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Questions tagged [hot-water]

Questions about systems that produce and distribute heated water.

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3answers
83 views

Dedicated Hot Water Recirculating System Woes

Two plumbers and no remedies to why my hot water turns cold (but not as cold as the cold water rather slightly warmer). This problem began to happen gradually and it occurs at every hot water faucet/...
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1answer
19 views

Keston C36 Combi boiler - Error E37

According to the boiler manual E37 Water pressure error - You must top up the water pressure for your system When opening the fill loop valve to add water pressure, water flows out the exhaust ...
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1answer
16 views

After replacing a recirculating pump (and pressure regulator), shower won't run hot

We've just had a our pressure regulator replaced, and a new recirculating pump installed. All 3 showers used to get hot water reasonably quickly (15-20 seconds). Now the shower furthest from the ...
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3answers
111 views

How do I get 150F water to the dishwasher?

I have read in a maintenance manual that the ideal temperature for incoming water to a dishwasher is 150F. In my house, the hot water heater is currently set to 135F and it cools on traveling around ...
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0answers
32 views

Corrosion due to dissimilar metals or bad ground?

I'm a 1st time home owner but experienced DIYer here. Unfortunately I have little plumbing experience. I installed a hot water recirc. pump at my hot water heater about a month ago. I did not notice ...
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1answer
34 views

Can lost water pressure cause a water heater to leak/rupture?

I woke up this morning at 5 am to my water heater making loud noises. It had leaked all over the floor and the bathroom sink had a steady stream of hot water that wouldn't turn off. This water heater ...
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1answer
33 views

How to measure electricity used by hot water heater

I am debating the effort to save on electricity costs with my electric water heater. Solar water panel heater, hybrid water heater, etc. Before I go down that path, I want to track the cost of the ...
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0answers
31 views

What size anode do I need for this tank

I have an old pressurized hot water cylinder and I am trying to change the sacrificial anode however the local plumbing stores seem to only have anodes for models they currently sell and also I'm ...
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2answers
48 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 ...
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2answers
81 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 ...
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2answers
36 views

Why does the t&p valve on gas water heater open when the tank is filled?

Put a new t&p valve on my water heater and as soon as it fills up the valve opens why would this happen?
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33 views

How can I diagnose galvanic corrosion on a water pipe?

I have a newly installed indirect hot water heater and two of the pipes are showing significant amounts of corrosion. Given that the installation is only 3 months old, I suspect that there may be ...
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0answers
90 views

Why do I have low hot water pressure in showers only?

I have 2 showers in my house. Suddenly the hot water pressure dropped in both. The cold is fine and we haven't noticed any change in the faucets in the house. What could make my hot water pressure ...
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2answers
35 views

How does hot water get circulated into an indirect fired hot water heater?

For an indirect heated hot water tank, the hot water comes from a boiler. Why are there two output ports on my tank? I have appended below a diagram of an HTP/Superstor tank to use as a reference: ...
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3answers
45 views

Which is cheaper? Tankless or Storage water heater?

We are planning to build a family house, 2 adult, 2 child, 100m2, eastern EU. We got stuck that what kind of water heating should we use. Where we use hot water?: shower kitchen sink in bathroom ...
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0answers
24 views

Do I need the “flow control” component on my furnace

Context: My furnace supplies tank-less domestic hot water to my small house. The cold water pipe going into the furnace has a "flow control" component that limits the flow to 3gpm. I understand that ...
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2answers
40 views

No electric current going into Water Heater

We bought a brand new water heater back in November. Came home last night to no hot water. Check circuit breaker and it wasn't tripped. Turned it off an on anyway. Nothing. Hit reset button on ...
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1answer
44 views

Shower hot water not getting hot enough

I left my house unattended for a number of months. Before leaving, I turned off the water to the house and drained the lines. This was during the winter. Anyway, now that I am home, I notice my ...
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3answers
83 views

How does water flow through my water heater and up to the top floor without a pump?

My house has a gas based water heater(geyser) on the outside. The plumber has connected it such that without the use of electric pump, just through pressure alone, hot water reaches the 1st and 2nd ...
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1answer
453 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 ...
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1answer
32 views

Why don't I have hot water after shutting off the water supply for a while?

I have a 240 watt State Select 40 gallon water heater. I shut off the water supply for maybe 6 hours to replace faucet seats in the shower. I turned off wrong breaker, and 2 days later no hot water ...
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1answer
60 views

How to switch off/on a Hot Water System

I believe I have what is called a gas-boosted, solar HWS (although there is only one solar panel on the roof). On the outside of my system, apart for the valves/pipes/wires leading into and out of it, ...
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0answers
27 views

Lukewarm water in bathroom

I recently moved to a new flat. The hotwater is supplied by a electric heater located in the kitchen which is directly next to bathroom. In the bathroom, the tap for the shower doesn’t get hot to run ...
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1answer
32 views

Iron in Hot Water Heater

My water has a lot of iron in it so I have a water softener to take care of that. The problem is I forgot to check it and it ran out of salt. The majority of my house is fine (I have to better clean ...
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0answers
20 views

Hot water heater intake is very close to an outside faucet: how terrible is this?

