For questions generally relating to the hot-water supply system of a typical residential or commercial building, primarily regarding the heating mechanism itself (a traditional hot water heater tank, tankless heaters including "point-of-use", boilers and heat exchangers, etc).

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Why is the water heating up when it's switched off?

Our central heating is timed to come on twice a day and water heating is off. However, water is heating up. British Gas engineer unable to come up with solution (has changed a valve on hot water ...
6
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2answers
1k views

What is the proper way to clean a hot water heater?

I have heard many times that it is good to clean your hot water heater about once a year by flushing it. I went to look online to find the proper way to do so and found many people recommending ...
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0answers
67 views

Can a water heater be installed overhead?

Sorry for the long preamble: I'm doing a remodel which involves building a new attached garage. At the same time, I'm replacing the water heater because it is ancient. I have considered a ...
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3answers
6k views

Is it time to replace my 20 year old water heater?

My water heater (gas) shows a date of 1991 on it, although the house was built in 1993. There is nothing wrong with it. It is a little slow to heat the water up, sometimes taking almost 5 minutes to ...
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1answer
172 views

Is this electric water heater wiring correct?

I recently re-wired my water heater from 120v to 240v. I'm not sure why it was wired with 120v to begin with, but it was not providing enough volume of hot water. I looked up basic thermostat wiring ...
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1answer
46 views

Does a broken TPR valve disable the water heater?

Would the pressure release valve going bad on a water heater cause the water heater to quit working?
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1answer
3k views

Why is my electric hot water heater producing lukewarm/cold water?

Yesterday after returning home from work I discovered my hot water is not working. When you turn on the faucet (any in the house) just a little warm water comes out and then it turns cold. I checked ...
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2answers
3k views

What could cause a shower to give warm water for a few seconds, then only cold water?

The house has four bedrooms. The 40 gallon gas water heater is about 60 feet from this shower. The house is a one story house in flat terrain. I have already changed the mixing faucet for the shower, ...
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3answers
304 views

Is it safe to install this hot water tank from ebay?

Is it safe for me to replace my electric hot water tank with this continuous electric unit that I bought on ebay? (I'm in Australia) Technical Specifications rated power 6.0KW ...
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1answer
650 views

Why does my gas water heater's pilot light go out when I replace the outer door?

I have a 9 year old Bradford White gas water heater, model MI403S6FBN4. The pilot light went out today, and when I went to re-light it, it stays lit while the pilot button is held down, and it stays ...
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1answer
73 views

Why is my electric water heater not working?

I have electric heating in my flat. My water is not heating up even though the timer light comes on and the immersion light comes on. Any idea what it could be?
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2answers
8k views

troubleshooting a hot tub/spa that won't heat up

We have a Hotsprings/Watkins brand hottub/spa that came with the house we bought last September. At the time that we bought it, the hot tub appeared to work and heat up properly. However, now that ...
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0answers
211 views

Tankless hot water heater and inconsistent water temperature

We recently brought a house that was built in 1927, and much of it has been updated. The previous owners put in a tankless hot water heater two years ago. Our hot water is very inconsistent. When ...
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1answer
101 views

How do I turn off my water heater drain?

I read that draining the water heater is general good practice. The problem is that I don't know how to turn off the draining plug. It kept draining water through the night. Here is a picture of the ...
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1answer
37 views

Inline water heater temperature floor?

I have an inline water heater. Once it gets hot it will stay that way for 20+ minutes at a time easily. When the shower gets used it feels like their is a floor in how cold the water will get - if ...
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3answers
1k views

Is it OK to drill through a jack stud/full stud pair to cut a hole for water heater drain pipe?

I just had a new water heater installed in my garage. My city building / plumbing codes require that the water heater overflow drain be drained to the outside of the house. Situation: The heater ...
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2answers
3k views

What can I do about high water pressure that is causing a leak?

One of our showers has an intermittent leak, and I've figured out that it happens when the hot water heater is on. There's no expansion tank on the cold supply side for our hot water tank, so I'm ...
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1answer
1k views

How should I connect nipples to a hot water heater?

