Questions tagged [hot-water]

Questions about systems that produce and distribute heated water.

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Will repeatedly opening and closing the water heater intake valve cause any issues to water heater? [closed]

Will repeatedly opening and closing the water heater cold water intake valve to prank someone in the shower, cause any issues to water heater? I noticed a noise when I closed valve when someone in 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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Does a hot water dispenser heat water by itself?

Does such a hot water dispenser heat water by itself? https://www.grainger.com/product/IN-SINK-ERATOR-0-7-gal-Hot-Water-Dispenser-23NU44. I saw one that looks like the one in the link was installed ...
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How does the sensor in a hot water circulation system inform the pump to turn off?

I’ve been reading about hot water circulation pumps. The articles will typically have a sentence like “The sensor valve lets the hot water circulating valve know when to shut down and turn on the pump....
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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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1 vote
2 answers
78 views

Device to run cold water out of pipes?

Is there a device that will run cold water out of pipes? Rather than have my dishwasher fill with cold water and then heat it up by the coil, I want to run hot water into the dishwasher, but the ...
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Water Heater Connection Rust and Corrosion

Can the rusted connection simply be replaced? Or does the rust mean I need to get a new hot water heater?
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2 answers
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Reduce part count for countertop dishwasher hookup?

I bought a countertop dishwasher. Home Depot did not have adapters to connect my faucet to the included quick-connect adapter. I have also heard that the hoses in pull-out faucets are not meant to ...
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1 vote
1 answer
42 views

removing cold and hot water lines from hot water tank

I need to replace my hot water tank as it's old and we run out of hot water fast. I actually did maintenance on it by shutting power off, cut off cold water and draining a bit of water from bottom ...
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3 votes
2 answers
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Planning a Domestic Hot Water Recirculation Loop

My coper piping has lots of pinhole leaks and I am planning to replace everything with CPVC. I have a one-story ranch house with an unfinished basement, so I can access almost everything very easily. ...
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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
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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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2 answers
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Navien: water cold in winter and hot in the summer

I have a combi Navien tankless hot water heater. It heats my home as well as the water. I keep getting lukewarm water in the shower even after the lever is turned completely to hot. The Navien service ...
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2 votes
0 answers
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How to adjust a thermostatic shower cartridge?

I changed the thermostatic cartridge in my shower and I am struggling to calibrate it so that the temperature is comfortable, and the temperature control is logical. It looks like this, which is a ...
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2 answers
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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 answer
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Hot Water won't turn off, Cold water won't turn on in bathroom

I don't know much about anything actually relevant here but for whatever reason the water specifically in our bathroom is basically broken. We live in a trailer so we leave the hot water dripping in ...
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1 answer
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Consolidating cpvc elbows out of water heater

I've just noticed a crack in one of the 90 elbows coming out of our water heater, which I am going to replace. But for some reason, the water makes 3 turns before going to the rest of the house. I ...
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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 answer
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Why are my heat radiators only partially heated?

We moved in to a house around 6 months ago. I noticed that our radiators were not getting too hot so went ahead and bled them. I managed to eventually get water out of most of them however a couple of ...
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Confused about how to heat water with water heater alone

I have a water heater, a boiler and an oil burner. I'm not sure if you're allowed to state names of products on stackexchange so I apologize in advance if by naming names I break the rules. The ...
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3 votes
1 answer
59 views

Can I wire a switch to toggle between the top and bottom outlets of a 1 gang receptacle

Pardon any misused vocabulary, I'm still kinda new to this stuff. I have a dedicated 15 amp circuit wired to a 1 gang, 2 outlet receptacle under my kitchen sink that powers the disposal. The entire ...
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Trouble with water and electric hot water heater

So our cold water has low pressure and we've had water problems for over a year now, not sure if that matters. But I was doing the dishes and the hot water started to get cold but i figured someone ...
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2 votes
2 answers
102 views

What steps should be taken when starting to use a hot water system that hasn't been used for years?

Our house has a gas boiler that's connected to both a closed-loop central heating system, and to a system involving a hot water tank and a cistern (through a valve that determines whether it ...
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4 votes
4 answers
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Hot water tank loses heat by closed loop gravitational circulation - need to improve thermosiphon

I have a 300L hot water tank. It's heated from an air-to-water heat pump. The hot water tank is connected to a heat exchanger. When any hot water faucet is opened, a circulation pump is turned on ...
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5 answers
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POS Tankless with Electric Tank water Heater in series?

I have a 3000 sq ft house on 3 levels. We have 3 full bathrooms and run out of hot water. No Gas available, everything is electric and I live in VA. Can I run a small, 3GPM, Tankless in series with ...
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2 votes
2 answers
158 views

Why does the water from my shower get hotter when I use a shut-off valve?

The water temperature in my shower is hard to control, so I bought a shower shut-off valve hoping to be able to conserve water by setting the temperature at the beginning of my shower and to ...
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1 vote
1 answer
735 views

How do you bleed the air out of a Grundfos UPS15-58FC Circulating Pump?

