Questions tagged [boiler]

The boiler is used in a central heating system to heat water that is pumped through pipes to radiators within the home.

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266 views

Combi boiler on 2nd or higher floor - how to tell if water flow and pressure is sufficient?

The combination boiler in my house has to be moved, and one idea is to put it in the loft space to free up a decent amount of space in the main part of the house. The house isn't big, so this would be ...
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1answer
158 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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1answer
139 views

How do combi boilers with built-in hot water tanks work?

A number of combi boilers on the market in the UK have small (approx. 20 litres) internal hot-water tanks. These boilers are commonly marketed as being suitable for households with high hot-water ...
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1answer
42 views

The safety valve on boiler is really noisy

I have this safety valve installed on cold water inlet of my boiler/water heater. When I turn on hot water tap but keep it around 30%-50% open this valve produces really loud noise, which travels ...
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1answer
2k views

Purpose of hot water tank and boiler

What is the purpose of the hot water tank and boiler when it comes to a) heating and b) drinking water. When I switch on my boiler (not combi) for both heating and drinking water, I see a flame lit ...
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2answers
5k views

Apartment boiler system. Very hot water coming out of cold water tap

My family and I live in an apartment. There is very hot water coming out of the cold water taps, and the toilet. I know it's summer so I expect some. In order to get even mildly cool water we have to ...
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1answer
4k views

Why won't my Central Heating Boiler turn off with Nest thermostat installed?

I bought a second hand Nest Thermostat v1 (the European model with heatlink). I installed it and the Thermostat seems to work. The central heating boiler (Vaillant hrPRO CW3 VHR NL CW 3/3) seems to ...
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0answers
1k views

Boiler issue diagnostic steps for a layperson (E37/E99)

I'm having some boiler woes which seem to have stumped my landlord's plumber, and I'm wondering if there's any clues people more experienced with this setup may recognise, or any recommended ...
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2answers
952 views

Replacing steel expansion tank with diaphragm expansion tank. Is location critical?

This morning I noticed a very old, closed, steel expansion tank in the boiler loop is leaking. Looks like the leak is coming from the side of the tank and not from the plumbing. Not sure if that can ...
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5answers
7k 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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2answers
480 views

Boiler vent and expansion tank leaks

I had my boiler inspected and cleaned recently and the tech found a few issues. He showed me how the valve on the expansion tank would leak when he would push it in, which means the tank needs to be ...
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1answer
1k views

What is/are this/these fittings connecting my boiler to circulator pump?

There's a leak somewhere around my circulator pump and the fittings that connect it to the Weil McLain CG-5 gas boiler have corroded and should probably be replaced. (right?) Not very familiar with ...
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1answer
112 views

Programmable timer for boiler without touching thermostat

I'll try to be clear in a field of which I know little... I have a new pellet boiler feeding hot water into a puffer for radiators and hot tap water. A thermostat in the house requests water at given ...
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1answer
373 views

I lowered the pressure on my boiler and it flooded

We have single-pipe steam in our four unit building. We installed Danfoss RA 2000 valves in 3 of the 4 apartments but they seemed not to work too well and also tended to spit water from the air valves....
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5answers
2k views

Use small UPS to power steam boiler

I have a steam boiler (natural gas fired) and I'm wondering if I can safely use a small UPS to backfeed power to the boiler, in case of a power outage. I'm not sure how much total run time I'd get - ...
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1answer
123 views

How can I have the water running to increase pressure on my boiler?

