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
959 views

Why does my Paloma tankless water heater turn off randomly without errors?

We have a Paloma Tankless water heater, model: PTG-74PVN that shuts down when in use for a few minutes. There is no code displayed on the screen, it just powers down. This started happening a few ...
2
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2answers
1k views

Can I vent a dryer from the same mechanical closet as a water heater.?

I'm currently looking at a condo to purchase and the existing "closet" that contains the plumbing and venting for a washer/dryer is a bit on the small side. It's probably not that big of a renovation ...
2
votes
1answer
285 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 ...
2
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1answer
146 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
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3answers
1k views

Does a thermocouple need to be screwed in to work?

I'm recently having trouble with a water heater. The pilot light with ignite just fine, but will go out after releasing the reset button, even after holding it for over a minute. That makes me think ...
2
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1answer
249 views

Plumber told me it's unsafe to drain my water heater — what should I do?

We are new homeowners. Our 11-year-old 2nd-floor water heater was leaking and the first plumber who came told us he would need to come back with a partner to take it away. I asked if I could drain ...
2
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1answer
998 views

Can replacing a T&P valve be done as DIY by a home owner?

I want to replace the T&P valve on my gas water heater since it is dripping water all the time. I talked to a couple of people such as my friend and a salesperson at a Home Improvement Store. They ...
2
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1answer
116 views

How do I start a cold gas heater?

The gas heater pilot light has been out for a couple of days, and I believe there is a safety mechanism that detects this, and shuts off the gas. Now, when I move the slider to the pilot light ...
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4answers
16k 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 ...
2
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1answer
128 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 ...
2
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2answers
142 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 ...
2
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2answers
143 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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1answer
48 views

Should I replace an old breaker or add a new one?

Our old circuit breaker for our water heater seems to be at the end of its life. However, the breaker also controls our well system, and the breaker is only 20 amps. Is it okay for us to just replace ...
2
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2answers
598 views

How to calculate potential energy savings from using a tempering tank?

I have a boiler (oil) with integrated water heater (3.5 gallon). I don't have problems with running out of hot water but I do wonder if having a tempering tank before the boiler would save money on ...
2
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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 ...
2
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1answer
7k views

Why is my electric hot water heater producing lukewarm/cold water?

Yesterday after returning home from work I discovered my hot water is not working. When you turn on the faucet (any in the house) just a little warm water comes out and then it turns cold. I checked ...
2
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1answer
727 views

What's with the different FHR ratings of these hot water tanks?

We're replacing our tank with a more efficient one and we can't go tankless given the cold input temperatures in Canada and the amount of output we need (for a triplex with 7 people). So I've been ...
2
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1answer
283 views

Why does my water heater stop after a few minutes?

I have a Junkers (European water heater) that works for a few minutes and then stops. Anyone have experience with this/know how I can troubleshoot? Or, would a regular plumber be able to fix it?
2
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1answer
196 views

What to look for in a new water radiator?

The water radiators I have under each window are 50 years old, and I would like some new ones. They measure HxLxD 50x100x20 cm. The new ones I would like should be as thin as possible. I live in an ...
2
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1answer
1k views

No hot water, but exhaust blower running continuously

This morning I went to take a shower and there was no hot water. I went to the basement to check on the water heater, and found the exhaust blower is running continuously but no hot water is being ...
2
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2answers
4k views

What could cause a new pressure release valve to drip water?

Installed a new pressure release valve on electric water heater because old valve was dripping water on floor. New valve also dripping water. Any ideas? Suggestions? Water temp set at 110F, so it's ...
2
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1answer
6k views

My hot water stopped working in one bathroom, what can I try in order to fix it?

I have an electric water heater from 2004. The hot water works in all other areas of my house (kitchen, other bathroom and washing machine). The sinks and shower in my master bathroom are not ...
2
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1answer
1k views

What is causing the high limit switch to pop on my electric water heater?

The high limit switch has popped twice on my electric water heater, both times at night. I reset the switch and the water heats and it's ok throughout the day. Wake up in the morning and it's ...
2
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1answer
107 views

Electric water heater overheating very quickly

We have an electric water heat that recently started heating the water to about boiling. We heard a loud pop one night, not sure if that has anything to do with it. So far we just replaced the ...
2
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1answer
350 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 ...
2
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1answer
337 views

Is my water heater connected to GFCI and is it affected after short circuit?