My Grundfos UPS15-58FC has become a bit noisy when operational. Its a part of my heating system and it starts to hum from time to time and this causes the pipe its on to vibrate. I would like to try ...
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Honeywell ST9400C - Hot Water settings

I recently moved to a flat with the control panel mentioned in the title. Here's a manual I found online: manual for Honeywell ST9400C During my 14 first days in the flat, the electric bills sky ...
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3 votes
3 answers
314 views

Recommended hot-water pipe diameter to minimize time to hot-water at the tap

For a new build, I'll be running pipe from the hot-water tank to the two bathrooms, which are about 40' away on the other side of the house. One aim is to avoid the situation where it's necessary to ...
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1 answer
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It takes a long time before I get hot water upstairs. could this be due to hard water?

I live in a three-story townhouse and I have a Navien tankless water heater installed in my first floor garage. When I turn on hot water on the first floor, I’m able to get hot water pretty quickly, ...
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1 vote
1 answer
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what is the name/designation for two-conductor insulated shielded copper wire for 24V that runs to the aquastat?

I would like to order some wire online but don't know what it's called. Two-conductor shielded copper wire for 24V, insulated so it could be secured with zip-ties to the HX supply and return pipes ...
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1 vote
0 answers
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What is causing my tap (faucet) to not work properly?

Background My flat is on the 3rd floor of a converted Victorian building and the mains water pipe to my flat has a booster pump installed on the ground floor to improve water pressure. Whenever any ...
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What is the name for the adapter to take indirect hot water heater drain valve male thread to garden hose

The male threads on our indirect hot water heater tank's drain valve are 30mm actual outer diameter. What is that drain thread's nominal designation? I need to get an adapter for it to attach a ...
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Why is there no flow-check valve in this diagram of indirect hot water heater

In the attached installation diagrams for an indirect hot water heater there is no flow-check-valve on the return in the top diagram with zone valves but there is such a check valve on the bottom ...
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1 answer
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Valves on an electric hot water heater

I'm getting ready to replace my GE electric hot water heater. On top there are hot AND cold water valves. When draining the heater, I know to shut the cold water valve. What about the hot water valve? ...
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Instant hot water heater failing

I have one of these: https://www.tlc-direct.co.uk/Technical/DataSheets/Redring/RRRP1E_Installation_Guide.pdf It started to trigger the thermal cut-out every now and then. I opened up the device, ...
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2 votes
0 answers
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Hot water pipe falling off

Any suggestions on how to fix this hot water tank pipe (tightly setup) falling off - am planning to call in a plumber
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1 vote
1 answer
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Turning off hot water at tank: input or output or both?

I have a tap dripping hot water and need to turn off the supply of hot water. The house has a gas water heater in the basement. There is a valve on the water supply leading into the tank and another ...
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Loud groaning when turning on hot water

I recently installed a new faucet in one of my bathrooms, but now I'm having trouble with the hot water part of the faucet. If I turn it on too quickly, the faucet makes a loud groaning noise and no ...
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-1 votes
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My hot water won't turn on unless the central heating is on as well, why?

I've looked at a few related questions, and I can't see a similar question being posed. Our hot water taps only work (i.e. produce hot water) if the central heating has been on, which we tend not to ...
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0 votes
2 answers
67 views

Gas Tankless hot water heater shuts off when mixing

I have a tankless gas hot water heater that powers a shower. There is minimal distance between the heater and the shower. When taking showers and trying to mix the hot and cold water to get a ...
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Does a diverter valve based on temperature exist?

I want to install a solar water heater in my house in the future, so I've been thinking about how I could do it, something like this: Cold water enters the solar heater, hot water comes out. If it's ...
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0 votes
1 answer
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What is the purpose of pipe connecting in and out hot pipes to water cylinder

What is the purpose of the circled pipe, which connects the pipes that go to and from the boiler to the hot water cylinder in my vented domestic system? The diagrams I have seen of other systems do ...
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114 views

what is this electrical component in my thermocouple?

I have a 14 year old has water heater which i believe needs a new thermocouple. I can relight the pilot but it will not stay lit. I've bought a new thermocouple, and I'm prepared to replace the old ...
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1 answer
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One bathroom faucet, cold water only, unless I run multiple faucets?

I have a 5 year old home in NC. In the master bath, I have a his-hers dual sink with two handled Delta faucets. One faucet is broken and can only provide cold water from both sides. If I run hot ...
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0 votes
1 answer
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16 showers , 6 toilets, 8 sinks and 6 urinals what size of water pipe should be for the supply?

I have building with 16 showers , 6 toilets, 8 sinks and 6 urinals what size of water pipe should be for the supply?
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0 votes
1 answer
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Rinnai tankless on-demand water heater making a high-pitched whistling sound

I have a Rinnai tankless on-demand water heater. The unit is making a high-pitched whistling noise. I have: -Unplugged the unit from the electrical wall socket. -Turned the gas valve to the off ...
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2 answers
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Can I switch the hot and cold water supply to improve the pressure of hot?

I have a very old house (built in 1903) with very old and corroded pipes. Because of the corrosion, the hot water pressure is fairly low (mostly in the shower) but cold water pressure is okay. I’m ...
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1 answer
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Unable to turn knob on Rheem hot water heater to pilot

I have a Rheem heater (Model# PROG50-38N RH60). The pilot has gone out. This tutorial suggests I must turn the knob to pilot to start the process of relighting the heater. When I try to turn my knob ...
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