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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What is the most efficient process for replacing water heater T&P relief valve and flushing water heater?

A home built in 2007 will come under new ownership. It is unknown whether previous owners maintained the water heater properly. Home inspector said that the water heater temperature and pressure (T&...
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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 ...
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1answer
59 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 ...
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1answer
24 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 ...
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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 ...
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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 ...
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0answers
31 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 ...
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2answers
53 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 ...
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2answers
45 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/...
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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 ...
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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 ...
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1answer
36 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 ...
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0answers
33 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 ...
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1answer
61 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 ...
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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 ...
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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?
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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 ...
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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 ...
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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 ...
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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 ...
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1answer
36 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 ...
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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 ...
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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 ...
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1answer
31 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 ...
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1answer
38 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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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1answer
79 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 ...
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1answer
28 views

Water heater drain pan pump capacity needs?

In the event of water heater failure, I'm considering installing a water heater pan with drain pump per this answer. How can I determine the necessary pump rate? According to the Insurance ...
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0answers
32 views

Why are water heaters generally installed on a pedestal? [duplicate]

Why are tank-style water heaters generally installed on a 2-3 foot (~0.6-0.7 meter) tall pedestal?
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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 ...
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2answers
85 views

Can I wire a water heater and tanning bed on the same 220V circuit?

Can I wire a water heater and a tanning bed on the same 220V breaker. I live in Ohio.
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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 ...
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2answers
166 views

Installed new water heater yesterday, today there is water in the catch pan

Yesterday we installed a new water heater. Pretty straight forward, my father in law has done many of these. I monitored pretty closely for next 12 hours and the catch pan under the water heater ...
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1answer
88 views

Mystery valve on hot water line from water heater

I have a 1/2" od PVC outside my home with a steady drip of water. It is a few inches above the line that runs to the TPR valve on the water heater (confirmed by opening the valve). It's not the AC ...
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1answer
22 views

The hot water pressure is low in my shower and tub

What would cause the only the hot water pressure to be low only in the shower. The pressure use to always be strong. It's not the shower head.
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4answers
90 views

Is a tank-style water heater always under pressure?

Is a tank-style hot water heater always under pressure? In other words, is the entire tank pressurized? Is the pressure largely created by the force of the incoming cold water supply?
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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 ...
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1answer
64 views

What is the impact of moving a geyser outside?

We have an indoor geyser but are considering moving this outdoor to save space. We live in a Mediterranean climate with a cold winter day being 5°C (41°F) and summer temperatures generally ranging ...
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4answers
603 views

How to flush all the water lines in your house

I live in a small (1-traffic-light) town in upstate NY. Some local village water officials accidentally cracked a water main (feeding water to the entire area) and so the Department of Health had to ...
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2answers
103 views

Does the gas water heater in my laundry room require a dedicated vent?

I have been told recently by a potential buyer of my home that due to the gas hot water heater in my utility room, with electric washer and dryer, that I need separate venting to bring it up to code. ...
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2answers
75 views

Broken Hot Water Circulating Pump - Shouldn't I still have hot water in showers eventually?

I have a Grundfos hot water circulator. After turning off the main to the house and the hot water circulator the other day to change out a valve for our dishwasher, the hot water circulator hasn't ...
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2answers
121 views

What is coming out of these water pipes?

I have been dealing with some hot water pressure issues. See Should hot water pressure be reduced after hot water is used? Today, hot water pressure reduced so much it was impossible to shower. In ...
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3answers
110 views

Water gets cold after ten minutes of use!

Water runs cold after about 10 minutes of showering! Also there was black stuff coming out of bath pipe before. Just got a new water heater and it didn't fix the hot water problem :(. What could it ...
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1answer
110 views

Should hot water pressure be reduced after hot water is used?

I'm noticing reduced hot water pressure (on all faucets/shower) after significant hot water use (2 long showers, 2 loads of HE (High Efficiency) laundry, and using a sink for about 5 minutes). Cold ...
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3answers
121 views

Do I need to unplug my hot water recirculating pump when I turn off the water to the house?

When I turn off the water to the house (for vacation) and open a faucet to relieve the pressure, I notice that the hot water recirculating pump makes a lot of noise that it doesn't when the water is ...