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
4k 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 ...
4
votes
1answer
3k 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 ...
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2answers
516 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
1answer
983 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 ...
2
votes
3answers
7k 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 ...
3
votes
1answer
865 views

How can I prevent water from entering through water heater/furnace exhaust vent?

I have an exhaust vent in my basement (Amerivent Type B) which takes the exhaust from my gas furnace and water heater goes out the basement wall, and up my chimney. A little bit water is coming in to ...
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 ...
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votes
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 ...
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2answers
15k 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? ...
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2answers
534 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 ...
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2answers
1k views

What is the proper way to clean a water heater?

I have heard many times that it is good to clean your water heater about once a year by flushing it. I went to look online to find the proper way to do so and found many people recommending different ...
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2answers
711 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
446 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 ...
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votes
2answers
10k views

How does Thermal Release Device (TRD) work

Rheem hot water heaters have a device in the combustion chamber called Thermal Release Device (TRD). It contains a vial filled with liquid that seems to be mounted in a flex metal plate. It is a ...
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vote
1answer
408 views

How do I diagnose a hot water recirculation problem?

We have 2 ganged gas water heaters in a 10-year-old house. Professionals installed them last year to replace the 10-year-old pair. I'm pretty sure they are hooked up to a recirculating pump. This ...
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votes
2answers
433 views

What type/thickness of drywall should be used in water heater closet?

I have a rental house built in the 70's that had severe water damage in the small room (4x5 feet) that houses the hot water heater. The room is off of the garage. I've had the water heater replaced ...
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votes
3answers
4k views

How does a water-heater know when to turn on?

Now that it is getting colder, we have noticed that when we get home from work, our water is not that hot. It was warm at best after a four-day trip. The water heater is in an unheated basement, ...
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vote
1answer
480 views

A boiler and a hot water tank … what is this configuration? (UK)

I'm a west-coast American living in London. I grew up with baseboard and central forced air heating. I'm currently living in the UK where water radiators are common (if not pretty much the ...
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votes
4answers
16k views

Why does my kitchen faucet have low pressure after the water heater was replaced?

I recently replaced my water heater, and since then, the water pressure for my kitchen faucet is really, really, low. None of my other faucets seem to be affected (bathroom, shower, etc.). I can't ...
3
votes
1answer
424 views

Should I run two gas water heaters if I don't need to?

We purchased a house recently that has two water heaters(configured in series). I just realized that the first one hasn't been running as the thermocouple was defective. For 6 months we had no problem ...
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votes
2answers
2k views

What caused a burn mark near my hot water pipes?

I was doing some household cleanup in the storage room where my heat tank is located when I noticed a burn mark on the wall frame near the pipe that goes from the heat tank to the shower next room. ...
2
votes
1answer
3k 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 ...
7
votes
3answers
61k views

Why is my hot water running out quickly regardless of other household water usage?

I've noticed that my shower, which used to run hot water for what seemed like forever, now can only produce about 15 minutes of hot water. This doesn't appear to be related to other water usage in the ...
4
votes
2answers
2k views

Do I need to replace my hot water tank's pressure release valve?

Recently we had an extended water outage. When water came back, pressure in the lines was much higher. The hot water heater started leaking from the pressure release valve and after flipping it a ...
6
votes
1answer
3k views

Why won't my water heater blower shut off?

My water heater has a blower attachment that kicks on when the water heater begins to heat water and shuts off when it is done. I'm no water heater expert, but I believe that these actions are ...
9
votes
4answers
15k views

Why will my pilot light on the gas water heater not stay lit for more than 15 minutes?

The pilot light went out on my gas water heater. I followed the instructions and had it lit three times now for about 15 minutes each time but it wont stay lit. Not sure what to do at this point?
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3answers
1k views

What failure modes are there for electric water heater elements?

What would be the cause of the elements to go out in my electric water heater? My wife is convinced that it's because the water heater hasn't been drained/flushed in the past 3 years. I was also ...
5
votes
3answers
9k views

Is it time to replace my 20 year old water heater?

My water heater (gas) shows a date of 1991 on it, although the house was built in 1993. There is nothing wrong with it. It is a little slow to heat the water up, sometimes taking almost 5 minutes to ...
2
votes
1answer
299 views

Can I use a small propane instant hot water heater for a clothes washer?

I would like to set up a clothes washer in a location that has only cold water. (It will be in a makeshift shed of some kind, with a hose and an extension cord.) I could just wash everything in cold ...
5
votes
1answer
146 views

Flush a gas powered water heater, not sure if it's ever been done in 15 years. Will it survive a flush?

I'm concerned that there might be seals that are bad, or corrosion keeping things waterproof. It looks great on the outside, But I don't know how efficiently it is working - I've never owned a home ...
4
votes
1answer
583 views

Local “point of use” hot water heater

This question is a follow-up to It takes a minute or more for the water to become hot from any of the faucets in my house -- how can I speed this up?. I have a tankless water heater, and it takes ...
3
votes
2answers
13k views

troubleshooting a hot tub/spa that won't heat up

We have a Hotsprings/Watkins brand hottub/spa that came with the house we bought last September. At the time that we bought it, the hot tub appeared to work and heat up properly. However, now that ...
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vote
1answer
692 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 ...
5
votes
2answers
9k views

Should water heater thermostats be set to the same temperature?

Should the top and bottom water heater thermostats be set to the same temperature? I did a quick google search and saw all kinds of differing opinions. for instance, this guy seems like he knows ...
4
votes
2answers
13k 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 ...
4
votes
1answer
146 views

Is it possible - setting thermostat based on a seperate thermometer

I'm looking into building a solar water heater, but I'm wondering, is it possible (and what products should I be looking for) to turn on a pump when the water in the solar heating device is hotter ...
2
votes
2answers
878 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 ...
3
votes
1answer
1k views

Is it OK to have a gas water heater in a bedroom closet?

I have a laundry room with a gas water heater in the closet. I was thinking about taking out the washer and dryer and renting the laundry room as a bedroom because there is a bathroom next to the ...
2
votes
1answer
1k 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 ...
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 ...
4
votes
1answer
5k 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 ...
0
votes
1answer
236 views

How to calibrate continuous water Gas Heater?

i have installed a gas continuous water gas heater, it is around 30 mts of pipe away. my shower has a mixer valve (one unique lever for both the hot and cold water). The problem is, whenever I am ...
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vote
2answers
177 views

I want a cheap solution for water heating, maybe even something I can build myself, please give me some ideas

I have a little problem, over summer we choose to run a wetback for our hot water, on some days over summer this is unbearable, please provide some helpful suggestions, things like solar ovens, solar ...
4
votes
3answers
508 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 ...
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vote
1answer
496 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
264 views

Is it safe to simply replace a heating element in an electric water heater?

The bottom element in my water heater burned up. I took the bottom panel off, and everything inside was scorched - the insulation, the plastic cover, the thermostat - even the edges of the panel. The ...
2
votes
1answer
167 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 ...
4
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3answers
3k views

Rust spots on water heater — time to replace?

So I noticed today there's some rust spots showing up on the outside/bottom on the water heater. No more than a couple specs. Should I be worried?
2
votes
1answer
927 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 ...
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votes
2answers
3k views

What are the symptoms when 1 of the electric water heater elements goes kaput?

I suspect that something has gone awry with the electric water heater. We do get water that is plenty hot, but it doesn't seem to last as long as it used to. My suspicions are further aroused because ...