I recently installed my new hot water heater. I know nothing about plumbing and my installation procedure was informed only by sketchy home depot employees and youtube. One of the issues I'm having ...
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1answer
796 views

Why won't my pilot light stay lit on my hot water heater?

I have a reliance model 5 30 NORS971 gas HOT WATER tank. The basement flooded a little and put out the pilot. When it would not light, I replaced the pilot tip and went ahead and replaced the ...
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1answer
140 views

Flush a gas powered water heater, not sure if it's ever been done in 15 years. Will it survive a flush?

I'm concerned that there might be seals that are bad, or corrosion keeping things waterproof. It looks great on the outside, But I don't know how efficiently it is working - I've never owned a home ...
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3answers
3k views

How does a water-heater know when to turn on?

Now that it is getting colder, we have noticed that when we get home from work, our water is not that hot. It was warm at best after a four-day trip. The water heater is in an unheated basement, ...
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1answer
4k views

What can cause foggy/misty/gray water when hot water heater is turned off?

This may be expected behavior but I thought I'd ask anyway... We recently had gas turned off at our house in preparation for a fumigation this weekend. We have a gas water heater (with a tank) so ...
2
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1answer
187 views

Plumber told me it's unsafe to drain my water heater — what should I do?

We are new homeowners. Our 11-year-old 2nd-floor water heater was leaking and the first plumber who came told us he would need to come back with a partner to take it away. I asked if I could drain ...
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0answers
125 views

Can I reuse an abandoned roof vent?

I have a house that has an old 8-10 inch diameter vent that used to be used as stove/oven vent. I think that newer gas ovens don't require venting like a water heater needs (ie they don't have a ...
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4answers
755 views

Which water heater types do you recommend?

I would like to upgrade my current water heater with one that Is able to produce/store more heated water so I won't run out Energy efficient Inexpensive What are the advantages/disadvantages to ...
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2answers
319 views

Properly venting a gas water heater

Ahh, the joys of an old house. The former owners of my house did some funky stuff with venting the water heater. Let me explain: the water heater is in the basement there is a 3 in single walled ...
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1answer
648 views

How do I diagnose and fix an electric water heater leak?

I have an Electric Water Heater, seemingly leaking from the top of the tank. The "wells" on top are filling up with water. There are no noticeable leaks from the pipes above. Each water attachment ...
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1answer
727 views

How can I prevent water from entering through water heater/furnace exhaust vent?

I have an exhaust vent in my basement (Amerivent Type B) which takes the exhaust from my gas furnace and water heater goes out the basement wall, and up my chimney. A little bit water is coming in to ...
2
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1answer
539 views

Why does my Paloma tankless water heater turn off randomly without errors?

We have a Paloma Tankless water heater, model: PTG-74PVN that shuts down when in use for a few minutes. There is no code displayed on the screen, it just powers down. This started happening a few ...
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1answer
210 views

how do I remove a stubborn element from a water heater?

I need to pull and replace the elements in my water heater. the problem is, I can't get the old ones out. my channellocks can get a grip, but slips off pretty easily. is there something better for ...
4
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3answers
814 views

What failure modes are there for electric water heater elements?

What would be the cause of the elements to go out in my electric water heater? My wife is convinced that it's because the water heater hasn't been drained/flushed in the past 3 years. I was also ...
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1answer
128 views

What are the three copper connections to my water heater?

Why do I have 3 copper pipes in my gas water heater? It seems two are cold and one is hot. All videos I see online show only two pipes; one for cold coming in, one for hot going out.
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1answer
718 views

How can I remove a temperature and pressure relief valve that seems to be stuck?

I have a hot water heater relief valve that is leaking heavily. The water heater manual states I should replace the valve (which is OK by me). Unfortunately, I am not able to remove the valve as it ...
16
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1answer
7k views

What temperature should I set my hot water heater to?

