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Questions tagged [hot-water]

Questions about systems that produce and distribute heated water.

8
votes
1answer
9k views

How do I fix a shower mixer so I get hot water without turning the knob all the way?

I have a single knob shower, Valley brand. Almost the entire range of the turn from off to completely hot, it is just cold water. Only in the last half inch of the turn does any hot water start mixing ...
7
votes
1answer
1k views

Why does my water heater's drain line rejoin the outlet pipe?

I know very little about water heaters and plumbing. Done some minimal work, but never water heater hookup. I need to replace my 20 year old AO Smith 50 gal gas water heater in a house I've owned ...
6
votes
1answer
449 views

Very low hot water pressure entire house

Setup: Electric 53 Gallon Heater, installed in 2014 by previous owners. Location: Tampa bay, Florida, Home built in 1961, typical cinder block house. WE purchase the home in December and all has ...
5
votes
3answers
2k views

What type of hose should be used when flushing a water heater?

I know that a hot water heater should be flushed yearly to mitigate sediment buildup. What kind of hose should be used? Is a simple garden hose sufficient, or will the hot water melt or damage the ...
5
votes
6answers
13k views

Code for elevating water heater in garages?

A gas/propane water heater in a garage is elevated. This is to ensure the open flame (at the bottom) is above a certain height (?) to avoid any combustible fuels in the garage from igniting. This all ...
5
votes
4answers
3k views

Fast hot water - tankless heater as backup or recirculator

My master bathroom is the farthest from my electric water heater (traditional with a tank) on the other side of the house. All other faucets are much closer and receive quick hot water. During the ...
5
votes
4answers
2k views

Hot water temp in shower/tub fluctuates

I live in a condo that has 13 units in two buildings and am the president of the board. A few months ago we had a new water pump installed in our boiler room. Shortly after that all three units in my ...
5
votes
1answer
665 views

Why does shutting off cold water valve to the water heater shut down cold water in entire house?

I'm a new homeowner so maybe my understanding is off. My question is, why would turning off the cold water intake valve on the top of the heater turn off cold water to the entire house after about 12 ...
5
votes
5answers
2k views

Why does hot water only run for 30 seconds in bathtub?

In the bathroom of this rental is a tub with a shower diverter. It's an older setup with a hot & cold faucet and a center valve (one direction diverts to shower, the other to the tub faucet). If ...
5
votes
2answers
1k views

Voltage increase when connecting a large load to household circuit

So in the place I'm currently staying, they use an inline hot water heater1. This is a ~5500W, 50A beast2 that replaces the shower head and heats up the water as it comes out. Notably, even 5500W isn'...
4
votes
3answers
848 views

Should I be calling a plumber or someone from my water supply company to test for contaminents in my water?

I have one bathroom where the hot shower water has a sulfur-like odor to it on most days and I'd like to have someone come and check it out but I'm not positive on who to call.
4
votes
1answer
635 views

What is this plumbing “temperature regulator” called, and how do I adjust it?

I was told the below restricts/governs how much hot water can make it to my tub/shower. I'd like to know what it's called, and how I can adjust it to get hotter water. I'm attempting to twist the "...
4
votes
1answer
13k views

How long should the hot water last during a shower?

Given a 40 gallon natural gas water heater, and a shower head with a flow rate of 2.5 gallons per minute. How long should the shower be able to maintain 105°F water temperature? Assume the average ...
4
votes
1answer
423 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 ...
4
votes
2answers
338 views

Replacing 47-gal electric water heater with no pan and elevated drain

I recently moved into a condo unit in Washington, DC (2nd floor of 2 story building) and I'm looking to replace the 47-gal lowboy electric water heater that's from 2003. The problem is that there is ...
4
votes
1answer
207 views

Flushing a water heater

I replaced my water heater 2 years ago, this weekend I plan on flushing it. I have read steps anywhere from turn off the gas and stop the water line, to just open the spigot at the bottom and fill up ...
4
votes
1answer
355 views

How can I run plumbing from house to a nearby new office 1.5m away?

