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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3
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1answer
243 views

How to determine tankless water heater requirements?

I'm considering replacing my insufficient 30 gallon gas water heater with a tankless water heater equivalent to 50 gallon gas heater. I know a 50 gallon heater would serve my needs. Questions ...
3
votes
3answers
11k views

How do you know when you need a new water heater?

Our hot water is hot sometimes, but not always. For example I might be able to fill up a tub with hot water one morning, but the next morning the water might be cold. This is our first home and when ...
2
votes
1answer
203 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
1answer
376 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
293 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 ...
4
votes
2answers
7k views

Why is my hot water heater making my water smell like sulfur?

I have an electric hot water heater that gives the water a sulfur smell. It is only from the hot water. I have heard that changing the anode in the unit can help. If this is the case, what material ...
2
votes
0answers
83 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 ...
4
votes
1answer
4k views

Can a washer and dryer be next to a water heater?

I have a GE gas dryer (DSXH47GGWW) that is currently next to an exterior basement wall. I'd like to move it to the opposite wall (shared with the crawl space) right next to the water heater next to ...
6
votes
4answers
2k views

Should I install an inline water heater for my bathroom?

It takes 3-4 minutes of the shower running before the hot water reaches my upstairs bathroom. I'd like to not have to waste all that water and time. My initial though was to install an inline water ...
1
vote
2answers
13k views

What can cause an electric hot water heater to stop working?

Last night my electric hot 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 ...
1
vote
1answer
181 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 ...
4
votes
2answers
461 views

Should a water heater's anode be replaced?

I hear conflicting information on replacing the anode bar on a water heater or not since the water heater will be replaced anyway. Should the anode bar be periodically replaced? Why? How often?
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1answer
50 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 ...
-1
votes
1answer
1k views

How long will it be before my hot water heater blows up without a thermal expansion tank?

the county where I live put in the "check valve" or backflow device. Not sure, but I know they said you need to get a thermal expansion tank or the pressure could blow up the water heater. I spoke ...
2
votes
1answer
84 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 ...
2
votes
1answer
178 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?
3
votes
1answer
2k views

What could be causing water to drip from the relief valve of my new gas water heater?

My old hot water tank met its maker about two or three weeks ago, and since then I have installed a new Kenmore 50 gallon gas water heater to replace it. The new water heater seems to work fine, I ...
4
votes
2answers
10k views

Why is my new hot water heater making a clicking noise?

I have a relatively new water heater (installed by previous owner). I've only been in the house a few months and did not notice this noise until after being there a few weeks. What happens is after ...
6
votes
2answers
1k views

How to install Water Heater drain pan to sump pit?

I want to replace my electric water heater. The current water heater does not have a drain pan. I'd like to add one with my new water heater. This is all in the basement. Our basement does not ...
1
vote
0answers
116 views

Without having a pressure regulator or gauge, how would we determine what psi to set our new expansion tank to?

Without having a pressure regulator or gauge, how would we determine what psi to set our new expansion tank to? We just replaced the tank and hot water heater.Before replacing them, had an ok amount ...
1
vote
2answers
595 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 ...
4
votes
4answers
2k views

Can I install a hot water recirculation pump if I have a reverse osmosis filter?

I'm considering getting a "comfort pump" which will pump water from the hot line to the cold line under a sink so that there is no waiting for hot water, as well as saving the wasted water. My ...
2
votes
1answer
1k views

Why won't my gas water heater light?

Everything was working last night but no hot water this morning. Things I have checked: gas supply to the house is fine electricity is going to the boiler fuses are good sounds like the water pump ...
2
votes
2answers
1k 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 ...
0
votes
1answer
275 views

Can I repair the floor in the water heater closet with an old street sign?

Can I use an old aluminum road sign as a replacement floor for my hot water heater closet? The old floor is rotten and has some give to it right where a portion of my hot water heater sits, and my dad ...
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2answers
3k views

How can I stop the boiler from heating the radiators when only hot water is wanted?

I have Baxi Boiler (model unknown at this precise moment in time) which British Gas have fixed up to a seperate control panel (see image - not our actual panel, image from Google!). The problem is ...
1
vote
1answer
266 views

Replace under warranty Bradford White or get a new Rheem water heater? [closed]

I have a Bradford White water heater that is about 4 years old, still under warranty, and has started leaking. My understanding is that it must be replaced. The plumber I contacted about this told ...
1
vote
2answers
200 views

Can I replace my oil-based water heater with several electric ones?

I was looking at this question, which is somewhat related to mine but didn't give me a good answer: How to evaluate the suitability of an electric tankless water-heater Basically, my mom's water ...
8
votes
1answer
149 views

How to evaluate the suitability of an electric tankless water-heater

I'm trying to evaluate if an electric tankless water-heater would be suitable for my home. There are just too many variables to consider, and I wonder if there is a mathematical approach to it. I'm ...
4
votes
3answers
2k views

Should we turn our oil hot water heater off every night?