I have just perform a radiator bleeding following youtube video but the pressure dropped to zero in my boiling system vaillant ecotec pro, have a permanent red light in addition to the normal green, ...
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1answer
664 views

Water does not come out of radiator

I went to bleed a radiator today and although a little bit of air came out, it stopped and no water came out even though the heat is on. I went to the boiler and the pressure was only 8 PSI. There ...
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3answers
3k views

upgrade circulator pump in closed hot water heating system?

boiler is Weil McLain Gold CGa. current circ pump is Taco 007-F5, installed on return side, pumping water down, and into the boiler. I'm pretty sure this pump is under-sized, as the specs list a ...
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1answer
445 views

Finding the "C" Wire on old Honeywell L8048G Controller/Relay

Need to add a "C" Wire for an older Honeywell L8048G Controller with built-in 24V transformer in order to connect an Ecobee3 thermostat. Attached is a copy of my current wiring diagram (pre-Ecobee3 ...
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1answer
416 views

Tri-Level Home, 3 Zone Boiler heat, Lower Level is FREEZING, No Heat???

We live in a tri level house in WI. The boiler heats via baseboard on the main and upper floors, but in the lower level the hot water pipes run through the floor itself, basically giving us a heated ...
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0answers
54 views

Why is the hot water pipe from this small boiler norprene, not metal? And could it be replaced with a metal pipe?

The diagram (full pdf instructions here) is of a small boiler that fits under a kitchen sink, and keeps a small amount of water constantly near boiling which you can use for cups of tea etc. (its my ...
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1answer
91 views

How do I undo this connection? [duplicate]

How should I undo this connection? It doesn't seem to unscrew, though part of it will move down towards the boiler although this doesnt seem to make it disconnect (I havent tried forcing this though ...
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2answers
805 views

any sort of inflatable cork to plug pipe when shutoff valve is being repaired

I need to fix some leaky return shutoff valves on a hydronic heating system. Is there such a thing as an inflatable device that can be used to plug the pipe to prevent the system from draining while ...
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2answers
3k views

ecobee3 thermostat on old 2-wire boiler

Situation: 2 lugs on boiler control, one I'll call "red" or "R" that comes from the built-in transformer with ~14v and one I'll call "white" or "W" which, when jumpered to R, turns on the boiler. ...
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1answer
7k views

Repressurising Logic Combi 24 boiler

I bled a rad that was cold at the top, and not much water escaped. This fixed the rad, but the pressure in the boiler dropped to just below 0.3(It may have been low to begin with, since I hadn't ...
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0answers
109 views

Loud buzzing from hydronic gas boiler

I have a 105K BTU Raypak radiator boiler, similar to this one but a slightly older model (I guess mine is about 15 years old). The boiler heats and pumps hot water to 8 radiators throughout the house. ...
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1answer
1k views

How to tell if an air-separator is working

We have a Spirovent Air-Separator on the hydronic heating system, between the boiler and the circulator. How to determine if it is working properly to remove dissolved air bubbles and has not been ...
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1answer
4k views

Does it matter which 24v line I use to splice a common wire from?

I have a RayPak boiler that currently has a W and R wire only. In wall i have a 5 connector thermostat cable so I have three extra wires I can connect to. I'm a little unclear if it matters if i ...
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2answers
171 views

Peerless Boiler proper pressure causing flushing sound?

Our radiant heat boiler tends to "flush" very loudly every night. It seems to go on for awhile too. We have three zones and I think it just happens with the one zone in our bedroom. From my ...
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1answer
981 views

boiler cuts off at different temperatures for domestic hot water and radiant heating

When there is a call for heat from the house thermostat, the controller in the well of the boiler, which is set to 180F, shuts the boiler off when the boiler temp reaches 190F according to the ...
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1answer
1k views

Leak underneath flooring, hot tiles, please help! RESOLVED

I appreciate any advice on how to fix a leak from under my bathroom shower floor. Water was flowing from the baseboards of the walls (about 1 liter), causing them to bulge and become disfigured, but ...
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2answers
95 views

loosening tan-colored thread-lock compound on black-iron pipe

I need to replace the 4 gallon Amtrol expansion tank on my hydronic heating system. The tank is threaded into a black-iron 90-degree fitting; whoever installed it originally used a tan-colored thread-...
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388 views

single radiator whistling and whirring on and off (hot water system)

As the question stated, I have a single radiator whistling and whirring on and off and I am trying to understand the cause, so I can stop it. It is a fairly high pitched whistle/whirr/squealing sound. ...
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3answers
7k views

Is there a way to put Taco zone valves in a closed position?

