Hot Water Heater Bad? - Plumbing - DIY Home Improvement | DIYChatroom

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


Thread Tools Display Modes
Old 01-18-2009, 02:12 PM   #1
Join Date: Oct 2008
Location: New Jersey, USA
Posts: 1,402
Rewards Points: 900

Hot water heater bad?

We have a 10yr old gas hot water (tank) heater. Lately, it seems that we are not getting enough hot water from it.
Today, I opened the drain cock at the bottom of the tank and let out some water. It ran pretty clear, but very hot.
As I recall, the cold water inlet tube is supposed to deliver cold water to the very bottom of the tank, therefore the water I get from that tap at the bottom is supposed to be only luke warm.
So, possibly the cold water inlet tube is cracked or broken.

Am I correct in saying that I should be getting luke-warm water from the bottom tap?





Last edited by Ultrarunner2017; 01-18-2009 at 02:17 PM.
Ultrarunner2017 is offline   Reply With Quote
Old 01-18-2009, 04:16 PM   #2
Join Date: Jan 2009
Location: Long Island
Posts: 348
Rewards Points: 250

should be whatever the water temp is set to imo.


II Weeks is offline   Reply With Quote
Old 01-18-2009, 06:22 PM   #3
Don't know it all, yet!
Join Date: Jun 2008
Location: Metro Atlanta, GA
Posts: 910
Rewards Points: 500

Assuming that it has been on for a while, it all should be the same (hot) temperature or you wouldn't have 40, 50 or whatever gallons of hot water. If I understand correctly, a water heater does fill from the bottom, as you stated and the hot water leaves from the top. There is a valve of some sort as explained to me years ago that keeps them from mixing while filling. That is how you can take a long shower that stays hot.

Having said that, I would expect that if you ran a shower, then drained some off immediately afterwards as it was refilling and heating another tank full, then you probably would get less than hot water.

I'm not a plumber though, I just fix a lot of stuff. Maybe someone else can verify this.
If it's worth doing, it's worth doing right. If you wouldn't put your name on it, it ain't done right!
downunder is offline   Reply With Quote
Old 01-18-2009, 06:51 PM   #4
biggles's Avatar
Join Date: Jan 2008
Location: Long Island
Posts: 3,630
Rewards Points: 2,000

the cold water feed opens up into the tank from the top the rod should be on the hot water line out of the HWH.the drain off should be the tank temp and sameclose to the nearest sink hot water.
biggles is offline   Reply With Quote
Old 01-18-2009, 07:01 PM   #5
Idiot Emeritus
Join Date: Mar 2008
Location: Fernley, Nevada (near Reno)
Posts: 1,849
Rewards Points: 1,492

Most water heaters have a 'dip tube' in them. It is inside of the cold water inlet. Its purpose is to take the cold water that flows into the tank down to the bottom of the tank.

If it is missing, you'll get hot water at any faucet, shower, etc., for a short time. It will turn cold in just a few minutes.

If it is intact, you'll get hot water from the tank drain for just a few minutes, then it'll turn cold. If it is missing, the water will stay hot from the tank drain for a long time.

It sounds to me like this is your problem.

Turn the cold water supply to the tank off, bleed the pressure down, and remove the cold water inlet to the tank. The dip tube is usually plastic, with the top end flared out so it sits at the bottom of the threads of the inlet fitting. Just because the flared end is in the tank fitting doesn't mean the rest of it is there as well.

They're sort of hard to get out, usually if you jamb a finger into it, and pull straight up, it'll come out. It's not threaded in, it just sits there. It goes to almost the bottom of the tank.

It's pretty rare to have one fail, but it does happen.

micromind is offline   Reply With Quote
Old 01-18-2009, 07:46 PM   #6
Join Date: Oct 2008
Location: New Jersey, USA
Posts: 1,402
Rewards Points: 900

I'm a bit confused about what is being said about the tank filling. I thought that the tank started to fill as soon as hot water is required. What else would push the hot water out of the tank?
Shouldn't the pressure in the tank be the same as the cold water pressure in the house?




Ultrarunner2017 is offline   Reply With Quote

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
Low hot water pressure crebive Plumbing 38 02-26-2013 12:26 AM
Low Hot Water Pressure btennant Plumbing 4 12-09-2008 09:31 PM
Insane water pressure in shower!!! Sarah24 Plumbing 5 12-09-2008 05:27 AM
Electric Water Heater GTSRider Plumbing 31 12-07-2008 11:30 AM
Water Heater tsmith Plumbing 10 12-01-2008 06:24 PM

Top of Page | View New Posts


Search Engine Friendly URLs by vBSEO 3.6.1