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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1answer
29 views

What could cause my water tank to leak only when I turn off the main water supply?

I travel quite a bit and so leave my water heater breaker off - as I travel for extended periods (months). In the past I used to leave the main water valve (near the meter) on - and would turn off ...
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1answer
33 views

What could cause my electric water heater to over heat water?

About a year ago our 15 year old electric water heater heated the water nearly to the boiling point until the breaker on the tank shut off the power. When I reset the breaker the temperature went ...
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1answer
195 views

Water heater leaking from the top?

I recently noticed that water is pooling on the top of my water heater. When I took a closer look it appears that the leak is coming from where a metal hose comes into the top of the water heater. ...
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1answer
107 views

How to prevent pressure from dropping from my water heater?

Until two weeks ago, my parents house used one water heater ( noted "1" on the picture) to provide two bathrooms and the kitchen with hot water. The bathroom on the first floor consists of a bathtub ...
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1answer
66 views

What's causing the smell in my basement?

I suspect my natural gas water heater is filling the basement with an off-putting odor similar to what it smells like when someone gets a perm. I guess you could say its like the sulfur/rotten egg ...
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1answer
16 views

Rust in gas flame area of water heater, should be replaced?

There is rust right above the gas flame in our water heater (not outside the water heater as in this question Rust spots on water heater -- time to replace? or on the inside where the sacrificial ...
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2answers
628 views

What does the low pressure light on my Rinnai tankless water heater mean?

We have a Rinnai tankless water heater in the basement. Our housemate has a bathroom in the basement. About once a week, the water turns cold during her showers or when she uses the sink. We have no ...
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1answer
35 views

Should I replace an old breaker or add a new one?

Our old circuit breaker for our water heater seems to be at the end of its life. However, the breaker also controls our well system, and the breaker is only 20 amps. Is it okay for us to just replace ...
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0answers
47 views

Why does my hot water smell like wood smoke?

We live in MN, in a house built in 2008 (and our water heater, installed in the basement, is about that vintage). For the past few weeks, I'm detecting a smoky smell from the hot water out of a ...
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1answer
44 views

Why is my water expansion tank leaking?

I live in the northeastern US and we just turned the heat on (oil) and this morning I went down to the basement and saw this: The water is coming from the plumping above something labeled "water ...
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5answers
256 views

Is it possible to make my own solar water heater?

After blowing (what I consider) a lot of money on 2 residential solar water heaters, over the last 6 years, dealing with 3 set of rather expensive inner-tank replacements, evacuation pipe changes I am ...
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1answer
60 views

T&P valve draining - expansion tank issues?

I am having issues with my Water Heater. It's a slantfin tankless boiler (TR-30 PT). It's running on a 4 zone setup. I typically only use one of the zones though. We've been in the home for a year and ...
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2answers
49 views

Using PEX for a water heating system

I am replacing my existing faucet plumbing with red / blue PEX all over the house. Everything that goes to the sink, dishwasher, washer, bathroom sink and so on will be color coded and installed ...
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1answer
29 views

How to measure water pump pressure in a spa heating system?

Short version (TL;DR): how can I measure the output pressure of a water pump in a spa heating system and verify that it is within the gas heater input pressure specs? The Whole Story I'm trying to ...
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2answers
12k 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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1answer
121 views

Why is boiling hot water coming out of every faucet, and even the toilet?

Help! I live in a 80 unit condo (8 floors), with hot water tanks on the top floor (4). They flow down 13 different lines to different units and hot water is recirculated through recirc pipes. ...
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2answers
63 views

How can I go back to a gas water heater?

I recently got a condo unit (low rise condo) on the 4th (top) floor. The unit previously had a gas water heater but was replaced with an electric unit after the gas one broke down I suppose. This was ...
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3answers
28k views

What causes a water heaters relief valve to discharge water?

I have a Gas Reliance Water Heater 1212. I found recently (in winter) there is a water dip through the relief valve into a 5 gallon bucket. Sometimes, it can fill the whole bucket. Sometimes, it has ...
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2answers
58 views

Addressing irregular water pressure

Some time ago I posted about issues with my tankless water heater, concerned about the water going cold mid shower. Recently I found the issue isn't in the water heater - there are times when all ...
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0answers
66 views

I've noticed the water from the sink won't heat up, while the water in both bathrooms heats fine.

I've been renting this home for more than a year and there have been a lot of plumbing issues - mostly leaks, but the water in the kitchen has always heated fine. There is a leak under the sink as ...
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3answers
115 views

How to determine gas leak on a water heater?

My gas water heater is certainly leaking gas. I can smell it. Using the image below, it seems like it might be coming from the red circle where the dial connects to the thermostat or the blue circle ...
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0answers
914 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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2answers
2k 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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2answers
760 views

Is it okay to put a heat pump water heater in a crawl space?

I have a pretty large crawl space. It is 80 inches wide and around 7 feet high. I am looking to replace the 50 gallon electric water heater with the new Geo Spring Water heater by GE This unit is wide ...
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4answers
13k views

Why will my pilot light on the gas water heater not stay lit for more than 15 minutes?

