Questions tagged [water-heater]

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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Why is my gas water heater not getting as hot since I added new lines to a new shower [closed]

I recently added a new bathroom. New shower and vanity. I tied in and added one more 8ft run of pipe, hot and cold, to supply this bathroom. All the fittings are good and I can't see any obvious ...
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1 vote
3 answers
157 views

Hot Water Heater Relief Valve Leakage

I moved into my house a few years ago and did not realize I needed to occasionally test my hot water heat relief valve. I had never tested it before today. I also have never had any problems with it. ...
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Why does my pilot light go out when the main burner shuts off?

My water heater pilot light goes out every time the main burner shuts off. I have replaced the pilot assembly with new thermal couple gas lines to the control and pilot (the assembly came all together ...
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2 votes
1 answer
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Tool to unscrew or remove the top portion of pressure regulating valve buried in ground

The pressure regulating valves are typically installed right by water mains where I live (in Texas). They are buried 1 ft+ deep and a circular tube is installed for you to access the top screw to ...
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troubleshooting liquid propane water heater, smelling gas

I'm renting a room at my friend's home. We smell gas when the water heater runs. We smell gas outside, near the exhaust but not at the tank or the pipes entering the building. Inside, we can't smell ...
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7 votes
4 answers
3k views

Do tankless water heaters have a maximum temperature limit for the incoming "cold" supply water?

I currently have a tankless, natural gas hot water heater on the side of my house. I want to preheat the incoming water using a solar water heater. Is there any concern with having the input supply ...
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Can you put a 3500W element in a 4500W water heater to run a 20 amp breaker on 12/2 wire?

I have an A. O. Smith 40 gallon 4500W. Can I change the element to 3500W to run it on a double 20 with 12/2 wire?
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My RHEEM Gas hot water tank keeps shutting Off with code 2

The Plumber said it's the gas valve assy. So I ordered a gas valve. After installing, the problem still exist. The plumber even broke the sight glass to "let more air in". After breaking the ...
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1 answer
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Does missing expansion tank and check valve explain non-functioning circulating pumps?

TL;DR: A recirculating pump for hot water was installed and is not working. Looking at the drawings an expansion tank and check valve were not installed. Does this explain why it's not functioning or ...
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1 answer
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Condensate Pump For Water Heater?

I just learned that my water heater can release water onto the floor via a pressure relief valve. I've cleaned up the mess (the valve is working fine, I just didn't notice the tiny cup previous ...
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5 answers
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What kind of water pump should I use to supply a tankless water heater from a non-pressurized water source?

I have a tankless water heater similar to this one, which I'd like to setup at a campsite where I'll have water but not from a pressurized source (e.g. a bucket of filtered river water). The heater I ...
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Do tankless under the kitchen sink 110v water heaters any good for instant warm water? [closed]

I was planning to install a mini tank water heater under the kitchen sink. It's just to be able to wash hands quickly without waiting for the hot water to come in from main heater. I don't have enough ...
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2 votes
1 answer
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How to retrofit this circuit to be able to run a bare ground splice to another appliance?

I'm adding a #8AWG bare ground in order to retrofit a 3-wire range socket into a 4-wire one. I will be splicing into an existing water heater circuit to get the "at least #10" ground that is ...
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Where should I install a Kolerflo 120W water pressure booster pump?

I have a tankless water heater and the water pressure is not enough to turn the tank on demand causing the water in the shower to be just barely warm. I purchase a Kolerflo 120W to boost the pressure, ...
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Why does cold water flow to just one of my bath faucets when the water heater valve is closed?

I currently have a plumbing leak which has caused me to close the gate valve above my water heater unless we need hot water. By doing this, we are still able to use the sinks, toilets, etc. One of ...
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2 votes
1 answer
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What is the white plastic cap on top of water heater for?

I noticed that on the top of almost all gas water heaters, there is a plastic cap (mine has "caplugs bp-2" on it, which may just be the brand of the cap). What is it used for? Can I add an ...
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Okay to use cold water drain valve on tankless gas water heater as a spigot?

