Questions tagged [hot-water]

Questions about systems that produce and distribute heated water.

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4k 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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3answers
2k views

Flow sensor adjustment for Navien 240S natural gas

We installed a Navien 240S natural gas in our house, and it is working fine. Except the short range for hot water valves in the showers. So, in other words, I need to turn shower valve almost all ...
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2answers
55 views

Why would turning on/off hot water when the toilet is flushing cause the tankless pressure relief valve to release water?

I noticed the other day that my tankless hot water tank was occasionally spraying water all over the place from the Pressure Relief Valve. The only way I've found that seems to reliably trigger this ...
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2answers
41 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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4answers
1k views

Boiler heating extra zones

Background: This is a new house, with a boiler system I'm not familiar with. Instead of zone valves, each zone has its own pump (4 zones). There is a fifth pump on the other side of the boiler. Not ...
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2answers
42 views

Installing Tankless Hot Water System - Amp Questions & Using AWG 6 Wire with Current Tank

I'm looking into researching about installing a Hot Water Tankless system. Specifically I want to install the following: Rheem Tankless Water Heater 2.14 GPM 13 kW Self-Modulating Electric Wall ...
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1answer
41 views

How can I figure out if a Combi Boiler will be adequate for my house?

We recently moved into our new home that currently has a Super Hot MG-100 Hydronic Boiler (installed in 1986, when the house was built). Clearly, it's done its job and in need of a replacement. We had ...
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2answers
1k views

What options exist for replacing or upgrading heater radiators?

I've got a hot water heating system in my home. Some rooms have baseboard radiators (recent ones), then other rooms have old radiator faces like this: The heat isn't coming up so well in some of ...
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1answer
163 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 ...
4
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1answer
148 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 ...
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2answers
474 views

Temperature of water in the shower fluctuates - will a cheap thermostatic tap help?

I recently moved to an apartment where temperature of water in the shower fluctuates and we called for a plumber. He either cleaned up or replaced one part (I think it was the mixer - nothing visually ...
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1answer
181 views

Where to place an aquastat that is external to the hot water tank?

If you need to retrofit an aquastat to a heating system what is the best way to do so? i.e., in some hot water tanks or even boilers there may be a purpose-made port specifically to accept a "well" ...
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1answer
97 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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0answers
24 views

Is my CH/HW fully pumped? Is it two-pipe?

I'm having problems understanding the exact configuration of the CH/HW piping in my house. In particular, I have to understand where and how to place piping for additional radiators at the upper floor....
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0answers
44 views

Tankless Hot Water Recirculation

I recently had a Rheem Tankless Water Heater installed. The rtgh-95dvln-2. They installed the pump kit meant for the water heater, the ap17920. However, I do not have a dedicated recirculation line, ...
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1answer
46 views

hot water, baseboard oil boiler - bleeding at boiler site possibility?

I may replace my current oil, baseboard boiler but would prefer bleeding the system at the boiler site (if it's possible) vs at every room separately. Is it possible to bleed air out at the boiler, ...
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0answers
37 views

Tankless hot water system only providing luke-warm water?

I have tankless hot water which has been working well up until this week. A week ago we discovered a leak on the hose from the propane tank, so we replaced the hose, but since then it hasn't seemed ...
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1answer
44 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 ...
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1answer
35 views

Hot water cylinder (direct heating), loosing heat and pressure during the day

I moved into a new property a few months ago with a direct heating hot water cylinder. This is a new one for me as I have always had a gas combi boiler before. I have economy 7, so the water heats ...
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1answer
47 views

Intermittent cold water from the hot faucet

Why would cold water run from the hot water faucet (for about a minute), after the hot water was already flowing? This happened in two washrooms, at different sides of the house, but not at any other ...
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2answers
981 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
43 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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3answers
1k 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 ...
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3answers
96 views

Can I run a gas hot water heater on propane?

I have property where I am boon-docking an airstream. I've been looking into a passive solar hot water heater design, For the holding tank I was looking at using an old hot water heater, I found a ...
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2answers
31 views

Thermostatic mixing valve that holds water temperature at 120°F / 50°C

I've recently installed solar hot water and as expected it gets extremely hot. I would like to keep the tank as hot as possible (>180°F) and simply mix down the water to 120°F / 50°C as it's used so ...
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1answer
59 views

Chlorinate hot water heater

I left town for a week and now have a hot water heater that's been sitting and apparently breeding bacteria resulting in an abundance of hydrogen sulfide. It stinks really bad. I tried emptying it ...
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1answer
45 views

A water heater pressure relief valve/pipe is guided to release hot water outside of the pan (see picture). Is this installation correct?

