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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3
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2answers
219 views

Replacing toilet shut-off valve and need to turn off water; Need to turn gas water heater to pilot?

I'm replacing a toilet shut-off valve (clean water flowing into tank) on the first floor of my (100-year old) home. I'm reading that I need to shut off the water, then drain the lines, before making ...
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1answer
31 views

A newer gas hot water heater keeps getting colder. Where is the first place to look?

We had a new hot water heater installed 1-2 years ago. It worked great up until about 2 weeks ago, where we all noticed that it no longer was heating to the same temperature. I can continue to crank ...
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1answer
15 views

New Rheem RTG-84-XLN-1 Error 12

I just installed a new Rheem RTG-84-XNL-1 tankless water heater. The unit has been throwing error code 12 off and on since it was first run. The manual and their tech support only entertain the idea ...
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2answers
460 views

What does 4/2 AWG with ground mean

My electrician is installing a tankless water heater he told me to get 4/2 AWG with ground for 240v. I went to Home Depot and they have no idea what I’m talking about. Can someone tell me what I need ...
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0answers
13 views

Can't determine which direction to install heat trap

I'm installing a new 75 Gallon Rheem water heater. It came with two valve heat traps, that were not pre installed, and I cannot determine how to installed them correctly. These heat traps are not ...
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3answers
47 views

Water heater not as hot when first bought (only 4 years old) even after flushing

My water heater is set at the default 120F temperature, I bought it 4 years ago brand new, and I remember for the first 2 years of use I would turn my shower faucet valve (located upstairs) to the ...
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1answer
16 views

Water turns cold after water heater circulation pump is off

I have Rheem water heater and newly installed circulation pump. I am facing a weird situation with the circulation pump which is that the circulation pump is set to run between(4PM-9PM). When I take ...
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0answers
15 views

Replacing flow switch on Titan water heater

I need to replace the magnetic flow switch on my Titan tankless water heater...Do I insert it from the side like the diagram shows, or do I need to open the panel?
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1answer
37 views

Turn off water supply but leaving heat burner on?

If a house has a water heater for hot water, and a burner for heat (natural gas, baseboard heating). When one goes on vacation in winter and turn off water supply to avoid frozen pipes, should they ...
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0answers
31 views

Will a standard wifi enabled light switch between an indirect water heater and the furnace stop the heat call?

We have a Honeywell thermostat on an indirect water heater that ties to one of the zones on a furnace in a vacation home. I'd like to be able to stop the call to heat the water if the house will be ...
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1answer
40 views

Water heater tank - the upper of burner is rusty - will it leak soon?

I found the rusty and drip on burner, please refer the pic. My question is: will it leak soon from the rusty place? It's really scare me when I saw it. And, the water heater is almost 20 years I think....
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0answers
20 views

Hot water only when multiple sources turned on

When one hot water source is turned on, the hot water is only lukewarm. But as soon as another source is simultaneously running, the water runs hot. For example, the kitchen sink runs cold, but if I ...
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1answer
28 views

Replace breaker For hot water heater

My tankless hot water heater went out & is on, I believe, a double 60 amp breaker. My plumber says the new one needs a 50 amp breaker. Can I just swap out the 60 amp with a new double 50 amp ...
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0answers
31 views

Why does my water heater heat past the set temperature?

Rheem Marathon 85 gl electric water heater set at 120 degrees started putting out scalding water. Thought it was the thermostats so replaced both. Didn't have any effect! Anyone have any ideas?
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2answers
601 views

Pressure relief valve stuck - leave alone or force it?

Have a Rheem "Everkleen" 50gal water tank. Water is heating fine, but fear ive let it go too long. Have not drained it since the house was built in 2008, yet another thing Ive discovered ...
2
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1answer
62 views

How to extract heavily corroded anode rod?

I obviously waited too long to replace the anode rod in my water heater, because after finally (with much cussing) getting the rod unthreaded, I found that it was so heavily corroded that it won't fit ...
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1answer
32 views

Do I have a bad heating element in my electric boiler?