The pilot light went out on my gas water heater. I followed the instructions and had it lit three times now for about 15 minutes each time but it wont stay lit. Not sure what to do at this point?
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1answer
30 views

Will a water heater use more or less power overall if equipped with larger or smaller heating elements?

For electric water heaters that can be obtained with various different options for the size and power draw of their heating elements, will larger elements use more power overall? For example, let's ...
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1answer
36 views

Should I unplug the timer on the water heater when shutting off water to the house?

If I shut the water off to the house, do I need to unplug the timer on the cold water heater?
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1answer
3k views

Why won't my water heater blower shut off?

My water heater has a blower attachment that kicks on when the water heater begins to heat water and shuts off when it is done. I'm no water heater expert, but I believe that these actions are ...
2
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2answers
3k views

Is it safe to shut off cold water entering water heater?

I have a pretty bad situation at my place. I have a leaky shower faucet which has gone from drips to a steady stream. I calculated the flow at .3 gallons per minute. My very old home has no private ...
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1answer
76 views

Can I add elbows to move a b-vent exhaust?

I am planning out a kitchen remodel, and would like to move the main exhaust vent for the water heater about 4-6 inches from where it currently passes through the kitchen area. The catch is that I ...
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1answer
44 views

Can I use duct tape instead of a draft hood?

I have a small opening between my vent and water heater. Instead of buying a draft hood, is there any harm in using duct tape?
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3answers
6k views

What is causing my gas water heater to squeal?

I have a gas water heater. Starting yesterday, when the flame is on, the unit makes a squealing noise of moderate volume. The noise stops immediately when the flame turns off. This means it is not ...
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2answers
8k views

Should water heater thermostats be set to the same temperature?

Should the top and bottom water heater thermostats be set to the same temperature? I did a quick google search and saw all kinds of differing opinions. for instance, this guy seems like he knows ...
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0answers
268 views

Tankless cold 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 cold water heater two years ago. Our hot water is very inconsistent. When ...
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2answers
14k views

What can cause an electric cold water heater to stop working?

Last night my electric cold water heater stopped working and I'd like to figure out whats wrong with it before going off and calling a repair service. What are some things I can do to troubleshoot ...
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1answer
4k views

What can cause foggy/misty/gray water when cold 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 ...
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2answers
1k views

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

I have heard many times that it is good to clean your cold 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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1answer
25 views

Are large temperature variation in a water heater normal?

I live in an apartment with a water tank and heater in the laundry room. About a month ago I had the heater replaced because it was leaking on my floor. Right after it was installed I noticed the ...
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1answer
33 views

Cold water heater problem

I'm going out on a limb posting here, but I'm really at a loss. I live in an apartment, built roughly 30 years ago. In the last two weeks I've had to call maintenance as I've lost hot water. Each ...
2
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1answer
66 views

Is my water heater connected to GFCI and is it affected after short circuit?

I am an absolute n00b when it comes to home electrical systems. Please do forgive me if this is a repeat question since I wouldn't know what to search for. I am in France and I have 230V supply at ...
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0answers
37 views

How do I repair a water heater plastic drip pan and what supplies do I need?

How do I repair a hot water heater plastic drip pan, and what supplies do I need? Suggestions on who to call for repair if I can't do it myself?
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2answers
101 views

Why can't I get hot water quickly at my vanity sink?

Whenever I turn on the hot water, it takes 3-4 min to get hot water at the vanity. It takes 1-2 min. for the shower. I have a gas heater. Can it be fixed or does it need to be replaced?
5
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4answers
521 views

Replacing a hot water heater: tank or tankless?

We've lived in this house for 20 years and the hot water heater (tank style) was 2 years old, as was the rest of the house, when we moved in. In the last year or two we've started to have occasions ...
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1answer
219 views

Could this corrosion be caused by faulty ground wiring?

What might cause slight corrosion atop a tankless water heater's copper topped element assembly? I checked all the grounding and reconnected the two element assembly grounding wires and ensured ...
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0answers
28 views

hot water tank pressure relief valve

Before leaving on vacation I set the thermostat on my hot water tank to VACATION setting. Having been gone for 1 month, upon my return I set the tank back to my normal setting...Medium hot. I just ...
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2answers
390 views

Why isn't the water on my second story getting as hot as I'd like?

I purchased a new whirlpool water heater about 2 months ago. I have a two story house, their seems to be a good hot water to the first floor faucets but it seems like it takes a long time for the hot ...
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1answer
51 views

Switching electric boiler off for months — any precautions?

I have an electril 50-litre water heater (boiler) in an appartement that's going to be abandoned probably for several months. I thought about switching off the boiler's electric fuse to switch off the ...
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1answer
110 views

Replacing water heater gas control valve

First let me summarize my questions, then provide detail: Summary: Can a newer gas control valve be installed on an older water heater? As an individual who has never attempted something like this ...
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1answer
46 views

Why is there no hot water in the kitchen after flushing our water heater?

My husband and I recently moved into a new house that has two water heaters. One is gas and supplies the main portion of the house, the second is electric and (as far as we can tell) only supplies the ...
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4answers
97 views

Leave the water heater on?

When I lived in France and the US, we can an electric boiler for hot water. It was "always on", probably with a thermostat. Now I live in an area where most people have a power switch that they turn ...