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
56 views

Switching electric boiler off for months — any precautions?

I have an electril 50-litre water heater (boiler) in an appartement that's going to be abandoned probably for several months. I thought about switching off the boiler's electric fuse to switch off the ...
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1answer
351 views

Replacing water heater gas control valve

First let me summarize my questions, then provide detail: Summary: Can a newer gas control valve be installed on an older water heater? As an individual who has never attempted something like this ...
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1answer
60 views

Why is there no hot water in the kitchen after flushing our water heater?

My husband and I recently moved into a new house that has two water heaters. One is gas and supplies the main portion of the house, the second is electric and (as far as we can tell) only supplies the ...
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4answers
405 views

Leave the water heater on?

When I lived in France and the US, we can an electric boiler for hot water. It was "always on", probably with a thermostat. Now I live in an area where most people have a power switch that they turn ...
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1answer
1k views

Newly installed water heater with faint gas smell

Installed a new water heater last night (Rheem Performance Plus Model #XG50T09HE40U0). All went well with installation (including gas line bubble test), but this morning I could detect a faint smell ...
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0answers
60 views

Checking the pressure in a Megaflo?

I have a Megaflo cylinder, that looks very much like this one: It is fed from a central boiler system in the building (I live in a new build flat, about 5 years old). The Megaflo provides hot water ...
37
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7answers
13k views

How can I speed up my slow hot water?

Our water heater (gas) is located in the garage. It is 25 to 30 feet away from the closest faucet, which I'm guessing is the main reason it takes so long -- a minute or longer -- to get hot water ...
3
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3answers
785 views

Is there a way to get hot water without altering plumbing or electrical wiring too much?

Is there a way (other than collecting water and heating it on the stove ) to get hot/warm water from the tap without having to alter existing plumbing or electrical wiring ?
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2answers
96 views

Hot water heating system: Renew or replace?

Our home was built around 1963 and has Gas powered Hot water based heating, some portion of the house is floor heated and some with radiators emitting heat from hot water. The heater may be 10-12 ...
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2answers
2k views

How should a water heater drain pan be installed on a concrete slab floor?

My water heater sits on a concrete slab floor in my utility room next to a wall with a bathtub drain, and a few feet over from my washing machine drain. When I replace the heater I would like to ...
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0answers
217 views

Clicking sound from water heater after flushing toilet?

Sorry if this question has already been asked but I have a random question about my water heater to see if this is anything I need to be worried about. To start off I live in an apartment complex and ...
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1answer
134 views

Would connecting the downpipe to a gas boiler inlet save energy?

I have a condensing gas boiler for tap-water and central heating. Not very far from the inlet there is a downpipe outlet for the sewer. Since this smelly pipe is partially filled with the same ...
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1answer
390 views

Two Water Heaters - One off affecting the other?

We recently moved into a property with 2 water heaters installed. These were installed less than 3 years ago, so they are relatively new. Now, in an effort to conserve electricity (we are just 3 ...
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3answers
9k views

Why does hot water come from the faucet when only the cold water tap is on?

On occasion, when I open the cold water tap on the kitchen sink, the flow from the faucet briefly becomes warm: it starts cool, becomes warm for about 30 seconds, and then returns to the desired cold ...
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1answer
116 views

Hot water running out, already replaced both heating elements and both thermostats

Our hot water runs out during one not-too-long shower. By the end of the shower, I have the cold water completely off and the hot water coming out is only lukewarm. My husband already replaced both ...
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1answer
98 views

How does decalcifying work, and is it something I need?

We recently had to replace our water heater because of lack of hot water, age (12 years to the day almost) and sediment build up (it was higher than the lower element; we purchased the home 7 months ...
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1answer
191 views

How close can an electric water heater and an electric furnace be to each other?

How close can an electric water heater and an electric furnace be to each other? My water heater is 7 inches from my furnace. I need 4 inches so that I can install a water softener and wash sink. So ...
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3answers
614 views

Does a thermocouple need to be screwed in to work?

I'm recently having trouble with a water heater. The pilot light with ignite just fine, but will go out after releasing the reset button, even after holding it for over a minute. That makes me think ...
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2answers
1k views

Why does pressure relief valve state 'Not for Use with Water Heaters'?

So I replaced my 6.5 year old electric hot water (installed with house built in 06') heater and used an identical plumbing setup as my previous install. My previous (and now current) install has a ...
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3answers
985 views

Combi boiler doesn't realise it's already lit

I have an Ariston Eurocombi (A23). The problem is it doesn't realise the flame is lit. When I start it up and cause demand (run hot tap or turn on heating) it fires up the flame correctly, however, ...
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5answers
520 views

Is it okay to flush water heater onto the drip pan with drain hole?

Our water heater is on the second floor and we need to have it flushed. It has a drip pan with a hole that has a tube attached to it. Common sense tells me that I can flush the water heater directly ...
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1answer
854 views

Desuperheater vs Heat Pump Water Heater

I'm having a geothermal heating system installed in my home, and the contractor recommended heating my water using a buffer tank and desuperheater, which is a device that cools the refrigerant lines ...
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2answers
216 views

How much distance do I need to branch from water heater?

I moved my washer and dryer next to my electric water heater. I would like to know how close to the tank can I branch the hot and cold water lines. I would like to use a 3/4 to 1/2 inch reducer at the ...
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1answer
229 views

Why is the pilot on my GE water heater turning off when the burner turns off?

