Recent Topics
Galaxy S8+ weird app when clearing storage
by KrisZ. 09/25/18 10:18 PM
Brake bleeder - cfm ?
by hallstevenson. 09/25/18 09:43 PM
18' Corolla vs 18' Elantra
by wolf_06. 09/25/18 09:41 PM
Using Tc-w3 bad for my car?
by Floydian. 09/25/18 09:25 PM
I'm going to start using type F in my gm autos
by turtlevette. 09/25/18 09:17 PM
Cleaning deceased MIL condo and found $15K cash
by Mr Nice. 09/25/18 09:12 PM
Gluten
by StevieC. 09/25/18 07:55 PM
Amazon Prime delivering inside your house
by StevieC. 09/25/18 07:49 PM
2018 MB C300 M1 0W-40 3,475 Miles
by 2015_PSD. 09/25/18 06:44 PM
02-05 Silverado frame rot
by Oildudeny. 09/25/18 06:38 PM
Aftermarket Back Up Camera
by lancerplayer. 09/25/18 06:20 PM
Service champ filter CUT OPEN
by 53' Stude. 09/25/18 05:05 PM
Pressure washer pump life just 23 hours?
by HawkeyeScott. 09/25/18 05:01 PM
STP S 10590 CUT OPEN
by 53' Stude. 09/25/18 05:00 PM
2003 BMW M5-Unknown oil 2500 mi
by Audios. 09/25/18 04:54 PM
FRAM ULTRA XG 3593A CUT OPEN
by 53' Stude. 09/25/18 04:51 PM
MG 201-7, 7,500 MILES CUT OPEN
by 53' Stude. 09/25/18 04:44 PM
MG 301-1, 10,800 miles CUT OPEN
by 53' Stude. 09/25/18 04:34 PM
Anyone regret their cordless electric OPE?
by dlundblad. 09/25/18 04:21 PM
Newest Members
Pat_Roberts, Peppz, Jfa02, ibsfusion, Fearcat707
66070 Registered Users
Who's Online Now
90 registered members (aquariuscsm, andrewp1998, 4WD, ABomb369, 2004tdigls, 2015_PSD, 7 invisible), 1,141 guests, and 37 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums67
Topics291,023
Posts4,854,591
Members66,070
Most Online3,590
Jan 24th, 2017
Donate to BITOG
Previous Thread
Next Thread
Print Thread
Hop To
gas water heater troubleshooting / replacement #4659128
02/07/18 02:57 PM
02/07/18 02:57 PM
Joined: May 2004
Posts: 1,311
Germantown, MD
greenjp Offline OP
greenjp  Offline OP
Joined: May 2004
Posts: 1,311
Germantown, MD
Howdy folks,
Our hot water heater lately hasn't been making the volume of water it did in the past. It's a 75 gallon Rheem. ~75k BTUs and if I recall correctly a recovery volume of ~68 gallons. Anyhow we have 3 adults, 3 kids, and a jacuzzi tub, and in the past there wasn't anything we could do that would exhaust the hot water supply. Showers, dishwasher, baths, washing machine, etc, it never ran out.
Now it does run out, especially when filling the jacuzzi. When it's hot it's as hot as usual. It seems to kick back on as you'd expect. There is a little bit of leaking from time to time from the drain spout.
The trick is this thing is 20 years old or so. I suspect that whatever the problem is, the real answer is probably "get a new one".
I've never done any maintenance or repairs on this thing and have never purchased a water heater before, so any thoughts would be appreciated. It's an "atmospheric" vent type and I do plan to stick with that, so don't need info on forced exhaust, tankless, etc.

jeff

Re: gas water heater troubleshooting / replacement [Re: greenjp] #4659138
02/07/18 03:03 PM
02/07/18 03:03 PM
Joined: Apr 2012
Posts: 5,167
MA
Wolf359 Offline
Wolf359  Offline
Joined: Apr 2012
Posts: 5,167
MA
They're pretty simple. The usual suspects would be to drain the tank, could be sediment on the bottom. Then it's possible it's the inlet water tube. Depending on where that breaks off, you'll start getting cold water instead of hot water. Cold water fills from top and hot water is at the bottom. If it breaks off near the top, you won't get that much hot water before you end up with cold water. You can replace the tube, but most people usually give up at that stage and just get a new one.

