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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2answers
110 views

How can I adjust the temperature of my hot water?

I live in California and the winter has been a lot warmer than expected. I would like to decrease the water temperature in my home to try to save money and conserve energy. How do I do this?
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1answer
179 views

Hot water tank leaking at bottom could it go from a trickle to a gush?

My 20 yr. old gas water heater that's located in my basement has had a slow leak for 6 mos. My husband doesn't feel the need to replace it yet and feels we can just continue soak up the water with a ...
3
votes
1answer
2k 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
105 views

A line T-ing off my water heater drain line. What might it be for?

There is a line T-ing off of the DRAIN line at the bottom of my water heater and I don't know what it is for. It is UPSTREAM of the valve that I need to open annually to remove sediment from the ...
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1answer
63 views

Feedback on why constantly draining. It's starting to flood backyard

There's no leakage near/ around water heater. No slime or build up of any kind. But there's constant hot water drainage coming out through pipe in backyard. It's starting to flood back porch area. It'...
2
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3answers
20k views

What can cause an electric water heater to stop working?

Last night my electric 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 this? ...
3
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3answers
11k views

After installing expansion tank, massive buildup of pressure then a trickle?

I am completely stumped. You guys helped me out a lot with my previous question here: New gas water heater dripping relief valve, have expansion tank, what gives? Turns out the expansion tank ...
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0answers
69 views

water heater won't stay lit

Looking for suggestions on repairing my water heater. The pilot light won't stay lit. I've cleaned the air intake and checked the venting in the attic but it didn't correct the problem. It will ...
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2answers
99 views

What is the function of this electric part on my unvented water heater cold water inlet?

Does anyone know what this electric part does? In the photo it's the black plastic block device attached to the pipe on the right hand side (which is the mains inlet to the heater; the left is the hot ...
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2answers
63 views

How to ensure that water heater is mostly on or mostly off?

My friend just rented an appartment (in the UK), and during the inventory the janitor showed her the programmable water heater, and said it was configured to turn on for a few hours during the day. ...
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3answers
14k 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
97 views

Annual KWh usage of electric ignition on gas water heater

I'm shopping for a new gas water heater and looking at possibly purchasing a more efficient version with electric ignition. However, I'm curious as to whether some of the savings will be offset by ...
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1answer
898 views

Local “point of use” hot water heater

This question is a follow-up to It takes a minute or more for the water to become hot from any of the faucets in my house -- how can I speed this up?. I have a tankless water heater, and it takes ...
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0answers
37 views

New water heater, now shower goes cold if hot water is used anywhere else in the house

We just replaced a 40 gallon water heater, power vent. The plumbing company said upgrading to code was needed for the plumbing of this water heater. We replaced it with an almost identical model, eg;...
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0answers
53 views

Could my water heater be causing an electric system failure?

My water heater, a Styleboiler VF 100 SE (1200W), has never had any problem. Recently I bought an electricity timer plug (up to 3500W) to put its plug into, in order to dose the amount of electricity (...
3
votes
1answer
776 views

Pressure problems with oil boiler

I've been having continued problems with the pressure in my home oil boiler rising to 30psi over time (and then leaking out the pressure relief valve). Technicians have examined it multiple times but ...
2
votes
1answer
249 views

Can turning up the temperature of a water heater damage it?

I've got a 40 gallon water heater, and what I've been finding is that it provides just enough hot water to fill my sizable bathtub, but no more. Which means if I want to rinse off with the shower ...
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1answer
150 views

How can I check my hot water heater temperature? Isn't 120 degrees cold?

I'm trying to test the temperature of the hot water coming out of my hot water heater but I'm very confused. Can I use a meat thermometer or what should I be using? Also, just to make sure my ...
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1answer
10k 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 ...
3
votes
2answers
172 views

Will having an expansion tank on the hot water pipe cause any problems?

I want to replace my water expansion tank and I just found out that it is installed in the hot water pipe coming out from the water heater. From what I've read, it should be installed in the cold ...
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0answers
67 views

Recirculation pump seems to be working, yet no detectable heat on return pipe

Our two-story-on-a-slab house has uninsulated copper pipes, including a recirculation return pipe to a tee on the water heater drain. In past years, the recirculation seemed to give us hot water ...
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2answers
3k views

Why did my hot water stop?

I have a Rinnai RL94 tankless water heater. Today something went wrong and now I have no more hot water. The machine is not showing any kind of error code like it has in the past when things went ...
0
votes
1answer
45 views

Frozen water lines, what should I do with my electric hot water heater?

I woke up yesterday (Thursday) morning to frozen water lines. Left taps open all day and still nothing. I will not be able to get anyone in before Monday or Tuesday to thaw the lines. I don't know ...
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3answers
5k views

How do I prevent harmonic resonance hum in PVC vent of newly installed hot water heater?

I just had a new power vented water heater installed (HTProducts Phoenix Light Duty) in our crawlspace. The contractor that put it in used part of the existing 3" concentric vent from the furnace we ...
2
votes
2answers
1k views

How can I prevent the intake vent for an on demand water heater from getting plugged?

We have a Navien on demand water heater. The intake and outlet vent pipes run out through the poured concrete foundation and have a plastic grill on the end. If the intake vent is blocked in any way ...
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1answer
66 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 water heater?
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1answer
120 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 ...
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1answer
108 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
votes
1answer
348 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
343 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
votes
4answers
18k 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
votes
3answers
20k 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 ...
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0answers
153 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
274 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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1answer
259 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
436 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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vote
3answers
607 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 ...
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1answer
1k 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 ...
3
votes
2answers
812 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 ...
1
vote
1answer
275 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
152 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
votes
2answers
112 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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vote
1answer
828 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 ...
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vote
2answers
102 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
668 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 ...
0
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0answers
52 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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vote
1answer
110 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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0answers
84 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
119 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 ...
8
votes
4answers
10k 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, ...