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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4
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4answers
21k 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 ...
5
votes
3answers
27k 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 ...
1
vote
1answer
58 views

Should I turn the hot water tank off or turn it down on extended vacation?

I am going to FLA for winter this year. I will turn off my water to my home, and set my thermostat at 55 for my 4 month absence. Should I also turn my hot water tank off? Or should I turn to lowest ...
0
votes
0answers
9 views

Leakage in water heater expansion tank

In my case oil is leaking from threaded connection point of the water heater expansion tank.Where as i understand it should be the leakage of water only from threaded connection area of the expansion ...
0
votes
1answer
32 views

What is causing my gas water heater to make a high pitched noise?

I woke up two mornings ago to water that was colder than usual, so.. I naturally went to check the water heater and the pilot was out, the pilot light has never went out in the 4 years- almost 5 I've ...
1
vote
2answers
299 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 ...
6
votes
5answers
18k views

Why does hot water come from the faucet when only the cold water tap is on?

On occasion, when I open the cold water tap on the kitchen sink, the flow from the faucet briefly becomes warm: it starts cool, becomes warm for about 30 seconds, and then returns to the desired cold ...
0
votes
1answer
23 views

Adjusting tankless water heater temperature without factory controls?

I have an older Noritz N-069M tankless water heater without a "remote control" or display. I think I am not using enough hot water to consistently keep the heater running while showering (water goes ...
1
vote
1answer
19 views

Sediment on side of water heater?

Here's an image of my hot water heater that's been knocking fairly hard. Does this give anyone an idea of what was done to this? It looks to me as if someone tried to remove the heating element, in ...
0
votes
0answers
29 views

Methods for hot water heater knocking. Do they work?

My son has a home owner's warranty on his new (to him) house. His hot water heater is knocking from sediment build up fairly bad such that, at times, I think someone's shooting off fireworks in the ...
0
votes
1answer
43 views

T&P drain line needs to be outside of the house?

I called the gas company to turn on gas. But the engineer left a note saying that "T&P drain line needs to be run outside of house". I called my plumber but he didn't know such a thing. Can ...
1
vote
1answer
56 views

I Replaced Pressure Relief Valve on Rinnai water heater (twice!!). New one does not hold ANY pressure

I just finished replacing the pressure relief valve on my Rinnai hot water heater. Everything went well, I turned on the cold input and wham, water just started gushing out of the relief valve. All ...
1
vote
1answer
37 views

Flow sensor adjustment for Navien 240S natural gas

We installed a Navien 240S natural gas in our house, and it is working fine. Except the short range for hot water valves in the showers. So, in other words, I need to turn shower valve almost all ...
1
vote
8answers
919 views

Replacing a water heater--the physical task, not the plumbing part of it

Once again it's time for a new water heater and I find myself dreading the task. The water heater sits on a pedestal that is approximately 18" high (required by code) and lifting a 50 gallon water ...
0
votes
1answer
28 views

Water Heater Cold Intake Pipe always drips from drain valve

The cold intake pipe for my water heater has a drain valve with plastic tubing leading to my basement drain. This tubing always has a constant flow of dripping water; basically, my water heater's cold ...
0
votes
0answers
29 views

Water heater pilot light won't stay lit. Plumber says it's attic heat

So I've heard most of the answers in other similar threads around here but this one was new to me. I recently bought an older house and it has a natural gas water heater in the attic. Nothing ...
2
votes
2answers
487 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 ...
1
vote
2answers
49 views

Is installing a tankless water heater outside a good idea?

We currently have a gas water heater in our laundry room (part of a converted garage, on slab). The hot water and gas are (obviously) running to it with no problem. When I was getting a quote for a ...
1
vote
1answer
2k 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 2nd-...
2
votes
2answers
94 views

Can i use a water heater as my source for the in floor Pex tubing system?

I installed Pex tubing in concrete in 2 areas, both garage floors. I have been told 2 things.... one is that it will require a boiler, two, that a hot water tank will do the job. Cost is a huge factor ...
9
votes
5answers
63k 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?
0
votes
2answers
43 views

Electrical wiring question for instant water heater

I am installing a point of use Chronomite SR-20L/240 HTR 240-Volt 20-Amp SR Series Instant-Flow Low Flow Tankless Water Heater. https://www.amazon.com/Chronomite-SR-20L-240-HTR-Instant-Flow/dp/...
0
votes
2answers
38 views

moving electric water heater to old shower cove

doing extensive remodeling of a small (1400 sq ft) house. I want to move the electric water heater to an old shower cove. Getting the wiring there will be easy (its about 5 feet away and all the walls ...
0
votes
1answer
112 views

Water heater not filled with water before being turned onto hot setting

I had a new water heater installed by a local handy man plumber. My initial concern was tank had 3 dents in it. Was on phone with company (Sears) re: dents, so plumber was delayed some due to phone ...
0
votes
0answers
18 views

Hot water issues in apartment [duplicate]

We had changed the shower handle cartridge last year per a plumber's suggestion and it seemed to resolve the situation but apparently it didn't. Right now, for some strange reason, one fixture is ...
1
vote
1answer
35 views

What type of Anode rod should I get for my water heater?