The Amtrol expansion tank on my boiler needs to be replaced but the installers did not include an isolation ball valve. I can close the returns, but the water will still drain down from the upper ...
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2answers
993 views

Wiring a C (common) wire to a Triangle Tube Prestige Excellence 110?

Wiring noob here. Can someone give me step-by-step instructions for where and how I should attach a C (common) wire to a Triangle Tube Prestige Excellence 110 boiler for a ecobee3 thermostat? I think ...
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1answer
466 views

How can I tell when my steam boiler needs water?

I just moved into a house with a gas-boiler steam system that provides heat (in-floor) and also runs the hot water tank. It works well enough but the floor heat seems a little weak. In a previous ...
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1answer
60 views

Gas combi boiler raditator flushing to clear dirt

When I flushed my radiator, I have noticed that there is lots of sludge in the water. In order to remove the sludge from the heating system, I would like to Turn off the Worcester gas boiler Open ...
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1answer
408 views

Should an auxiliary circulation pump be installed on the supply or the return?

I'm adding a new 007 Circulator Pump for closed loop system. Problem is that one of the radiators on a third floor does not heat- tried purging air (it's a new added radiator). It gets hot when I ...
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1answer
112 views

For increasing shower pressure, Mixer or thermostatic valve?

I all, I'm looking to purchase a new shower for my combi boiler and am looking to maximise water pressure output. I'd like to know what one produces better water pressure? Mixer based or TRV ...
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1answer
350 views

How to handle unattached ground wires in boiler fusebox/control panel (sub-panel?)?

I don't have enough of an understanding of HVAC to know if the pictured boiler fuse box is considered a control panel or a sub-panel - but some wiring issues there lead me to needing to understand ...
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1answer
232 views

Boiler system shows different pressures

I recently had to change the expansion tank on our boiler. I decided to add a shut off with drain as well as a pressure gauge to make it easier going forward. I've come across a problem. The pressure ...
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2answers
277 views

What could cause only one radiator to not become warm? [duplicate]

I have gas powered hot water heat in a home I purchased. When I tested it this morning I got a lot of whistling and other noises that subsided for the most part. After the heat had run for 20-30 ...
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2answers
2k views

Y Plan Sundial - 150V on orange wire, boiler stays on in heating only mode

I have a Sundial Y-plan configuration. The 3 port midposition valve is a Honeywell V4073A and have a Worcester Greenstar 18ri. After replacing an older 3 port valve which had become stuck with the ...
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1answer
78 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
225 views

Re-pressurize boiler / change expansion tank

I have a question about how to pressurize system when replacing expansion tank. I have successfully taken the old tank off, and am about to go buy a new expansion tank(hopefully already pressurized ...
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2answers
2k views

Can I attach the hot hose from my washer to my boiler relief?

I just moved into an older house and there is only a cold tap for the washing machine. The machine is located right next to the boiler so I was wondering if I could just attach the hot water hose to ...
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1answer
1k views

Is this my stopcock / stop valve?

I need to locate my stopcock / stop valve, but am not sure how to find it. I live in a flat the UK, within a house which has been converted into three flats. However, after looking at pictures of ...
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2answers
212 views

Understanding my combi-boiler

I've just moved into a new flat which has a combi-boiler taking cold water in at mains pressure, and I'm trying to understand how it works. Specifically, I'm trying to understand how I can get maximum ...
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2answers
180 views

What is the name and function of this thingy seen attached to many boiler pipes?

I see this a lot but not sure what it's called or what it does?
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1answer
72 views

Should I perform annual maintenance on our heating boiler?

We are new to having a boiler in our house. Should we be doing an annual inspection and cleaning of our boiler? One was done last summer. How often should the system be purged too? Thanks for clearing ...

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