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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Baseboard water Heater

Gas hot water boiler not turning on past pilot light and click on thermostat for more heat. The flame on the furnace does not turn on. Changed out the Thermocoupler, After starting the pilot light, ...
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1answer
28 views

closing cold water inlet valve to propane water while away for 2 months

I have a 16 year old State Industries 40 gal propane water heater. It currently works fine (only issue I've ever had was to replace the thermocouple a couple of years ago). However, I'll be away for ...
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1answer
248 views

Thermocouple keep burning out, is it our gas valve?

Thermocouple keeps burning out. Looking at 1 or 2 within 2 week period ! Tried different brands, the pilot will only stay lit for 3 minutes then automatically shuts down.
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1answer
630 views

How hot should my hot water heater vent get?

My gas hot water heater's flue/vent is very hot to the touch. Is that normal? How hot should it get?
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1answer
133 views

Why is water still above elements after draining hot water tank?

Went to change "element" AFTER draining hot water tank using hose attached to drain nozzle at bottom of tank. Drained for almost an entire day. When I went to unscrew and changed existing element (...
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1answer
182 views

Water Heater Gas B-Vent Install

I installed a new water heater and want to vent it right. The old water heater used ABS pipe since it had a blower. Basically I have a 3" b gas vent pipe coming in and connecting to a flex gas pip ...
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1answer
34 views

Water Heater PRV keeps opening

I have a water heater that is 20 years old. When we turn up the water temp the pressure release value opens and drains water into the overflow pipe. The issue is this then overflows from the top of ...
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1answer
38 views

water heater vent

In the water heater closet, the water heater is vented through the roof. There is a vent pipe that goes through the floor in the same closet. What would this vent pipe be for and can I cap it off as I ...
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2answers
98 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
62 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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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'...
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2answers
139 views

Is this a Direct Vent Water Heater?

My contractor asked me to choose a direct vent water heater and have it delivered. I (generally) understand the difference between direct vent and power vent, having read up on how they both work. ...
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1answer
44 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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1answer
8k 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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1answer
217 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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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. ...
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1answer
60 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
98 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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2answers
633 views

How much distance do I need to branch from water heater?

I moved my washer and dryer next to my electric water heater. I would like to know how close to the tank can I branch the hot and cold water lines. I would like to use a 3/4 to 1/2 inch reducer at the ...
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1answer
453 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. I'...
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1answer
51 views

Inline water heater temperature floor?

I have an inline water heater. Once it gets hot it will stay that way for 20+ minutes at a time easily. When the shower gets used it feels like their is a floor in how cold the water will get - if ...
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1answer
483 views

Why is the pilot on my GE water heater turning off when the burner turns off?

I have 2 GE 28 gallon water heaters, both of which have the same problem. The water heater is turning off after a while, and I have to light the pilot again to got hot water. What could be causing the ...
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1answer
132 views

How do I turn off my water heater drain?

I read that draining the water heater is general good practice. The problem is that I don't know how to turn off the draining plug. It kept draining water through the night. Here is a picture of the ...
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1answer
3k views

How can I remove a temperature and pressure relief valve that seems to be stuck?

I have a hot water heater relief valve that is leaking heavily. The water heater manual states I should replace the valve (which is OK by me). Unfortunately, I am not able to remove the valve as it ...
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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 ...
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0answers
29 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
37 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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0answers
14 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
18 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
28 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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0answers
14 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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1answer
26 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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1answer
28 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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1answer
99 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 ...
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0answers
28 views

Why does apartment plumbing make a rattling noise?

I live in an apartment, and recently the electric water heater was dying. There was a small leak and it stopped heating a couple times. It also made a crazy rattling sound like a little snare drum, ...
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0answers
109 views

Tankless water heater beeps and causes power surge

We have a new tankless water heater. Every time we turn on water lights through out house flicker and water heater starts beeping. Any ideas on what causes this to happen??
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3answers
52 views

Electric water heater power switch

Q1: Should there be a(n emergency) power switch next to an electric water heater? Q2: If A1 is no, is it okay to have one anyway? Q3: If A2 is yes, what kind of power switch should I use? I don't ...
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0answers
23 views

elec hot water heater stopped heating after water was shut off for repair

i am in a mobile home with a 9 month old elec hot water heater. They turned off the water yesterday due to a water main break. now it is not heating. help
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0answers
49 views

Could my New Hot Water Tank be improving my Furnace

I've gone thru 2 blower motors in my furnace in 3 yrs. Techs don't know why. I purchased a New Water Tank recently and it seems strange but my furnace is working better. Usually I could hear noises ...
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0answers
21 views

Are all boiler heating systems closed?

Are all boiler heating systems closed? In other words, are they all filled with water that is just constantly recirculated, or are there some that put the outgoing water elsewhere?
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1answer
16 views

Can I relocate my electric water heater under a basement window?

I am currently making floor plans for my finished basement in Ohio. I had a pipe near a frost free spigot rupture two years ago but that was because of a faulty washer. Is relocating the water heater ...
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0answers
72 views

Hot water no longer coming from water tank (air lock??)

Two days ago I disconnected and capped the water supply to a set of taps for an old laundry sink in my basement. I turned off the cold water supply to the house and also to the hot water tank before ...
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0answers
59 views

Solar Panel Collector type for Caribbean

I live in the Caribbean and am looking to get a solar water heater system. I’m looking into flat panel or evacuated tube system. I got an offer for an evacuated tube system with a stainless steel tank ...
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0answers
27 views

Solar water heater size

I want to build my own solar water heater. It should heat about 20-30l of water per day to about 60°C. There is about 4-5h of direct sunlight to the place I thought of putting it. How big should my ...
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0answers
38 views

Do I need to replace the thermal expansion tank when replacing a water heater?

I'm considering replacing my water heater. My existing heater has an expansion tank attached to the top; should I look into replacing that at the same time or is the life expectancy on those longer?
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0answers
149 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". ...
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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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0answers
83 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 ...
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0answers
50 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 ...
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0answers
487 views

Clicking sound from water heater after flushing toilet?

Sorry if this question has already been asked but I have a random question about my water heater to see if this is anything I need to be worried about. To start off I live in an apartment complex and ...