It's time to replace my anode rod and I'm not sure what type I should get (Magnesium, Aluminum, Combination, or Powered). I have a well and use a water softener. I have a high iron content (orange ...
0
votes
0answers
32 views

Hot water temperature fluctuating

I have an 8 year old A.O. Smith gas hot water heater that might be having some issues. What we're seeing is that the hot water temperature in our house has been fluctuating a lot lately. Sometimes ...
0
votes
1answer
32 views

Electric water heaters

I just put in a trailer and was informed that they had just turned on the power. There isn't a water hookup yet. Will it hurt the heater to be on with out water going to it before I can get back?
7
votes
6answers
32k 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 ...
0
votes
0answers
17 views

Water heater not heating water

Installed new electric water heater. Installed timer. Installed 60 amp double breaker at main panel. Installed sub panel 30 amp double breaker. I'm getting power to the 30 am sub panel and to the ...
0
votes
0answers
19 views

Hot water problem in 2nd bathroom

We have a 2 story house, in the 2nd upstairs bathroom the bath hot water is cold but the basin runs hot then scalding (both are mixer taps). The shower fluctuates between OK and cold. All other hot ...
1
vote
2answers
79 views

Why do both water tanks have hot inputs? Is my boiler (on-demand) feeding into my hot water heater?

I have an interesting setup that I'm trying to understand (without tearing apart sheetrock). I have two electric tank-based water heaters, and a tankless gas water heater that is used for the boiler ...
1
vote
0answers
47 views

Gas water heater auto-shut off when water supply fails?

I recently purchased an off-the-grid summer home. Solar, water collection, and propane for hot water, fridge and freezer. Everything works incredibly well. But we often leave for a few days at a ...
3
votes
1answer
6k 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 ...
1
vote
1answer
36 views

Best option for DIY water heater platform

16 year old gas water heater started leaking, so time to replace! The old water heater was on a 3-legged stand, and the stand is permanently embedded in to a concrete blob on top of the concrete ...
0
votes
1answer
35 views

Is there an electric tankless water heater that takes multiple electric lines as input?

I currently have a 50 gallon water tank in my house and I want to replace it with a tankless system. The primary reason to replace it is space. I recently installed 2 HeatWorks Model 1 units to test ...
3
votes
1answer
590 views

What are these valves downstream of my water heater?

Our water heater has two valves located on extended pipes perpendicular to the hot and cold water lines. When Spring hit, the maintenance people in my complex mentioned we needed to turn the valves ...
0
votes
1answer
49 views

Corrosion around hot water heater connection?

I installed an electric hot water heater about 3-4 weeks ago. Everything has been operating without problem and there have been no detectable leaks around the water connections into and out of the ...
0
votes
1answer
29 views

Why does water heater closet door jump open?

I have a gas water heater inside a small closet with a door. Sometimes that door jumps open a few inches, as if there is a blast of air pressure inside. This door even has a small vent in it. What ...
4
votes
1answer
91 views

Are water heater warranties really relevant quality of the product?

I have a new water heater with an 8 year warranty and I noticed that the warranty length is included in the model number. On the manufacturer's website I couldn't find any information about ...
0
votes
2answers
49 views

Gas hot water tank quit working and leaked

I came home from work today to find that the hot water wasn't working. I opened the area to my gas hot water tank and there's a large pool of water on the ground. I checked the pilot light and it ...
24
votes
7answers
6k views

Are water boilers dangerous when showering?

Where I'm from (Serbia) everybody says to turn off the water boiler (the container that heats up water and stores it for use in the bathroom and shower) when you take a shower or use the bathtub. They ...
2
votes
0answers
53 views

Possible cross over issue with water lines

About 2 weeks ago our hot water started getting less and less hot, now it is completely cold. If I turn the cold angle stop off at the sink, so only the hot water line can feed the faucet, and turn it ...
0
votes
0answers
30 views

How to shut off both cold water and hot water?

I want to install a new basin tap mixer in my bathroom but I cannot find the valve to off the hot water. I can see the cold water valve is under the sink in the kitchen. Here is the water heater on ...
1
vote
1answer
42 views

Minerals when draining water heater

Per the instructions with my new water heater, I drain a gallon from the bottom every month. The previous owner of my home never did anything and that water heater started leaking, hence the ...
0
votes
0answers
15 views

Getting at water heater anode AO Smith ECT40-200

I found this spec sheet for my water heater which shows where the anode is. However I'm not so sure which of two ports is the anode. Here's a picture. In the spec sheet diagram it seems the anode ...
0
votes
1answer
2k 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. ...
0
votes
1answer
75 views

How/where to put hydrogen peroxide in water heater

I just moved into a house that has 2 water heaters. The second one was rarely/never used by previous owner and all the hot water that comes from it is smelly. This came up during the inspections but ...
2
votes
2answers
88 views

Water Heater Dripping and Hissing Internally

I came home today and found that the gas water heater (traditional tank style) was not working. The pilot light was out so I relit it and the heater came on. After about 10 minutes I noticed that it ...
4
votes
2answers
2k 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 ...