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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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Inconsistent hot water

We are currently doing a full en-suite bathroom remodel. About 2 weeks ago all of the plumbing was completed and about the same time we noticed that we weren’t getting as hot of water in the other ...
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48 views

I have two water heaters - how can I tell if they are set in series, parallel, or are isolated?

The question says it all - I have a 4,200 sqft house with two water heaters - one on the far side of the house in the garage and the other in a small closet by the master suite. The latter is at least ...
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1answer
41 views

How to check and turn on pilot light of this water tank?

I have never done this before but the gas line was turned off briefly and now we have no hot water. Look like the pilot light went out on this but I have no idea how to see the light and how to turn ...
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2answers
29 views

Rheem Hybrid Water Heater Dead

My one-year old Rheem Hybrid Hot Water Heater (xe50t10hd50u0) is completely dead. Power to the unit is good (full 240v). Screen on the unit is blank. I've pressed the reset button; no help. ...
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38 views

Very new water heater makes a cracking noise

A very new water heater (2 months) makes a cracking noise or two every time at end of the heating cycle. Is that a problem? There is a softener on all incoming water.
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30 views

Best/Quickest way to drain hot water lines from tank?

Due to serious lack of appropriately placed shut-off valves in my house plumbing (not my fault, it came that way), I need to shut off the cold water supply to my gas hot water heater so I can replace ...
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1answer
20 views

why won't my shower regulate water temperature

a couple days ago this started. no matter what position I turn the handle towards the left it's always very hot. and the same if I turn it to the right. very cold. I'm assuming there must be some sort ...
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2answers
52 views

PEX and Hot Water Heater install

OK here's my dilemma. I need to replace my existing low boy hot water heater next to my kitchen sink. It was installed by the builder ten years ago. All the pipe in the house is PEX. The existing ...
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28 views

Do I need to replace the water heater vent pipes if they have salt corrosion?

I was in my attic improving the insulation and I found that my exhaust pipe for the water heater has salt/corrosion all around the seams. Based on what I found, this is either caused by inadequate ...
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1answer
20 views

Extend sidewall hot water tank vent outside?

I have a power vented hot water tank just on the other side of the wall (and in the basement) from the exterior pipe you see in the picture. The problem is that the steam vents onto my wife's flower ...
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1answer
79 views

Water heater requiring 30A breaker running on 20A

I called a plumber to upgrade my water heater. The current breaker is a 20A. The new water heater requires a 30A. But my wiring is #12. The plumber said, without much conviction, that it's fine for ...
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water heater draining hot water continuously from an outlet (seems tp valve outlet to me) [duplicate]

My gas water heater, continuously lets hot water out from the outlet (seems it is connected to tp valve, it goes through the wall to outside the home). If I turn the water heater to low (much below ...
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2answers
59 views

Where to turn cold water off inside the house?

This is somewhat a newbie question as I just bought this house. I assume design of plumbing must be common. So I wonder if I miss something. Below is the "green" valve to shut off hot water into the ...
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3answers
72 views

What breaker configuration does my new on-demand water heater need?

I purchased a on demand water heater.my old heater is hooked to a 20 amp breaker(see photo). Do I change out old breaker to a double-pole 60 amp breaker or do I have to move connection to a different ...
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2answers
116 views

What does it mean to drain into a “laundry tub?”

In the USA my American-made tankless water heater's install manual says that the condensate line can empty into either a drain or a "laundry tub" and then continues to explain that leaving laundry ...
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1answer
87 views

In-floor radiant heating hooked up to hot water tank in new home - questions about how it works and operating it

I've moved into a new 2 story house. The heating system is in-floor water heating, and the heat source is an electric hot water tank. I'm hoping you guys can help me figure out how the system works ...
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1answer
89 views

My hot and cold water are connected in the output of my water heater

Never seen this before, the Cold water is connected to the hot water for the output of my water heater. Any idea what this is?
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1answer
37 views

What is required clearance from mechanical exhaust to garage door?

I'm looking to add a new tankless water heater, which allows for pvc exhaust. In California, USA, I think clearance requirements for a door is four feet horizontally or one foot vertically. Does this ...
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1answer
47 views

Hot water heater T&P discharge going into furnace condensate pump?

I recently had some electrical work done at my house, and as part of that, the power was shut off. After a few minutes, we noticed water coming from the closet containing the hot water heater and ...
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35 views

Is it normal for the sight port of a water heater to ever have condensation in it?

Is condensation in the sight port ever a "normal" occurrence? Or does that mean the pan at the bottom is flooded. I only see condensation, and it won't stay lit. I called plumber out, and he said ...
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28 views

No hot water in only one bath tub

We are not getting hot water in only one bath tub. The left side is for hot water and right side is for cold. There is no drop in pressure when I turn on only the left side. But instead of hot water ...
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1answer
18 views

Trying to identify cause of minor leak from water heater TPR valve

A few days ago I noticed about a capful of water in the pail at the bottom of my water heater's TPR valve outlet. This is the first time I've had any water come out of the TPR when I wasn't testing ...
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1answer
79 views

Turning water off to house for a vacation, does furnace need to go off as well?

I am going away for a week, I want to shut off all water to my home. I have an oil furnace, with a separate water boiler (connected to the oil furnace - there is no gas in the house). It is summer in ...
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1answer
206 views

Got Red Tag warning from gas company for hot water tank (Canada)

Gas company technician asked me to take a look at hot water tank and there he issued me Warning B Red tag and gave me 5 weeks to fix the issue. Issue in related to clearance from combustibles (TSSA ...
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1answer
34 views

Gas Water Heater will be permanately out of service

Gas Water Heater will be permanately out of service. Pilot & Gas is shutoff. Should I drain the water or leave it or does it matter at all?
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53 views

Why does my water heater stop heating when some outlets don't have power?