My husband and I are considering shutting off our hot water heater from 8pm to 8am every night to save on energy. Is such a time frame long enough to create a noticeable difference in our oil bill? ...
4
votes
3answers
6k views

Is a gas water heater safe in a bedroom?

My existing water heater is electric and is likely to need replacing soon. The heater is in a converted garage that I use as a guest room. As the house is piped for gas, I'm considering the purchase ...
4
votes
1answer
605 views

What could cause a clicking noise in an electric water heater?

I get clicking sound from our electric water heater as well. it lasts for a while, then stops...then starts again, etc. we recently had technician out who said it needed to be cut back on the setting ...
3
votes
1answer
410 views

Can I reuse cold water copper pipes for hot water?

I have a segment of copper pipe for supplying cold water to my gas heater currently. It runs inside a wall so I don't want to replace it. Now I need to change the piping and want to reuse that ...
4
votes
3answers
484 views

Calculate savings from/cost-effectiveness of installing a tankless hot water heater?

Following up on "Which water heater types do you recommend?" and "Are tankless water heaters worth it in cold climates", is there a way to calculate the point at which installing a tankless water ...
2
votes
2answers
6k views

After installing expansion tank, massive buildup of pressure then a trickle?

I am completely stumped. You guys helped me out a lot with my previous question here: New gas water heater dripping relief valve, have expansion tank, what gives? Turns out the expansion tank ...
2
votes
1answer
282 views

What could cause the hot water not to work after replacing a water heater?

I replaced my hot water heater and now the hot water doesn't run in any of my faucets. What could be the problem? I did not have to replace any piping from old hot water heater and the water ran fine ...
4
votes
1answer
3k views

Are galvanised steel pipes suitable for supplying hot water?

I am living in an old building where the old galvanized steel pipes are still in use indoors. Rather than upgrading to copper pipes, can I reuse these galvanized steel pipes for hot water (from a ...
1
vote
2answers
394 views

Sizing DHW expansion tank for tankless heater

I have a combined boiler for hydronic heating and DHW. Earlier in the winter, I started insulating as much of the pipes I can easily access. This has led to hot water coming out of the cold water ...
0
votes
0answers
256 views

Running Shower Faucet After Hot Water Heater's Off

I was awoke by a chemical smell from my electric hot water heater. The past two weeks I noticed my shower was not getting/staying very hot during my 10 minute showers. Thinking not too much about it, ...
2
votes
1answer
530 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 ...
4
votes
3answers
461 views

Replacing a hot water heater: tank or tankless?

We've lived in this house for 20 years and the hot water heater (tank style) was 2 years old, as was the rest of the house, when we moved in. In the last year or two we've started to have occasions ...
2
votes
1answer
1k views

Is corrosion on top to an otherwise working electric water heater dangerous?

I moved into a house with an electric hot water heater. The heater is old (11 years) but works just fine. However, the top of the tank has extensive corrosion, especially around the connections for ...
5
votes
3answers
1k views

Are hot water returns worth putting in?

Once I saw on an episode of This Old House that they were putting in hot water return lines: pipes that recirculate idle hot water back to the heater so you get hot water right away, instead of ...
4
votes
1answer
2k views

Why won't my water heater stop filling?

I noticed tonight that my water heater appears to be trying to fill with cold water, but it won't stop. I can hear water flowing through the pipe, and the overflow drain pipe (white one just above the ...
0
votes
1answer
789 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 ...
3
votes
1answer
2k views

Water heater builds up excessive pressure only when reheating the tank. What's going on?

The pressure release valve on my water heater will trip predictably after a significant amount of hot water has been used (e.g. dishwasher, laundry, long shower) releasing 16 oz or less of water. It ...
3
votes
2answers
493 views

How can I identify the source of a leak at the hot water heater?

My water heater has a slow leak. From what I can tell so far it is coming from either the cold water inlet or the hot water connection. The cold water inlet seems to be the culprit to me because that ...
3
votes
1answer
387 views

How well would a hydronic furnace work with a gas tankless water heater?

My current heating system (in Ontario) is an oil hot water tank in a closed loop with a hydronic forced-air furnace (Enerzone XAH 68). The water circulates through what is basically a heat exchanger ...
5
votes
4answers
1k views

Why do I have two parallel gas pipes?

I've got a water heater and a hot water radiator furnace sitting next to each other, both on gas. The strange thing is that there are two parallel gas lines feeding each one of these which come from ...
2
votes
2answers
704 views

Hot water stops flowing after clunking noise

When I turn the hot water on in the bathroom faucet, a clunking noise sounds, and the water stops flowing. If I open the faucet quickly, it happens immediately. If I open the faucet slowly, it takes ...