I have a Dettson Hydra20. Two days ago we woke up to 17C inside the house instead of the 21C set on the thermostat. The water temp on the boiler was at 40C and not moving. I also have a gas fired ...
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0answers
8 views

Water protection on top of heat pump water heater

I just got and installed one of those new heat pump water heaters. I was able to plumb the cold and hot fittings to the side because the top has an air inlet and a heat exchanger, but there is some ...
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3answers
94 views

Should I keep my 5-year-old electric tank heater as a storage unit if I am about to install a new gas tankless heater?

A plumber recently told me that its perfectly common to keep the old 40 gallon tank water heater in series with a new tankless water heater. The motivation is to decrease the time it takes to get hot ...
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1answer
53 views

Tankless Water Heaters in Series

I am building an addition with a basement underneath. The existing home is on a slab foundation, and the 20 year old tank water heater is in a closet. I was planning to replace this water heater ...
2
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2answers
101 views

why is 4500 watts so common in water heaters?

It seems that the default for electric storage-type water heaters is two 4500watt heating elements, wired for non-simultaneous operation. I'm curious why that is. Water heaters are typically on 30amp ...
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2answers
104 views

Water heater on 30A breaker with 12/2

The water heater that came with my home when I purchased it is on a double pole 30A breaker and wired with 12/2 romex. The breaker seems to be sized correctly for the wattage (4500W) but should it be ...
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0answers
36 views

Brand new water heater not working

We just brought a new water heater and everything inside such as elements and the thermostats are all perfectly working. The wiring is all good and the connections are all good but the water heater ...
34
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2answers
2k views

How can we dry out a soaked water heater (and restore a novice plumber's dignity)?

Suppose a novice plumber -- a completely hypothetical novice plumber -- removed the top heating element in their electric water heater before the tank had sufficiently drained, resulting in about a ...
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3answers
115 views

How can I mix tank and tankless hot water to feed my bathroom?

We are doing a master bathroom renovation and are considering adding a tankless hot water heater to supply just that bathroom. Our current 50 gallon hot water tank runs out after about 2.5 consecutive ...
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1answer
23 views

Hot water always coming after cold in vented tap system

I moved to an apartment in Luxembourg (which uses german-style plumbing) with a vented tap kitchen sink. The issue I'm having is that when I close the tap after using the cold water, for a few seconds ...
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1answer
49 views

Cold water from water heater

I have a Rheem natural gas water heater. The hot water was accidentally left running in the bathroom sink overnight for about six hours. Nine hours later the water from the faucets is cold. Why? Now ...
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2answers
70 views

Wiring size for 75-foot run from 40 amp breakers to tankless water heater?

I am planning out my future tankless water heater install. What type of wire will I need to use for a long run from my 40 amp breakers? Heater will be 240v and about 50-55 feet from the panel. I'm ...
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1answer
50 views

Will condensation form and be an issue on an aluminium duct venting water heater exhaust?

I have built the unfinished chimney shown in the image below to get the exhaust for my neighbor's water heaters (which I believe are sealed combustion gas appliances, such as the Remeha Avanta water ...
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2answers
31 views

Preventing Water Heater Leak?

I’m about to close on a house next week and the water heater is located in the attic. It’s 17 years old and I’m nervous about the damage it will cause if it ever leaked. I want to replace it with a ...
2
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0answers
55 views

Why do water heaters get up to 12 year tank warranties in consumer stores, but only 10 year in supply warehouses?

I'm looking at gas tank water heaters sold in home improvement stores (Rheem Platinum at HD, AO Smith ProMax series at Lowes) and they offer up to 12 year warranty for their top models. Meanwhile ...
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0answers
72 views

Water heater not producing hot water but everything seems to be working?

We just bought a house and the previous owner had a brand new water heater installed. The first day we took a shower it was not very warm and the next day there was no hot water at all. I checked the ...
2
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2answers
90 views

Is it safe to set my water heater tank to vacation during winter time? What else can I turn off to save heating bills during winter?