I am building a new office next to the house; it is about 1.5m away. I need to run, from the house's upstairs bathroom, 1 hot, 1 cold, and radiator with return (all of which I believe are 28mm to ...
4
votes
0answers
123 views

Strange Pin Pierced Pipe in Boiler

Just wondering if anyone had any ideas on this? The other day, I put the central heating on for the first time in about 6 months. The radiators did not get hot and within a few minutes the boiler ...
3
votes
8answers
7k views

How do I get an exterior vent to stop frosting over in a cold Canadian winter?

We have a high-efficiency gas-fired hot water heater (in our a basement) that is vented to the outside of our house. When the weather gets below -30°C the vent has a tendency to frost-over. When ...
3
votes
1answer
984 views

Dropped Item in hot water heater

When I was redoing the plumbing to my hot water heater I accidentally dropped a pen cap down the vent stack/flu. Will this cause any problems? Like melting or catching on fire? Its going to take a ...
3
votes
2answers
3k views

How can i increase the temperature of my student housing shower?

I'm living in a completely new building that was just finished this summer, and have consistently been experiencing water temperature problems. For some reason, the water temperature has never been ...
3
votes
4answers
3k views

Is a tank-style water heater always under pressure?

Is a tank-style hot water heater always under pressure? In other words, is the entire tank pressurized? Is the pressure largely created by the force of the incoming cold water supply?
3
votes
3answers
7k views

Do hot water tanks have to be in the drain pan

I bought a new hot water tank and had it installed by a plumber. It didn't fit in the existing drain pan, so he put it on top of the pan. Is this safe?
3
votes
1answer
1k views

Why does my shower keep alternating between freezing and boiling by itself?

A little while ago our totally fine bath/shower tap unit broke in our bath. Our landlord's plumber installed a new one and since then we've had big problems. Steps to reproduce: We get in the shower, ...
3
votes
1answer
168 views

satellite water heater or recirculating pump?

I want to eliminate the long wait for hot water in my kitchen. I've ruled out a tankless unit there, so it's between a small storage-tank unit (6-12 gallons), or a recirculating pump (between the main ...
3
votes
1answer
89 views

Summertime hot water in the cold lines

I have an oil fired boiler (baseboard) that also heats my hot water. The hot water has a line from the cold supply to feed the system then it circulates through the boiler and into a tank for storage....
3
votes
1answer
1k views

How could a hot-cold plumbing crossover spontaneously appear?

OK, this is a weird one. Follow the bouncing ball: I have a tankless water heater I've had problems the last few weeks with the water running lukewarm instead of hot. Someone suggested power-cycling ...
3
votes
1answer
1k views

Why is the hot water in my tub fluctuating between hot, warm and cold?

I've been living for a year in a 1985 (or so) 8-floor condo in the NYC metropolitan area. The building is well managed. I have a kitchen and a bathroom with both a separate shower and a jacuzzi/...
3
votes
2answers
1k views

Showers in house run cold after 30/45 seconds - Sinks scalding hot?

Have a two story house with kitchen, main bath, guest toilet and laundry room on first floor, and two bedrooms upstairs with one full bath each. The water heater is a 55 gal gas operated, located in ...
3
votes
2answers
932 views

Water Supply Noise due to Thermal Expansion?

I have a plumbing issue that I'm looking for suggestions on. After using a substantial amount of hot water (say, a long shower + washing laundry) I will hear a loud rumbling / vibrating sound ...
2
votes
3answers
24k views

Should I replace all the copper pipe in my heating system with PEX?

I am replacing my existing faucet plumbing with red / blue PEX all over the house. Everything that goes to the sink, dishwasher, washer, bathroom sink and so on will be color coded and installed ...
2
votes
2answers
95 views

Will increasing the temperature of my hot water cylinder's thermostat make my shower water supply last noticeably longer?

I have an unvented electric immersion heater cylinder which heats the hot water for my household. The capacity is 200L and the temperature is set to 55°C. The water heater is hard-wired to run ...
2
votes
1answer
902 views

Is wrapping Roxul around hot water tank pipe a fire hazard?