I need to use a pressure washer outside my house, but there's no spigot nearby. I do have my tankless gas water heater nearby though, which has drain valves (both hot and cold). When I opened up the ...
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1 answer
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How can I diagnose a water heater leaking through TP valve?

My natural gas water heater leaks about 1/2 gallon of hot water through my TP valve every day. This started about a month ago. Last week I replaced the TP valve with one that had identical specs as ...
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Blue Green Residue from leaking Temperature Pressure Relief Value on Rheem Water Heater

I have this blue salt-like residue coming from a leaking temperature and pressure relief valve. Never seen anything like that in crystal form. Thoughts?
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1 vote
0 answers
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Utility closet mystery sound

Background Hi StackExchange. I live on the third floor of a four-floor apartment building, wherein the ground floor is a currently-unoccupied commercial space and there are six total residential units ...
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-1 votes
4 answers
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Do I have problems with heater [closed]

There's only 15 minutes of hot water. I shut down cold side slowly to extend hot water and it turns hot water cold. What's wrong?
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2 votes
2 answers
598 views

Does this valve control input for my water heater?

Does the red valve on right-most pipe control the water flowing into the water heater? The water heater needs to be replaced, so if the valve is closed to drain the old water heater, it would be good ...
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Water heater pilot goes out after a burn cycle

Having the issue of having to relight the pilot after ever burn cycle. I cleaned the thermocouple, lit the pilot, and watched a burn cycle through the window. This is when I noticed something strange; ...
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1 answer
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After new water heater installed my dishwasher filled with water when not running AND my washing machine trickles water in the drum. Is it related?

Installed new hot water heater by a in experienced plumber. I told him I didn’t use my dishwasher I thought it might have a filter that needed to be cleaned and he pulled it out and said he couldn’t ...
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Do I need to flush my tankless water heater annually?

I bought a Rheem tankless water-heater last year, it is RTG-95XLN-1 model. I was told that I need to flush it using vinegar and circular pump at least once a year, to prevent sedimentation. There are ...
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Can expansion tank be connected to second TP inlet on top of water heater?

This gas water heater (American Standard GSN50T1) has a working T/P-relief valve installed on its side. I also found this unused inlet on top of the heater, under a plastic cover, just above a stamp ...
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Can you use a tankless combi boiler ONLY for central heating?

We're looking into replacing our boiler. The current one is tankless and only provides hot water for heating on a closed loop. There is an entirely separate electric HW tank & plumbing for '...
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I have a state electric hot water heater and everything is working but still no hot water

i have a state electric hot water heater ,30 years old but have always just replaced elements , so when the element went bad this time we replaced it and it worked for one whole day and then it quit ...
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0 votes
1 answer
84 views

Did Dishes with Radiator Water For a Year [closed]

The valves connected between my (serpentine) hot water tank and radiators is broken. Moreover the serpentine is broken and hence the hot water for showering and doing the dishes has been cross-...
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2 votes
1 answer
53 views

Two brand new Rheem instant hot water heaters (gas) randomly don't turn on

I moved into a home with two brand new rheem instant hot water heaters. They both act this way: Randomly, turning on a faucet won't activate the hot water heater, even at 1GPM. You turn on the shower ...
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1 answer
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Water heater tripping washing machine breaker

I just underwent a major renovation and now when my water heater is maxed out, it trips the washing machine breaker on its own dedicated circuit. I upgraded to 400A service with one of the 200A panels ...
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1 answer
109 views

Can we use hybrid water heater for radiant floor?

We have a concrete slab radiant floor that is currently heating by propane tankless boiler (Lochinvar NKC199N), but as you know LPG is expensive and not quite efficient. Now, I am thinking about ...
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Tankless water heater sputtering / putting out water in spurts

Does anyone know why a tankless hot water heater (Rheem ECO200XLN3-1) would put out water in spurts like seen in the below video? This video is taken soon after turning the shower on to full hot and ...
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2 answers
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water softener or filter before hot water heater

I installed a hot water heater in my house about 6 months ago. I recently had to replace a burnt out heating element and thermostat for an unrelated issue. When I replaced the heating element, I ...
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3 votes
1 answer
201 views

How important is it to completely flush a water heater?