Re: gas water heater troubleshooting / replacement [Re: greenjp] #4659142
02/07/18 03:05 PM
02/07/18 03:05 PM
Joined: Jul 2003
Posts: 2,385
MN
tmorris1 Offline
tmorris1  Offline
Joined: Jul 2003
Posts: 2,385
MN
Probably a buildup of minerals and calcium inside which is making it less efficient. You are on borrowed time. Replace it before it bursts and floods your basement.

Re: gas water heater troubleshooting / replacement [Re: tmorris1] #4659156
02/07/18 03:17 PM
02/07/18 03:17 PM
Joined: Apr 2017
Posts: 431
Utah, USA
28oz Offline
28oz  Offline
Joined: Apr 2017
Posts: 431
Utah, USA
Originally Posted By: tmorris1
Probably a buildup of minerals and calcium inside which is making it less efficient. You are on borrowed time. Replace it before it bursts and floods your basement.


+1 Replace it. My Rheem (less than 10 years old) started splitting and leaked. Didn't flood, fortunately, but the new one my plumber neighbor put in has slightly less BTU, but performs 100% better. New ones are much more efficient anyways and at 20 years old? Don't chance it. Replace it!


-----------------
1990 Nissan 300zx - Castrol Edge Euro 0W-40
2004 Nissan Quest - Pennzoil Platinum Euro 0W-40
2003 Ford Excursion 7.3 PSD - Mobil 1 TDT 5w-40
Re: gas water heater troubleshooting / replacement [Re: greenjp] #4659180
02/07/18 03:47 PM
02/07/18 03:47 PM
Joined: Oct 2014
Posts: 11,864
Idaho
CT8 Offline
CT8  Offline
Joined: Oct 2014
Posts: 11,864
Idaho
Time to replace.


2015 Ford F150 2.7
2018 Ford F350 6.2
Re: gas water heater troubleshooting / replacement [Re: Wolf359] #4659196
02/07/18 04:13 PM
02/07/18 04:13 PM
Joined: Sep 2015
Posts: 5,868
Kalifornia Kollective
BrocLuno Online content
BrocLuno  Online Content
Joined: Sep 2015
Posts: 5,868
Kalifornia Kollective
Originally Posted By: Wolf359
They're pretty simple. The usual suspects would be to drain the tank, could be sediment on the bottom. Then it's possible it's the inlet water tube. Depending on where that breaks off, you'll start getting cold water instead of hot water. Cold water fills from top and hot water is at the bottom. If it breaks off near the top, you won't get that much hot water before you end up with cold water. You can replace the tube, but most people usually give up at that stage and just get a new one.


Wrong way round. They both fill and exit from the top, but the cold goes to the bottom though a high temp plastic inner tube called a "dip tube". It carries the cold to the near-flame area. If that tube has cracked or broken it will let cold water in at a different height and you will have less hot water ...

You have replaced your anode rod every 3~5 years right? So you know what the top fittings look like. Take off the cold feed side and see if you can fish out the dip tube? Check it for length against the side of the tank. It should reach from near the top to the thermostat'ish. If it's short, that's your answer. Go to big commercial plumbing supply and get new dip tube. While you are at it, get new anode and change both smile


Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: gas water heater troubleshooting / replacement [Re: greenjp] #4659198
02/07/18 04:13 PM
02/07/18 04:13 PM
Joined: Jan 2005
Posts: 5,665
Charlotte, NC
Oldmoparguy1 Offline
Oldmoparguy1  Offline
Joined: Jan 2005
Posts: 5,665
Charlotte, NC
If you are on well water or any supply with high mineral content, then your cold water in pipe, (downtube), has corroded and fell off. Time for a new one.