I just bought a house 2 months ago. The water heater has been working fine until now. We experienced some receptacles in our kitchen coming in and out (meaning they'd work and then quit, work and then ...
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1answer
39 views

Hot Water issues in entire apartment, How can I fix this?

We lease an apartment and the maintenance has been less than effective at fixing this issue so was wondering what other people think about it. We've got 2 showers and 3 sinks, this issue is happening ...
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2answers
32 views

Separate or combined boiler and hot water heater

I'm looking to replace my boiler and hot water heater. For background, I live near Boston, my home is about 2000 square feet, we have gas for heat, stove, and dryer, and we are two people in the ...
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1answer
29 views

Under Floor Heating (Wet) - pipe coupler under the screed?

I want to fit UFH to a whole house - normally it would be an easy process if one could just move out and live somewhere else as the whole house gets gutted and re-done. However, ideally, i want to fit ...
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2answers
43 views

Water hammer, PRV, and safe water pressure at water heater

Our main water line into the house was making a loud whining noise whenever a shower was on, so we had a plumber come out and they decided to replace the PRV (which appeared original to the 1970's ...
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36 views

Condensate Neutralizer Refill

For a tankless water heater and whole house boiler there is a neutralizer installed in my boiler room. It has not been refilled in more than a year. After some research I found out that I should use ...
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4answers
89 views

Gas-fired water heater safe to have in living area of home?

A un-licensed renovation on our house was performed about 15 years ago, which turned a former garage into a 200 sq ft den directly attached to the rest of the house. In this den is a gas-fired water ...
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37 views

Gas Water Heater Problems

I left my hot water on all night by accident. Now the water is EXTREMELY hot and the floor above the water line is warm. When I turn on the cold water, the first 10 seconds or so, hot water is coming ...
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2answers
215 views

Water heater flush yielded almost no sediment

I did a water heater flush by turning off my heat down to the pilot light only and setting it to pilot instead of on, let it sit overnight. I then opened the stock drain valve and let it drain until ...
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1answer
293 views

energizing both elements of electric hot water heater

I'm considering using an electric hot water heater (EHWH) with upper and lower heating elements as an electric diversion load. This EHWH would be for pre-heating the water bound for the standard HWH....
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1answer
256 views

Have Gas Water Heater…Wondering If It Needs to be in a Closet

I received a "gift house" from my father-in-law a few years ago. A lot of the problems have been repaired over the past few years, but I have a major one that keeps kicking my butt. The previous ...
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1answer
295 views

Will an expansion tank and water pressure regulator work over periods of non-use?

I have high water pressure coming into my house (~110psi) and a backflow preventer at the source. I do not currently have a pressure regulator or an expansion tank installed, though I'm considering ...
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1answer
77 views

Parallel Water Heaters, One Doesn't Run

I have two water heaters (different brands) running in parallel. When I run hot water in the house only one tank will drain while the other sits there full. I have manual shut off valves so if I close ...
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1answer
37 views

Water heater wont work

My gas water heater wont heat until I turn it up to nearly all the way to the maximum temperature, indicated with letter "C" in the image. If I turn it down lower than "C" the gas flames stop and the ...
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20 views

New (combi) boiler: should I go for integrated or detached hot water thank

I got some estimates for a new boiler, price is almost the same, but one comes 'split' in two: the 'burner' on one side (that includes the 3-way) and a 80L thank. Other is a 'combi' that has both ...
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1answer
31 views

Best Water-Heater Location

Is it OK to install a gas water heater next to a gas dryer and if not what are the cautions? Both will be vented. Thanks
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1answer
34 views

Copper reducer before hot water heater

My house copper lines are 3/4 in and my new water heater accepts 1/2 copper in a compression connection. Is there any issue with adding a 3/4 to 1/2 reducer before and after the heater?
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1answer
45 views

what is a reasonable amount of condensate water produced by my pump?

I have a Ruud hi-efficiency furnace and also a Ruud tankless hot water system, both with condensate lines running down to the pump. My problem is... the pump runs (intermittently) ALL day long..lol.. ...
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2answers
55 views

Slow faucet when water gets hot

I appear to have a strange problem. For the last 6 months, at least, in my master bath the sink faucet pours slowly when the hot water reaches the faucet itself. That is, If the pipes have cooled ...
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2answers
99 views

Can I connect an Asian 240v water heater to a US 240v circuit?

How can i wire directly an Asian single 240 volt line with neutral instant hot water heater to my 240 twin line tap in the United States? Can i tie the two legs on the breaker into a single wire? I ...
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3answers
347 views

Why is my water heater's relief valve popping?

I haven't seen it, but there is water on the floor and also on top of a hose that is rolled up next to the water heater. It is a A.O.Smith electric ECS 40 200. Both upper and lower thermostats are ...
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163 views

Why with new hot water heater and now master shower hot water runs out fast?

We bought a new hot water heater 6 months ago and it was working great until recently. Lately, only in the master shower the hot water lasts for only a few minutes then cold. Sometimes it won't even ...
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1answer
83 views

What is the effective difference between an inline air separator vs a air vent at the high point in a recirculating water system?

My tankless water heater manual suggested the recirculating set up shown here: It appears there are 2 air vents, but one is attached to an air separator. Do I need both an air vent upstream of ...
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Removing Seized Anode Rod From Water Heater

We have an electric hot water heater (GE branded Rheem) that may date from the mid-90s (based on the energy usage tag). It was boxed in and I was finally prompted to open up the wall concealing it ...
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which element is defective on a hot water heater

It looks like my lower element on my hot water heater is not working as I have luke warm water, and if I use a lot of the luke warm water, next time i use water it is very hot for awhile. Then goes ...