I am an absolute n00b when it comes to home electrical systems. Please do forgive me if this is a repeat question since I wouldn't know what to search for. I am in France and I have 230V supply at ...
2
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3answers
3k 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 ...
2
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1answer
721 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 ...
2
votes
1answer
167 views

Is it time to replace my water heater?

I have a 20+ year old, 115 gallon, electric water heater. Works like a champ, but I'm considering replacing it for a couple of reasons. It's leased - I pay $20/mo. It's 115 gallons for a house with ...
2
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2answers
208 views

How can I fix this leaky water heater?

I have an electric Water heater and it is starting to leak from what I believe to be the pressure release valve. I just wanted some tips on how I can fix this before the leak becomes unmanageable. The ...
2
votes
1answer
281 views

How can I improve my hot water heater's performance?

I don't have the equipment details on hand but could probably get them if needed. It's a pretty standard boiler + hot water heater + pump set up. Often the hot water coming out of the shower faucet ...
2
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1answer
480 views

Why does the hot water run cold at less than 'full throttle'?

I'm as environmentally conscious as the next American (probably not very) but here's an example: I like to rinse dishes that I've just washed in a stream of hot water as this works best for drying. I ...
2
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3answers
19k 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? ...
2
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1answer
3k views

Loud vibrating when using hot water!

I recently moved into a new condo with 2 kitchen sinks -- a main one and one embedded in an island. There's a lot going on under the main one -- the cold water is split so that it leads to the faucet ...
2
votes
1answer
179 views

How do I lower the temperature of an electric boiler in France/Europe?

My electric boiler is delivering VERY hot water: my hands are often burned when I forget to mix it with normal-tempered water. Do you think there is a way I can make the boiler heating the water ...
2
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2answers
110 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?
2
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0answers
96 views

Where could the air in the water system be coming from?

We live on the top two floors of a small brownstone walkup. To get the heating to work upstairs I need to bleed the baseboard heater almost every other day. All faucets in the house sputter, and the ...
2
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0answers
3k views

What could cause my tankless water heater to make a knocking sound?

I recently replaced my water heater with a tankless unit (Rheem). After installation I noticed that whenever I turned on the hot water; or when my central heating unit would turn on, the tankless unit ...
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2answers
2k 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 ...
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1answer
283 views

What are the three copper connections to my water heater?

Why do I have 3 copper pipes in my gas water heater? It seems two are cold and one is hot. All videos I see online show only two pipes; one for cold coming in, one for hot going out.
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2answers
954 views

Is my expansion tank leaking in my oil water heater system?

I have an oil water heater (see related question) used for a hydronic forced-air furnace. There is a backflow preventer on the incoming cold water and return hot water, and a small expansion tank on a ...
1
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1answer
618 views

What is the life expectancy / MTBF of a 60 gal. water heater?

Specs: Capacity: 60 gal. Power: 4500W Voltage: 240V Warranty: 6 years
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1answer
25 views

Plumbing - Particles / Debris In Faucets and Toilets - Water Softener Going Bad?

I had a hot water heater replaced in my house. Shortly thereafter, I noticed that the water flow in one of my faucets near the heater was very low. I wasn't sure, what to make of it, so I had the ...
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2answers
32 views

Can I shut off a second water heater?

I reviewed this question and answer and there's probably similarities to this question, but wasn't sure what kind of setup I have. So I'm hoping I don't get flagged as duplicate. We've got two gas ...
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2answers
211 views

Can my water heater's relief valve discharge line and drain pan line merge into a common pipe?

Currently, I only have a T&P relief discharge line that runs down to just above the pedestal and out through the exterior wall. I would like to install a drain pan under the water heater. I want ...
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7answers
261 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 ...
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2answers
93 views

How do I know when my water heater should be replaced?

The condo I just moved into has an original 2001 gas water heater that is missing a few features one would like to see in 2015, such as inspectable anodes. The home inspector pointed this out as a ...
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1answer
63 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
107 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
85 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 ...