Doing my 2nd annual water heater maintenance with the objective to flush out the entire electric tank. I expected a gradual reduction of sediment from the start to the end (completely empty tank). ...
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0 votes
0 answers
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Adjusting water heater that provides both domestic hot water and baseboard heat

I live in an apartment building with in-unit water heaters. Mine is a Weil-McClain Gold CGt gas-fired water boiler with tankless heater. It heats water for domestic use and also for my baseboard ...
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2 votes
2 answers
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Increased water heater temp and now T&P valve leakes

I increased the temperature of the water heater and now every once in a while the T&P hose/pipe will drip. Was I supposed to adjust something there as well? I ensured that the temperature on both ...
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1 answer
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How to Compare water heater recovery specs with different TRise numbers

I'm in the process of replacing my water heater. The only specs I know from my existing water heater are those listed on the label shown below. . At first I wanted to compare FHR specs, but I can't ...
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Noritz Tankless Water Heater Error Code 90

My noritz tankless sometimes shuts itself off with error code 90 - a combustion problem. I’ve had a plumber come out and service it since the previous owners didn’t for ten years. I still get the ...
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1 vote
2 answers
310 views

How can I decrease water flow to tub spout?

Your task, should you choose to accept it, is to help me solve THE HOT WATER MYSTERY! Story: I moved into my house 1 year ago and since day 1, I noticed the bathtub in the guest bathroom had an issue ...
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1 vote
4 answers
252 views

Can I put my water heater under front stairs?

I'm considering buying a 47 gallon Rheem short electric tank water heater: PROE47 S2 RH95. I've worked out the measurements and it will fit under my front steps, about 6' above the garage floor. ...
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0 answers
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Rv water heater turns on when only using cold water at the faucet

Why does the water heater in my camper turn on when I am only using the cold water at the faucet?
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0 votes
3 answers
102 views

Rheem T-Rex 13 tankless water heater 6awg 3 wire 60amp

Can I run my Rheem T-Rex tankless water heater on same 60amp breaker as my 240v dryer? Can I put in a junction box at my dryer area and run power to the tankless water heater?
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1 answer
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water relief valves on water heater

I have an A.O.Smith water heater. The water heater in my garage has a outlet marked "relief valve" on the side of the water heater near the top, but nothing is connected to it. Instead the ...
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2 votes
1 answer
93 views

Diagnosing a non-functioning hot water recirculation system

My house currently has a hot water recirculation system, but it does not seem to be functioning as the water in the upper levels take minutes to get warm. First off, I tried to determine whether I had ...
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2 votes
3 answers
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Does clogged radiators increase the heating bills in a tankless combi boiler setup?

We moved to a "new" apartment and I was told by a family member that all the radiators are clogged like hell and we should get them cleaned ASAP which we never did. What makes me paranoid is ...
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1 vote
1 answer
231 views

Shower gradually cools, gets hotter when sink is on. Navien tankless whole house HWH

Our shower and a few other fixtures are behaving strangely. When I get into the shower it gets hot quickly and then gradually cools. But, I found that if someone else turns on a nearby sink (but not a ...
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0 votes
2 answers
79 views

Should I turn off a Tankless gas water heater during freezing weather if I cut water to the house during vacation

I will be away from home during freezing temperatures. I plan to cut the main water supply. But, I have a Rheem tankless gas water heater on my outdoor wall. If I cut the water supply, should I also ...
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1 vote
1 answer
362 views

Hot water heater causing buzzing/grinding sound in circuit breaker panel

I just installed an AO Smith 50 gallon hot water heater in my basement in May of 2021. It has been working great for the past half year or so. Today, I found that I only had luke warm water for my ...
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1 vote
0 answers
44 views

Mixing CPVC sizes through a heater

I am off grid, and need more hot water pressure. When they built my house they plumbed 1/2 inch CPVC to two showers, 3 sinks and a washer. The reason is the hot water heater has 1/2 inch in and out, ...
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