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
443 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
votes
2answers
810 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
votes
1answer
763 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
votes
1answer
5k 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
410 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
251 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
190 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
782 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 ...
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2answers
2k 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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2answers
16k 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
4k 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
158 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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2answers
97 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
188 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 ...
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3answers
2k 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
461 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
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1answer
135 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
196 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
258 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
votes
2answers
6k 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 ...
2
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1answer
416 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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1answer
2k 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
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1answer
171 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 ...
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2answers
86 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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1answer
268 views

What could be causing corrosion on a water heater burner?

Every 6 to 8 months or so my water heater (A.O. Smith 'Power Shot' high-efficiency) stops heating. The first time this happened (mid 2010) a plumber friend discovered that the burner had some ...
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0answers
88 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
2k 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
1k 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
179 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
821 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 ...
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1answer
541 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
48 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
56 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 ...
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1answer
110 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 ...
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2answers
156 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 ...
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2answers
48 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 ...
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vote
1answer
188 views

What's causing the smell in my basement?

I suspect my natural gas water heater is filling the basement with an off-putting odor similar to what it smells like when someone gets a perm. I guess you could say its like the sulfur/rotten egg ...
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1answer
41 views

possible cause for the water heater being unable to be lighted

The water heater could not be lighted. I tried several times without being successful. What could be the possible causes for the water heater to fail to be lighted. This water heater is only 1 and ...
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1answer
473 views

How can I prevent a tankless propane on-demand water heater from freezing up in very cold climates?

We are considering installing a tankless propane on-demand water heater in a residential setting, where multiple tenants use a shared bathing facility (presently served satisfactorily by a 40 gal ...
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2answers
112 views

Is it practical to install a second water heater near my kitchen?

My bathroom and my kitchen are very far apart in my house. The original water heater is in the bathroom. Is it practical to install a second water heater (small) near the kitchen so that it runs (the ...
1
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1answer
826 views

How can I monitor the temperature in a hot water heater?

When my hot, water heater runs out of hot water, I have to wait a while until it's hot again. I'd like a way to check the temperature without running water to the faucet every 10 minutes. Is it ...
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vote
1answer
5k views

What can cause foggy/misty/gray water when water heater is turned off?

This may be expected behavior but I thought I'd ask anyway... We recently had gas turned off at our house in preparation for a fumigation this weekend. We have a gas water heater (with a tank) so ...
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2answers
875 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 ...
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1answer
63 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 ...
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1answer
116 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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1answer
77 views

Can I use duct tape instead of a draft hood?

I have a small opening between my vent and water heater. Instead of buying a draft hood, is there any harm in using duct tape?
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1answer
50 views

Water heater problem

I'm going out on a limb posting here, but I'm really at a loss. I live in an apartment, built roughly 30 years ago. In the last two weeks I've had to call maintenance as I've lost hot water. Each ...
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1answer
62 views

Why is my water heater leaking?

Last night after I took a shower, I heard water still running and I saw that it was leaking from the bottom of the heater. I shut off the hot water and it still wouldn't stop, so I turned the water ...
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1answer
59 views

How do I replace a damaged valve on a water heater?

Near the bottom of my hot water tank there is a plastic valve that looks like it is used for draining the water out of it. It has developed a hairline fracture along the length of it and small jets of ...