I have heard Roxul is safe and non-combustible, I need to wrap something around the vertical hot water tank piping leading up to the attic. This pipe can be seen in the basement ceiling and there is ...
2
votes
3answers
1k views

No hot water (at all) on upper floors

A few days ago, the bathrooms on the 2nd and 3rd floor of my townhouse stopped getting any hot water. Nothing comes out of the faucets when they are turned all the way to the hot side. The cold water ...
2
votes
3answers
3k views

Would upgrading hot water radiator heating result in much better efficiency?

My wife and I are thinking about buying a funky old house where we live, in southern Ontario, and trying to prioritize upgrades. There's a lot of knob and tube to replace -- top priority -- and some ...
2
votes
1answer
30 views

How to prevent galvanic corrosion on water tank inlet

My current hot water tank, presumably installed by a DIY former homeowner, has severe corrosion on the inlet tube and must be replaced due to a considerable leak. Were I to DIY, how could I prevent ...
2
votes
2answers
49 views

Can I reduce hot water distribution delay with thinner tubes?

Kitchen and bathroom(s) are at the opposite sides of my house (14m). I recently replaced and moved my hot-water-heater (electric, now thermo-dynamic) closer to the bathroom(s) in order to reduce the ...
2
votes
2answers
107 views

Cold water leaking into the hot lines?

Recently the water heater (installed upstairs) had a leak so I disconnected it and removed it. There is a ball valve shut off on the cold line into the tank - I closed it to be able to open the main ...
2
votes
1answer
7k views

Why did a failing water heater emit an electrical burning odor?

Our electric water heater seems to have burned out, but the breaker didn't flip off. My husband smelled an acrid burning smell in the house and traced it to the water heater, which is in the bathroom. ...
2
votes
3answers
241 views

Water heater too hot, possibly caused by low water flow

I have a puzzle: The water heater in a small building was too hot -- scalding. Turning the thermostat down to warm or even vacation didn't seem to make a measurable difference. We were about to ...
2
votes
1answer
75 views

Odd smell from hot water if I don't use it for a while, what could it be?

I moved in about 3 years ago. I noticed when I was running hot water I got a terrible fart smell from the water. I ran all faucets on hot in the house to drain the hot water heater and fill it with ...
2
votes
2answers
310 views

Are the resin beads inside old water softeners flammable?

Our old water softener just broke and released all the resin beads into our hot water heater. I've been draining it but a significant amount of beads went into the drain pan under the hot water heater....
2
votes
1answer
327 views

Water radiator system has single loop instead of flow & return pipes — does this make sense?

I have a hot water heating system connected to several radiators throughout the house. While all diagrams I have seen of radiator plumbing have a separate flow and return pipe, this one has a single ...
2
votes
2answers
271 views

Is it safe to connect dish washers and laundry machines to hot water?

Is it a good practice to connect the dish washer and laundry machine to the hot water line, instead of the cold water line? My house has heated water, so this would save energy and time; I wonder if ...
2
votes
2answers
251 views

Any tricks to draining a tank-style water heater?

Are there any tricks to drain a tank-style water heater? Or is it as simple as attaching a hose to the small drain pipe and then opening the valve? Some web references have said you need to open up ...
2
votes
3answers
11k views

Why does my utility sink faucet vibrate and pound loudly?

I have a water faucet in my utility room that is about 10 feet from the water heater. It is the only faucet in my house that makes any noise, but when I turn the hot water on even a little bit it will ...
2
votes
1answer
12k views

Why isn't the hot water in my shower hot enough?

I have two showers in my house, one seems to be noticeably cooler no matter what I try. Both are Symmons Temptrol model A. The house is mostly PEX except where copper is required. I cannot take ...
2
votes
2answers
1k 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 ...
2
votes
1answer
23k views

How should I connect nipples to a hot water heater?

I recently installed my new hot water heater. I know nothing about plumbing and my installation procedure was informed only by sketchy home depot employees and youtube. One of the issues I'm having ...
2
votes
2answers
6k views

Can I remove the fresh air supply that is attached next to my furnace?

It looks like my gas furnace is already vented but I'm not sure. There are two white pipes from the top of the furnace that are vented outside. The furnace is a Trane XR90. We have cold winter climate ...