I have 2 GE 28 gallon water heaters, both of which have the same problem. The water heater is turning off after a while, and I have to light the pilot again to got hot water. What could be causing the ...
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1answer
355 views

Why does my Rinnai Infinity water heater fire up after turning off the cold tap?

I have a Rinnai Infinity XR20. It's about 3 years old. I've just recently noticed a peculiar issue with it that I hadn't noticed before. If I turn on a cold tap like the one to the garden hose and ...
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1answer
41 views

possible cause for the water heater being unable to be lighted

The water heater could not be lighted. I tried several times without being successful. What could be the possible causes for the water heater to fail to be lighted. This water heater is only 1 and ...
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2answers
431 views

How to calculate potential energy savings from using a tempering tank?

I have a boiler (oil) with integrated water heater (3.5 gallon). I don't have problems with running out of hot water but I do wonder if having a tempering tank before the boiler would save money on ...
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1answer
469 views

How can I prevent a tankless propane on-demand water heater from freezing up in very cold climates?

We are considering installing a tankless propane on-demand water heater in a residential setting, where multiple tenants use a shared bathing facility (presently served satisfactorily by a 40 gal ...
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0answers
130 views

Can a water heater be installed overhead?

Sorry for the long preamble: I'm doing a remodel which involves building a new attached garage. At the same time, I'm replacing the water heater because it is ancient. I have considered a ...
5
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3answers
13k 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 ...
0
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1answer
581 views

Is this electric water heater wiring correct?

I recently re-wired my water heater from 120v to 240v. I'm not sure why it was wired with 120v to begin with, but it was not providing enough volume of hot water. I looked up basic thermostat wiring ...
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1answer
5k views

Why is my electric hot water heater producing lukewarm/cold water?

Yesterday after returning home from work I discovered my hot water is not working. When you turn on the faucet (any in the house) just a little warm water comes out and then it turns cold. I checked ...
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2answers
6k views

What could cause a shower to give warm water for a few seconds, then only cold water?

The house has four bedrooms. The 40 gallon gas water heater is about 60 feet from this shower. The house is a one story house in flat terrain. I have already changed the mixing faucet for the shower, ...
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3answers
348 views

Is it safe to install this hot water tank from ebay?

Is it safe for me to replace my electric hot water tank with this continuous electric unit that I bought on ebay? (I'm in Australia) Technical Specifications rated power 6.0KW ...
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1answer
101 views

Why is my electric water heater not working?

I have electric heating in my flat. My water is not heating up even though the timer light comes on and the immersion light comes on. Any idea what it could be?
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1answer
118 views

How do I turn off my water heater drain?

I read that draining the water heater is general good practice. The problem is that I don't know how to turn off the draining plug. It kept draining water through the night. Here is a picture of the ...
0
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1answer
41 views

Inline water heater temperature floor?

I have an inline water heater. Once it gets hot it will stay that way for 20+ minutes at a time easily. When the shower gets used it feels like their is a floor in how cold the water will get - if ...
5
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3answers
4k views

Is it OK to drill through a jack stud/full stud pair to cut a hole for water heater drain pipe?

I just had a new water heater installed in my garage. My city building / plumbing codes require that the water heater overflow drain be drained to the outside of the house. Situation: The heater ...
7
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2answers
6k views

What can I do about high water pressure that is causing a leak?

One of our showers has an intermittent leak, and I've figured out that it happens when the hot water heater is on. There's no expansion tank on the cold supply side for our hot water tank, so I'm ...
5
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1answer
149 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 ...
2
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3answers
5k 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, ...
2
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1answer
225 views

Plumber told me it's unsafe to drain my water heater — what should I do?

We are new homeowners. Our 11-year-old 2nd-floor water heater was leaking and the first plumber who came told us he would need to come back with a partner to take it away. I asked if I could drain ...
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0answers
279 views

Can I reuse an abandoned roof vent?

I have a house that has an old 8-10 inch diameter vent that used to be used as stove/oven vent. I think that newer gas ovens don't require venting like a water heater needs (ie they don't have a ...
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4answers
1k views

Which water heater types do you recommend?

I would like to upgrade my current water heater with one that Is able to produce/store more heated water so I won't run out Energy efficient Inexpensive What are the advantages/disadvantages to ...
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1answer
1k views

How do I diagnose and fix an electric water heater leak?

I have an Electric Water Heater, seemingly leaking from the top of the tank. The "wells" on top are filling up with water. There are no noticeable leaks from the pipes above. Each water attachment ...
3
votes
1answer
1k 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 ...
2
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1answer
705 views

Why does my Paloma tankless water heater turn off randomly without errors?

We have a Paloma Tankless water heater, model: PTG-74PVN that shuts down when in use for a few minutes. There is no code displayed on the screen, it just powers down. This started happening a few ...
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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 ...
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1answer
176 views

What are the three copper connections to my water heater?

Why do I have 3 copper pipes in my gas water heater? It seems two are cold and one is hot. All videos I see online show only two pipes; one for cold coming in, one for hot going out.
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1answer
2k views

How can I remove a temperature and pressure relief valve that seems to be stuck?

I have a hot water heater relief valve that is leaking heavily. The water heater manual states I should replace the valve (which is OK by me). Unfortunately, I am not able to remove the valve as it ...