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
92 views

Bench soldering copper pipe into a subassembly

Is it possible to pre-assemble and pre-solder copper pipes into a subassembly that then can be installed using a threaded fitting? I'd much rather solder the joints either in an oven environment or ...
1
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1answer
68 views

What to do when the cold water valve on the water heater is welded on?

Our hot water seems to be running out faster than usual, and thanks to this site, we were guessing that we probably have a broken dip tube in our gas water heater. Unfortunately, someone in the past ...
2
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1answer
180 views

When do tankless water heaters need to be descaled?

I had a Bosch tankless natural gas water heater that stopped working with C7 and EA error codes and the plumber indicated that the unit had failed due to water getting into the internals like the fan ...
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0answers
134 views

Why does it take so long for my water to run hot and why does it not last in the shower?

I have a State electric compact water heater model 6-120. When I run the faucet it seems to take a long time for the water to run hot. About a minute or two. When I take a shower I can run the hot ...
2
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4answers
12k 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 ...
6
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3answers
16k views

Why is water heater making the water smell like sulfur?

I have an electric water heater that gives the water a sulfur smell. It is only from the hot water. I have heard that changing the anode in the unit can help. If this is the case, what material ...
6
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5answers
790 views

Prewarming for tankless waterheater

I have a tankless water heater that is just a little bit to small for our new house - the temperature rise isn't quite enough for the winter months. Our basement is big and relatively warm so I struck ...
7
votes
4answers
23k views

Why does my kitchen faucet have low pressure after the water heater was replaced?

I recently replaced my water heater, and since then, the water pressure for my kitchen faucet is really, really, low. None of my other faucets seem to be affected (bathroom, shower, etc.). I can't ...
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0answers
71 views

Direct Vent Water Heater Flue Exhaust

We recently moved into a property with 2 water heaters installed in the basement. During the inspection, we were told that the water heaters were relatively new, but the exhausts were "odd". ...
3
votes
1answer
141 views

What disadvantages do thermostatic mixing valves have?

I will soon be buying a new water heater for my home. I want to set the heater to keep the stored water at least 140 degrees Fahrenheit (60 degrees Celsius), and use a thermostatic mixing valve to ...
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0answers
99 views

How to prevent sudden changes in water temperature (shower)?

I have an apartment in an older building. The boiler apparently was recently replaced by the building manager in the past few years, but every time I take a shower, the temperature changes are pretty ...
3
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1answer
669 views

Is there a specific NEC code specifying the distance between water heaters and electrical panels?

I have a condo in a large building with many identical units. Several times other owners have mentioned that the original layout of the utility room isn't up to code due to the proximity of the water ...
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1answer
166 views

Low dynamic hot water pressure throughout the house

I recently bought my first home, and the first thing we noticed is that the dynamic hot water pressure is pretty low compared to the cold water pressure. I purchased a water pressure gauge and found ...
2
votes
1answer
240 views

Do I need to shut off the gas to my water heater, when I shut off the cold water intake to fix a leaking hot water faucet in my basement sink?

I need to replace a leaking hot water faucet in my basement laundry sink. To do this I need to shut of the hot water going into that faucet. The only option I see is to turn off the cold water intake ...
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3answers
346 views

Running computers in basement storage room safely

I have kinda an odd one. I'm mostly concerned about fire safety here and am not concerned about power, I already know how to handle that properly. I have a somewhat large basement with an unfinished ...
2
votes
2answers
356 views

Code for elevating water heater in garages?

A gas/propane water heater in a garage is elevated. This is to ensure the open flame (at the bottom) is above a certain height (?) to avoid any combustible fuels in the garage from igniting. This all ...
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vote
1answer
252 views

Can I connect my water heater pan drain to the building waste drain? (CPC)

This question is relative to the California Plumbing Code (CPC), specifically the Sacramento area. I'm doing some remodeling of a bathroom where the water heater pan drain line comes across the ...
2
votes
2answers
267 views

Legal water heater replacement

I'm looking to replace my water heater. I currently have a 15 year old 40 gallon gas water heater, and it's time to go. I had several quotes from local plumbers, and choked at the prices. I'm going to ...
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1answer
120 views

Merging water softener drain line to water heater relief valve drain line

I'm wanting to install a water softener. Can I merge the drain pipe from the softener with the line coming from the relief valve on the top of the water heater? I'm concerned about the elevation of ...
2
votes
2answers
115 views

Is there any harm in turning my water heater to off or to pilot for perhaps six months?

I'm finding I use almost no hot water at home (shower at gym, launder in cold; a bit for dishes) and am wondering if I can just turn the hot water tank off, or at least to just pilot, for up to say ...
2
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2answers
98 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
235 views

Water heater on concrete--should I build a platform? how much heat loss in winter?