A Randomly Selected Thought For The Day:
If Noah had used Zip, he could have used a smaller boat.
Re: gas water heater troubleshooting / replacement [Re: greenjp] #4659201
02/07/18 04:17 PM
02/07/18 04:17 PM
Joined: Jan 2015
Posts: 253
Cleveland, OH
silveravant Offline
silveravant  Offline
Joined: Jan 2015
Posts: 253
Cleveland, OH
Actually the dip tube takes cold water to the bottom where it's heated and rises to the top.

Do you ever hear a rumbling noise? That's water boiling under a layer of sediment. The sediment insulates the heat from the water in the tank making the unit less efficient. Sometimes it's possible to take the drain valve out and break up the sediment with a piece of wire, etc. and flush it out the drain.

If it's really 20 years old it's probably time to replace.

Unfortunately water heaters have become much more expensive.

Re: gas water heater troubleshooting / replacement [Re: greenjp] #4659202
02/07/18 04:17 PM
02/07/18 04:17 PM
Joined: Mar 2016
Posts: 1,351
toronto
PeterPolyol Offline
PeterPolyol  Offline
Joined: Mar 2016
Posts: 1,351
toronto
Blow it down at least and get the loose deposits out, as mentioned buildup can easily drop your efficiency. I'd personally pull the plastic drain valve out and replace it with a ball valve for one, in the process conducting the blow down. How is your water hardness? How is your anode rod? Our tank, natural drafted like yours installed in 2003 with the Unitrol set to HIGH.

Hopefully your dip tube is not broken (seems unlikely, they usually break during transportation laying on it's side) that would indeed cause a sudden drop off in heating.

Re: gas water heater troubleshooting / replacement [Re: greenjp] #4659255
02/07/18 05:14 PM
02/07/18 05:14 PM
Joined: Jan 2017
Posts: 316
NJ
JLawrence08648 Offline
JLawrence08648  Offline
Joined: Jan 2017
Posts: 316
NJ
The sediment on the bottom acts as insulation preventing the flame below it from heating the water as much as it should. Turn the burner off, drain the tank, and turn the water on with bursts trying to knock the sediment loose, flushing out again by draining, repeat several times, then refill. You may need to invest in a new heater.

Re: gas water heater troubleshooting / replacement [Re: greenjp] #4659328
02/07/18 06:41 PM
02/07/18 06:41 PM
Joined: Mar 2004
Posts: 20,761
Upstate NY
Donald Offline
Donald  Offline
Joined: Mar 2004
Posts: 20,761
Upstate NY
Drain sediment and see if it helps.

Snap the drain valve and see if it shuts all the way, or replace. They crud up and leak. Never open it to test unless your about to replace it. Once open, if there is crud it may never go back fully shut.


2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: gas water heater troubleshooting / replacement [Re: greenjp] #4659336
02/07/18 06:51 PM
02/07/18 06:51 PM
Joined: Nov 2009
Posts: 1,845
Ontario Canada
cjcride Offline
cjcride  Offline
Joined: Nov 2009
Posts: 1,845
Ontario Canada
20 years old. It owes you nothing.
You deserve a new one.

Re: gas water heater troubleshooting / replacement [Re: greenjp] #4660091
02/08/18 04:25 PM
02/08/18 04:25 PM
Joined: Nov 2011
Posts: 1,060
Lyndhurst NJ
Audios Offline
Audios  Offline
Joined: Nov 2011
Posts: 1,060
Lyndhurst NJ
Just replace it, like someone said you dont want it to burst, take it from me. Came home to my sump pump blasting waster out on my street. Found shin deep water in my basement, tank burst and kept trying to fill for who knows how long. Insurance covered it, but they opened every wall in the basement up, ran huge dehumidifiers and had to spray the [censored] out of everything with mold killer. Was a huge nightmare, especially for the 800-1000 or so the new one cost, ours was a 40 gal so much smaller than yours.


2002 VW Golf TDI-Mobil 1 5/40 TDT
2007 Mercedes GL320 CDI Fuchs 5/40 GT Pro XTL
2005 BMW M3 BMW Twin Power 10/60
2003 BMW M5-Fuchs 5/40
1998 BMW M3/4/5 Fuchs 5/40

BOB IS THE OIL GUY® Powered by UBB.threads™