Hot Water Pressure Is 57% Less Than Cold On New Water Heater - Plumbing - DIY Home Improvement | DIYChatroom


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Plumbing

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Display Modes
Old 03-06-2012, 11:51 AM   #1
Newbie
 
Join Date: Mar 2012
Posts: 3
Rewards Points: 10
Default

hot water pressure is 57% less than cold on new water heater


new replacement water heater has less pressure, could I have a faulty water heater? I checked GPM at 3/4 discharge hot 6.16 & cold 10.68 at the tub faucet hot 2.8 cold 4.8. After the new install, if any hot water faucet is turned on the shower goes cold. Did not have this issue with the original water heater, is this a bad unit?

Advertisement


Last edited by wdgates; 03-06-2012 at 12:01 PM.
wdgates is offline   Reply With Quote
Old 03-06-2012, 11:55 AM   #2
Member
 
Join Date: Nov 2011
Location: Hartfield VA
Posts: 27,785
Rewards Points: 686
Default

hot water pressure is 57% less than cold on new water heater


Hmm, very little info. no pictures.
What other plumbing did they do when installing it?
Where are you checking the flow.
100% sure the valves are fully open that someone had to shut off to change the heater.
What type valves are they?
Why was the heater changed?

Advertisement

joecaption is offline   Reply With Quote
Old 03-06-2012, 12:22 PM   #3
Newbie
 
Join Date: Mar 2012
Posts: 3
Rewards Points: 10
Default

hot water pressure is 57% less than cold on new water heater


I replaced a bradford white direct vent (22yrs installed) with a Powerflex direct vent. I measured GPM from two 3/4 copper pipes that was used to feed a temp kitchen down the basement and also in the bathroom tub faucet. I did three test bucket fills and the avg has been posted for the hot & cold at each location. No other work was done.

Last edited by wdgates; 03-06-2012 at 12:30 PM. Reason: brand change from american standard to powerflex
wdgates is offline   Reply With Quote
Old 03-06-2012, 12:27 PM   #4
Member
 
Join Date: Nov 2011
Location: Hartfield VA
Posts: 27,785
Rewards Points: 686
Default

hot water pressure is 57% less than cold on new water heater


More likly there's trash in the shower valve and the anti scald valve inside the control.
Very common to happen after major plumbing work.
joecaption is offline   Reply With Quote
Old 03-06-2012, 12:35 PM   #5
Newbie
 
Join Date: Mar 2012
Posts: 3
Rewards Points: 10
Default

hot water pressure is 57% less than cold on new water heater


I'm showing the same % reduction of pressure straight out of the 3/4 pipe as the tub faucet. Should the hot & cold have the same pressure?
wdgates is offline   Reply With Quote
Old 03-06-2012, 07:41 PM   #6
Member
 
Join Date: Oct 2011
Location: pa
Posts: 4,645
Rewards Points: 2,604
Default

hot water pressure is 57% less than cold on new water heater


Quote:
Originally Posted by wdgates View Post
I'm showing the same % reduction of pressure straight out of the 3/4 pipe as the tub faucet. Should the hot & cold have the same pressure?
did the shut off valve to water heater get damaged by shuting off??
ben's plumbing is offline   Reply With Quote
Old 03-06-2012, 07:46 PM   #7
Member
 
Join Date: Nov 2011
Location: Hartfield VA
Posts: 27,785
Rewards Points: 686
Default

hot water pressure is 57% less than cold on new water heater


If it's an old style gate or globe valve and not a ball valve sometimes the shafts inside can wring off inside the valve from being stuck from have not been moved for a ling time.
The handle will still turn but the inside part does not move.
One sign can be the handle turns and turns and never comes up againt a stop.

Advertisement

joecaption is offline   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Pressure drop across water heater, low hot water flow HVAC_NW Plumbing 2 01-17-2011 11:43 PM
Cold water is warm - hot water leak under slab? Homerepairguy Plumbing 9 10-13-2010 09:17 PM
Testing 12 year old hot water expansion tank? DJfixer Plumbing 2 01-01-2009 09:09 AM
Low Hot Water Pressure btennant Plumbing 4 12-09-2008 10:31 PM
New Water Heater, worse pressure Repoman75 Plumbing 6 04-16-2005 12:30 AM




Top of Page | View New Posts