I don't know if that title the best way to phrase the question. It's winter(ish) now, and I swear the hot water just doesn't last as long as it does in, say, September. The water heater tank is ...
9
votes
5answers
29k 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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2answers
72 views

Electric water heater leaks around the top, how do I fix it?

My water heater is leaking from the top around the copper fittings. It seems to be filled to capacity. Will adjusting my pressure relief valve stop my water heater from leaking? I turned the main ...
2
votes
1answer
570 views

A boiler and a hot water tank … what is this configuration? (UK)

I'm a west-coast American living in London. I've mostly known homes with electric baseboard and central forced air heating, and a single hot water tank for showers and taps. In the UK hot water fed ...
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0answers
50 views

Strange configuration for laundry area needs solutions

We are being given the chance to buy the house we are renting, but I have some major concerns where it comes to the laundry area. You see, the washer hookup and gas hot water tank are in a closet ...
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1answer
74 views

Electric water boiler .. how is the system supposed to work? (UK)

I'm not from the UK and am used to water being heated on-demand by a gas heater. Having recently moved to London, the flat has electrical heating and I cannot figure out how I'm supposed to set this ...
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1answer
1k 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 Channellock pliers can get a grip, but slips off pretty easily. Is there something ...
2
votes
3answers
2k 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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0answers
58 views

Why does the pressure relief valve on my gas water heater open at only 115 °F?

I have a new gas water heater; it is doing the same thing as my old one. The pressure relief (T&P, safety) valve will open at 115 °F or after I take a shower when the water heater is heating ...
0
votes
1answer
74 views

Why the huge difference in cost for Tankless vs Traditional Tank water heater installation?

I recently had my 50 gallon traditional tank natural gas water heater fail on me. It cracked and flooded my garage. After the cleanup I called out my go to plumbing company to come give me an estimate ...
7
votes
4answers
6k views

Why is the first shower of the day is colder than the second?

Description Since I've moved into this house, I've noticed that the first shower of the day is colder than the any subsequent shower. More specifically, if no hot water has been used for a while, ...
0
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1answer
202 views

Water heater refuses to light after power outage

I have an AO Smith FPSH 40 252 High-Efficiency gas water heater, about 14 years old. Today we had a power outage due to high winds and when the power came back on, the heater refuses to ignite. The ...
2
votes
1answer
95 views

Is there a danger of back flow from water heater while replacing a saddle valve?

We have a leaky saddle valve feeding our humidifier. We eventually want to get a real valve installed, but for now are looking for a cheap near-term solution. Here is my concern: the original ...
2
votes
1answer
541 views

Tankless 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 water heater two years ago. Our hot water is very inconsistent. When someone ...
8
votes
2answers
1k views

What is the proper way to clean a water heater?

I have heard many times that it is good to clean your 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 different ...
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vote
1answer
5k views

What can cause foggy/misty/gray water when 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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0answers
47 views

Why is the gas water heater pressure valve leaking after installing recirculation pump & old radiator?

Kind of a complex situation. Using gas water heater as a boiler for an old cast iron radiator. In addition we added a recirculation pump. Everything was working fine but then we had leaking from water ...
0
votes
1answer
789 views

Low hot water pressure in one fixture after water heater replacement

I just had my water heater replaced (by a professional) and everything is great except the bathtub fixtures (shower head and tub faucet) in just one bathroom. The water pressure is really low, ...
1
vote
1answer
53 views

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 ...
0
votes
1answer
370 views

PVC vent pipes or concentric vent pipes for tankless gas water heater?

I am trying to select a natural gas water heater to install into my house. It has to service two bathrooms with showers and two kitchen sinks, a dishwasher, and a washing machine. I've narrowed my ...
2
votes
2answers
99 views

What should I use to cover the walls of an alcove for a water heater?

My water heater is located in an alcove on the back corner of the house. Today I found water line leaking from the heater, replaced and it is good now. I have always just assumed the walls and ...
0
votes
0answers
44 views

Why would the water pressure seem to change after installing a new water heater?

We replaced our water heater recently and in less than 12 hours the TPV started dribbling water out of it. Shortly after the installation we noticed an increase in the water pressure when the toilet ...
3
votes
1answer
2k views

How long should the hot water last during a shower?

Given a 40 gallon natural gas water heater, and a shower head with a flow rate of 2.5 gallons per minute. How long should the shower be able to maintain 105°F water temperature? Assume the average ...
0
votes
1answer
67 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 ...
0
votes
1answer
316 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. ...
0
votes
1answer
31 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 ...
0
votes
1answer
705 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
144 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
238 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 ...