off then repressurize) and is blocking it up somewhere.

Take the supply off the faucet and put it into a 5 gallon bucket, open it up and see how much pressure there is. If its decent (compare the cold side if unsure) backflush the facet by simply leaving the hot supply connected to the faucet and not the stop pointing into the bucket, turn the cold on at the faucet, it should force its way out of the hot supply instead of the faucet itself, if this is making sense.

If you have bad pressure at the stop by just removing the supply from the faucet and testing you can try to shock the blockage out by leaving the supply in the bucket and using the heater shut off to pressurize/depressurize the line while it’s open, sometimes that’s enough to blow it out, follow the line to the kitchen and tap on it with something to help knock the stuff out. If you can’t get it out, you’re looking at replacing the kitchen feed line. Most of the time you can get the blockage out, but they can be VERY stubborn.

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  • Expert 258 Answers
  • Posted on Aug 06, 2019
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There should be a valve on the outlet and inlet side of the water heater. Make sure they are fully open.

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5 Related Answers

Anonymous

  • 1 Answer
  • Posted on Nov 29, 2008

SOURCE: Water is either hot or cold - no in between.

I found a way to get warm water in the shower, but I'm not sure it qualifies as a solution. After trying everything else I thought that maybe when I was feathering the faucet in the shower toward the cold side so I would get warm water that at a certain point it blocked the flow on the hot water side enough so that the sensor in the hot water heater sensed there was no demand in the line and it shut the water heater off. To test this, I went to the kitchen and turned the kitchen sink faucet all the way to the hot side and then turned it on so that I got a small flow of water. I waited for the water to get hot to be sure the hot water heater was working. Once it was hot, I left it running to keep demand in the line and then I went to the shower and turned the faucet on. When the water got hot I started feathering the control towards the cold side and soon I had warm water. So I think I'm right in that the sensor in the hot water heater was shutting the water heater off when the demand in the shower was lowered to a certain point when I was trying to adjust the water temp in the shower.

So now I can get warm water, but it means I have to leave the hot water running at another fixture in the house to create a false demand in the system so the hot water heater doesn't shut down. Is there a way to adjust the senor in the hot water heater so that it will stay on when I'm using the shower only, so I don't have to waste water by running another faucet when I want to take a shower?

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arealplumber

Better Plumbing

  • 33 Answers
  • Posted on Dec 05, 2008

SOURCE: Loss of pressure in kitchen faucet - Price Pfister

Your problem is a simple one.

  1. Turn off water to faucet.
  2. Place a towel(s) in the base of the sink(s) to prevent any parts from going down drain.
  3. Remove the handle to the faucet. (single handle only)
  4. If not a single handle then remove spout from faucet.
  5. If a single handle remove cap carefully and any loose parts.
  6. Gently turn spout side to side while lifting to remove.
  7. You will see a hole with a very small valve where the water comes out to the spout on the base of the faucet.
c262d3c.jpg
  1. Remove this valve (which is a backflow preventer) and replace.
  2. Reassemble and test.
Problem solved.

arealplumber

Better Plumbing

  • 33 Answers
  • Posted on Dec 05, 2008

SOURCE: low pressure and flow on hot water side of single handle faucet

It could be one of two problems, one simple, one serious.

  • Easy fix
  1. Turn off hot water angle stop under sink to faucet.
  2. Remove supply line from hot angle stop.
  3. Place end of supply line in a small bucket to catch some water.
  4. Turn on cold water for a couple of seconds and backflush debris from faucet.
  5. Reconnect supply line.
  6. Turn on angle stop and test
  • Complex fix
If you have steel pipes you may be experiencing reduced flow due to corrosion in your pipes. Reduced hot water pressure in the kitchen faucet is usually the first sign since this is the faucet that is most used in the home.

Repiping is a job for a professional. Another symptom you may need a repipe is orange colored or rusty water.

Anonymous

  • 1 Answer
  • Posted on Feb 17, 2009

SOURCE: Low Water Pressure in Kitchen Faucet

Ihad the same problem. It is not the screen. What you need to do is get a spray diverter the old one disintergated and is blocking the flow. You have to take the collar off and underneath is the diverter. This is after you take the ball and rings out.

Anonymous

  • 146 Answers
  • Posted on Jun 26, 2009

SOURCE: Delta single handle faucet. Hot or cold no in between.

well they should be same size but unless you getting more of one then other then sound like mixing valve is not mixing. do have 3/4 hook up to mixing valve? you only need 1/2" to valve.

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Low water (hot and old) pressure in kitchen

Following link has troubleshoot walk-thru:
http://waterheatertimer.org/Low-water-pressure.html

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

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Is this the only faucet exhibiting this problem? If so, you'll probably need to disconnect the lead-in lines under the sink and then open the shut-off valves to clear them. If more than one faucet is messed up, your water heater (or a whole-house water filter, if you have one) may be plugged. Check your heater manual for flushing procedures; then change the whole-house filter.
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I have the exact same problem, house is only 6 years old, two handel faucet, Ive turned off the cold side to eliminate it, turn on hot and have to run at full blast and it takes a full 10 minutes to get to...

You have a clog in the water line?
Or a faulty check valve or mixing valve?

Add a comment and say how you fixed the problem, or add more information about size of pipes.
It seems like the cold water is getting into the hot water line somehow. There is no other explanation, as much as I can see from 800+ miles away.
If you have crossover on a single-handled faucet where the cartridge is bad, that can cause this problem.
Slab house can have plumbing in attic. It can be a chore to drop poly pipe down into walls, but it can be done with angle drill. Assuming walls are 8 foot high and pipes can be easily dropped to sink level where the sheetrock is removed and new pipes tied into sinks and tubs.
This kind of DIY project would take a couple weeks working a few hours each night when temps cool off, depending on size of house and number of affected faucets.
I live in Houston on a slab and ran my pipes in the attic when I built the house. Of course I worry about broken pipes collapsing the ceiling and filling the house with water, which happened to lots of homes one year when temps dropped to 4 below. I was in the painting business at that time, which was a boon to business for a few weeks.

Upvote the help.
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First it takes over two minutes to get hot water 30 feet away. Then when it's finally hot and adjusted to a comfortable setting in the shower, it only lasts maybe 3 minutes. And in the same room, the...

If the unit is functioning properly, then you need to contact your utility company to see about upgrading the size of the gas line and meter to your house, and possibly the lines IN th house. It may be cheaper to go back to a tank type water heater despite the potential energy savings with a tankless.
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