My new house has an outdoor spigot which is supplied by the same copper pipe as my hot water heater. (There's no cut-off valve for the outdoor faucet individually!) Going backwards, the pipe from the ...
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0answers
20 views

Hot water comes through cold after turning off and on

I have a combi boiler providing hot water in my house. If I run the hot water (e.g. in my shower or kitchen sink) it comes through hot just fine after a couple of seconds and stays hot however long ...
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2answers
119 views

Hot water recirculation pump suggestion in home with return hot water line [closed]

We had a hot water re-circulation pump by water heater before and had it removed last December when we detected leaks around it. This is our setup: We have a return hot water line coming back to the ...
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0answers
52 views

Cold water handle overpowers hot water

In trying to fix a leak in my shower head, I ended up replacing both the hot and cold stems for Price Pfister handles. First, I replaced the hot water stem, which seemed to reduce the leaking. But, ...
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1answer
80 views

Why would the cold feed be backfeeding hot on a hot water heater?

The cold line is "upfeeding" hot. Both of the pipes running out of the hot water heaters(dual system) are hot. When we run the hot, it gets cold again. The cold feed pipe is hot until it reaches the T ...
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0answers
123 views

electric hot water heater high limit switch repeatedly opening

The problem I am in the southeast US and have an electric hot water heater that is 25 years old (as is the house). Two years ago, I diagnosed and successfully replaced the lower thermostat. Earlier ...
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4answers
172 views

New electric hot water heater, hot water turns luke warm after 12-15minutes of use?

Converted my oil burner to a gas burner and added an electric hot water heater. When i use the shower the hot water turns to luke warm in 12-15 minutes. It was installed by a professional plumber and ...
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1answer
25 views

water heater - flow problem

got a new 3 liter instant water heater installed. When the heater is off, water flow is normal. When it is on, about one liter or so hot water flows and then there is no water. What might be the ...
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1answer
17 views

How to remove thermocouple from this manifold door?

It has a black object that seems to be secured down by a U shaped clasp. I cannot see how the clasp can be removed. Everything is tight and doesn't appear that a tool can fit anywhere to loosen it up. ...
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3answers
75 views

Small electric water heater below sink to get instant hot water?

There is quite long pipe going from the gas water heater to our kitchen sink. This means that there is a delay before hot water actually becomes hot, especially in winter months. Now I saw that there ...
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2answers
94 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 ...
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1answer
105 views

Hot water tank cold water is always flowing

My hot water tank cold water is always flowing and it's losing water out of the temperature valve relief tube on the cold water intake side (see attached photos). I just noticed this, but it could ...
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3answers
194 views

How do I bleed a noisy radiant heat system?

I have a gas fueled (converted from oil just a few years ago) boiler in my basement with an integrated tank-less water heating system for the showers/taps/etc. The output is three zones as shown in ...
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1answer
89 views

Should I turn the water off to my home during a winter absence?

I will be leaving my home for three months, during winter, where I can expect the weather to go below freezing. My question is if I should turn off the main water valve in my house or just to the ...
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1answer
85 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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1answer
1k views

Hot water is not getting hot in kitchen sink only

The hot water valve is open and the water comes out but it stays cold. We shut off the cold water valve and it made no difference (besides obviously when you turn to cold side no water pours). We ...
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1answer
46 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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1answer
40 views

Temperature monitoring for storage hot water system (RP-2 connection)

My HWS has a secondary outlet connection I don't use, and I'd like to use it to install a thermal probe I can monitor. HWS RP ¾ / 20 temp probe? Does anyone know of a practical way to install a ...
4
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1answer
391 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
2k views

How to shut off water coming from the hot water heater

I'm trying to shut off water coming from my hot water heater. I currently have the water shut off to the entire house due to a shower repair that went awry (hot water flows like a shower even though ...
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0answers
413 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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2answers
449 views

should i wrap exhaust duct joints of hot water heater?

i replaced my hot water heater. I used a single flexible 3" metal duct tube to go from the new unit to a an old "y" connector metal duct that is near the ceiling in the utity closet. I noticed ...
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1answer
60 views

Activating hot water recirculation pump in garage via extension cord under kitchen sink

I have a hot water recirculation pump installed near the water heater that is located in the garage which provides instant hot water via dedicated 1/2" copper pipes. Although I have a timer that ...
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1answer
47 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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0answers
39 views

Isolating water supply to replace basin tap with no local stop valve

I got a new tap for a pedestal basin. Looking at the existing fittings there is no local valve to shut off the water at the basin itself where the water pipes come out of the wall & connect to the ...
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1answer
207 views

How can I drain the hot water line in my house? (re: adding a spigot)

I'd like to add a hot water spigot to the outside of my house but my hot water heater doesn't have a shutoff for the output (ie. hot water side of plumbing). However, the cold water has a shutoff (...