A plumber installed the hot water pressure relief pipe to point outside the water heater pan, as shown in this picture (on the right). What could be the reason to do so? Is this recommended/proper ...
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3answers
70 views

Can you use aluminum foil around gap at floor of hot water tank then seal?

Fairly big gap at floor around pipes of hot water tank. For mice prevention I read some where you could fill gap with aluminum foil then seal. Is this correct. If so what kind of sealant should be ...
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2answers
363 views

Shower in another room leaks when bath is running

I have a free-standing bath in my bedroom and a separate shower stall in an adjacent room. When we run hot water in the bath the shower head starts running-- not just a drip... more like moderate ...
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3answers
286 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
25 views

Hot Water Water Hammer When Cutting Off Cold Supply

The house is 3 years old. This just started to happen. When you cut off any cold water supply the inlet line to the water heater knocks or water hammers. The first attempt I cut the water off at the ...
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1answer
65 views

Water heater busted

Water heater busted this morning, after a couple of hours the water was turned off at the main in the yard. Now how can I cap off the hot water heater in order to still have water in the house, I can'...
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2answers
77 views

Flushed water heater yesterday got a lot of sputtering right after that and today hot water is not flowing with the same pressure as before

Yesterday I decided to flush my water heater and I did the following: turn to pilot turn off cold water supply to water heater open valve and drain hot water. I noticed it was still flushing for a ...
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1answer
47 views

cheap hot water tank failure after 3 1/2 years - expected, luck, installation problem, acid water, pressure cycle?

This "6 year" hot water heater failed after 3.5 years - is it bad luck (eg normal for the $429 box store 40 gal DHW heaters and how they make money off what I expect is a pro-rated warranty?), poor ...
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0answers
29 views

Using existing hot water vent for extraction

I have a room in the basement with equipment (computers) that gets really hot. There is an ac vent but the thermostat is nowhere near the room. Also in an alcove is the hot water heater behind a ...
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2answers
30 views

Why does a system boiler with hot water cylinder not use a diverter valve?

I understand that it doesn't need a diverter valve... But I was thinking, couldn't the system be more efficient with one? For example, the central heating could run at a low temperature (35°-40°) and ...
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1answer
46 views

No hot water after teeing to outside spigot

I recently saw an outside cold and hot water spigot on This Old House. After checking out prices, I decided I'd make my own redneck warm water spigot by bringing a hot water line close to the outlet ...
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0answers
21 views

How to hookup an InSinkErator hot water dispenser to a Waterstone Hot/Cold Faucet

I'm trying to figure out what to do with the 3rd connector on my InSinkErator H-CONTOUR-SS. I have a WaterStone hot/cold filtration faucet model 1400HC-SS that doesn't have a connection for that 3rd ...
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1answer
76 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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2answers
147 views

Is there an electric tankless water heater that takes multiple electric lines as input?

I currently have a 50 gallon water tank in my house and I want to replace it with a tankless system. The primary reason to replace it is space. I recently installed 2 HeatWorks Model 1 units to test ...
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3answers
151 views

Water heater working when flushing a toilet

I have a tankless water heater. After I finish to use hot water and I close the faucet, the water heater starts a fan and make a typical noise, it's very typical and expected. I guess it blows off ...
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1answer
40 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 ...
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2answers
92 views

Can I replace a 40A water heater breaker with a 60A breaker to prevent trips?

Double 40 amp breaker tripped as HD want work. Can I use a double 60 amp on my water heater?
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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 ...
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1answer
53 views

Gas hot water tank leaking - water turned off, what about gas? Repair or replace?

My water heating tank has sprung a leak - out of the top (fortunately?) Whoever installed this thing didn't do a proper job of preventing galvanic corrosion, so the tank input is corroded (irreparably,...
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1answer
84 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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3answers
141 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
63 views

Changing hot water supply and keeping cold water supply

Repiping my master bathroom shower and sink. We have a new instant hot water heater on an addition to our house 10' away. The shower and sink now run off the water heater in garage, 100' away. I tee'...
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3answers
130 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
39 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 ...