When adjusting my hot water heater, what temperature should I set it to? Is the answer different if you have: Concerns about diseases A dishwasher Young children or elderly that can be easily burned ...
4
votes
2answers
305 views

What's the next step in troubleshooting my electric water heater?

We have a SpaceSaver (Model number: SS012SEB15), single-element 120v/1500w hot water heater which worked great until one day it went completely cold. First thing was I tested the voltage to the ...
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0answers
46 views

How do I troubleshoot a gas water heater whose dial doesn't remain set and which outputs luke warm water?

In case it's relevant: Several days ago the pilot light went out. I attributed this to having to use the shop-vac in the area and possibly blowing it out. After lighting it, it went out again after a ...
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2answers
582 views

What could be causing water to drip from the relief valve of my new gas water heater, again?

I installed a brand new water heater about 4 months ago, noticed that that relief valve was dripping like crazy. Checked the expansion tank and it was filled with water. I replaced it with a brand ...
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1answer
56 views

Why is my water heater leaking?

Last night after I took a shower, I heard water still running and I saw that it was leaking from the bottom of the heater. I shut off the hot water and it still wouldn't stop, so I turned the water ...
2
votes
1answer
117 views

What could be causing corrosion on a water heater burner?

Every 6 to 8 months or so my water heater (A.O. Smith 'Power Shot' high-efficiency) stops heating. The first time this happened (mid 2010) a plumber friend discovered that the burner had some ...
4
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1answer
72 views

Does a larger solar water heater equate to better water pressure?

Please excuse my ignorance - we want to buy a typical slanted rooftop solar water heater for our home. We thought 200L would be an acceptable capacity, but the vendor we visited today said that we ...
2
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1answer
93 views

Is it time to replace my water heater?

I have a 20+ year old, 115 gallon, electric water heater. Works like a champ, but I'm considering replacing it for a couple of reasons. It's leased - I pay $20/mo. It's 115 gallons for a house with ...
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0answers
97 views

What would cause a water pressure drop after tripping a breaker?

I recently plugged my laptop into a cheap powerbar, which caused said-powerbar to short. This tripped the "sockets" circuit on the breaker, which, upon resetting, caused power to begin flowing to ...
3
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3answers
923 views

What advantages does bending copper pipes have over joining many parts without brazing?

These questions are in context of a DIY solar water heater I am planning (another separate question). The copper pipes in question, are supposed to carry around hot water using thermo-siphon ...
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1answer
215 views

How should I avoid corrosion at this water heater connection?

I installed a new water heater 2-3 years ago. I put 3/4 pipe to PEX adapters on it and then used pex to connect to my house. On the hot water outlet, corrosion and rust is forming. I bought some ...
8
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2answers
7k views

How does Thermal Release Device (TRD) work

Rheem hot water heaters have a device in the combustion chamber called Thermal Release Device (TRD). It contains a vial filled with liquid that seems to be mounted in a flex metal plate. It is a ...
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0answers
469 views

What dangers are associated with changing the pilot light assembly on a gas water heater?

My A O Smith ProMax gas water heater started going out at various intervals. I would re-light it and it might stay lit for a few minutes, few hours, or even a day or so. I figured it was the ...
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0answers
676 views

What could cause my tankless water heater to make a knocking sound?

I recently replaced my water heater with a tankless unit (Rheem). After installation I noticed that whenever I turned on the hot water; or when my central heating unit would turn on, the tankless unit ...
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0answers
82 views

Why am I not getting hot water from my tankless hot water heater?

I just bought my house last year. The previous owner had just replaced the boiler before I closed. I had oil delivered the day that I moved in. I had problems with the hot water right away as it ...
2
votes
2answers
159 views

How can I fix this leaky water heater?

I have an electric Water heater and it is starting to leak from what I believe to be the pressure release valve. I just wanted some tips on how I can fix this before the leak becomes unmanageable. The ...
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2answers
102 views

Is it practical to install a second water heater near my kitchen?

My bathroom and my kitchen are very far apart in my house. The original water heater is in the bathroom. Is it practical to install a second water heater (small) near the kitchen so that it runs (the ...