Is it safe to turn set my water heater tank to vacation during winter because I am mostly away from my house? I live in Canada. What else can I turn off to save heating bills during winter when I am ...
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1answer
45 views

How will a hybrid water heater perform in less than optimal conditions?

I'm thinking of getting a heat pump hybrid water heater (this one maybe); The operating conditions will be technically within the prescribed range but less than optimal. I'm wondering how I should ...
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1answer
36 views

Energy saving box on an old whirlpool hot water heater

There is an energy saving box on an old whirlpool hot water heater in an old house we purchased. I changed both elements out yesterday and it worked fine. Had hot water in about 2 hours. Now tonight ...
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0answers
32 views

Fixing a leak in water heater pipe joint

I had a new water heater put in and discovered a slow drip at the joint where the hot water pipe from the heater connects to the house piping. The installer claimed that he didn't touch that solder ...
0
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1answer
142 views

Can a water softener be installed after a thermal expansion tank? [duplicate]

Our thermal expansion tank is installed after the meter and feeds into the house and hot water heater. It seems like it should have been installed immediately prior to the water heater... Can I ...
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0answers
48 views

What copper tube adaptor is this?

This is from a tankless water heater with about 1/4" copper tube. Is the adaptor standard (encircled in blue)? What type is it?
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1answer
123 views

Heating above ground pool by re-circuplating pool water through tankless, on-demand water heater

Due to covid-19 all indoor pools in my area are closed for the foreseeable future. Kids being swimmers, I purchased an Intex 15' round above ground pool and installed in it in the garage. It worked ...
0
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1answer
34 views

Hot water heater and gas-stove not working at the same time

So I have a gas water heater and a gas stove. I was able to cook on my stove this morning at around 8 a.m. and then I took a shower and it was not hot. I tried to light the pilot on the water heater, ...
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0answers
38 views

Is it safe to use timer to shut off gas boiler overnight?

We have an aquaPLUS 280-7 r3 Valliant gas boiler. It heats the water nice and all, but it has an annoying habit of turning on overnight to preheat the water in the storage container. The problem is, ...
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0answers
18 views

Lukewarm water from solar cyclinder heating system

I have a dimplex solar heating system with a water cylinder. Been fine for 5 years but in recent weeks even with hot weather I'm getting 15 seconds of hot water in the kitchen and then lukewarm water ...
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0answers
29 views

Gas water heater not heating water

A friend of mine is having problems with his gas water heater. He sent me the info below so he did try and determine the cause. It troubles me that he had it "go out" several times a year. ...
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2answers
54 views

What are the downsides to a DIY heat exchanger on my shower drain?

I have a shower stall built into a bathroom. It will not accept a tub in its current incarnation, so this applies to showering only. Outside of the hassle around fabrication, what are the downsides ...
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0answers
23 views

Purpose of pressure control valve in multipoint water heater

Most instant tankless multipoint water heater has plastic pressure valve where you can control the water pressure either in the inlet or outlet (by turning the scew below). If you make the flow weaker,...
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1answer
32 views

Multipoint water heater using real 1/2" pipe

A multipoint water healer is connected using flexible hose. This has 1/2" in the connector only but very tiny inner hose (less than 1/4"). What would happen if you use real 1/2" or even ...
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3answers
79 views

Resource comparing power consumption of different water heaters?

I am looking for a website the compares the "real-world" energy consumption of different electric tankless water heaters under different conditions. Any ideas?
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1answer
72 views

How to keep my tankless water heater safe in a cold room?

I have a room in my apartment that can sometimes get around 40°F (4°C), and that's where my new tankless water heater is installed. Should I take any special precautions to keep my pipes from freezing ...
0
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1answer
51 views

How to reinsulate a water heater ignition wire?

My water heater ignition wire's insulation melted off below the insulating base of the electrode, so now the spark gaps across to a nearby metal bracket instead of gapping across the electrode. I need ...
0
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1answer
27 views

Can the water supply pass through a water heater before the expansion tank?

I can't find anything on the piping placement of an expansion tank relative to the water heater. All the pictures I find shows the intake from the wall to the expansion tank and then to the WH. The ...

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