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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Why am I not getting hot water from my tankless hot water heater?

I just bought my house last year. The previous owner had just replaced the boiler before I closed. I had oil delivered the day that I moved in. I had problems with the hot water right away as it ...
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1answer
813 views

Why do my downstairs radiators run colder than upstairs?

Our combi boiler in the loft (less than 3 years old Vaillant EcoTec) is heating the upstairs radiators nicely, but the downstairs ones are lukewarm to cold. I have opened all the radiator valves ...
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191 views

Why isn't water running through our radiators?

We had a plumber in today to bleed our rads. He also changed the batteries on the thermostat and fiddled around with the boiler. Since he left the temperature has dropped dramatically and he's refused ...
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65 views

How do I set the timer for a Baxi Luna boiler?

I cannot set the timer for a Baxi Luna boiler. I have tried everything. The heating will come on and off but not on the timer.
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247 views

How can I determine why there is no water coming from my hot taps?

I'm getting no water from any of the hot taps in my house. The cold water taps are working fine. The central heating is also working. I have a combi-boiler. It's been fairly cold today in London, so ...
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1answer
149 views

What does the low limit do, and where should it be set on an oil fired hot water furnace?

What does the low limit do, and where should it be set? My furnace has a honeywell triple aquastat relay and has a difference dial. Water temp is about 190 deg F. Also, water psi gauge is only ...
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1answer
697 views

How can I stop my house from waking my wife up every day in the winter?

I'd like to preface this post with the fact that I'm a complete diy amateur. I may say stupid things, or things that make no sense. Please feel free to correct me as I'm always open to learn. So, ...
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198 views

Why won't my propane boiler's pilot stay lit after replacing the thermocouple?

The pilot on my propane boiler won't stay lit for more than 30 minutes even after replacing the thermocouple and outside gas valves. The inside gas valve was replaced two years ago. Service people ...
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168 views

Could excess water in the boiler cause overflowing radiators?

The water level for my boiler seems to go above the labeled height. We now have a sporadic water leak that is not showing itself. Could it be that the excess water in the boiler is causing this ...
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2answers
981 views

Do I have to replace my expansion tank, or can it be drained?

I have no heating. My plumber tells me that my expansion tank has water in it and should not be hot and therefore needs replacing (expensive job). is this true. Can the water not be drained out? ...
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503 views

What could cause my Pennco 15045-vf cast iron furnace to not run?

My boiler is shutting down into lock out mode, but I don't know what's causing it? It will start on reset but shut down after a few minutes, but as of now it wont kick on at all. I checked the pilot ...
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4k views

Why does the pilot light keep going out on my natural gas boiler?

The boiler lit and ran the other day, but now the pilot light was out. I could hear a hum at the control. I lit the pilot light, but when I no longer pressed on the valve, the pilot light went out ...
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1answer
657 views

Can having two expansion tanks above a boiler cause it to over pressurize?

I have 2 expansion tanks on my hot water boiler. One tank is a newer model located above boiler. The second tank is hanging from rafters just above boiler. Is it possible that both tanks are filled ...
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2answers
181 views

Can I use domestic hot water from a gas combination boiler temporarily, while the pressure in the central heating circuit is low?

Due to work on the heating pipes, the central heating water pressure is low. Is there a safe way to use the gas combination boiler (Ferroli Modena 80 E, domestic hot water + central heating) for ...
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1answer
2k views

What should I do about this Alpha HE CB33 Boiler pressure error condition?

I have an alpha he cb33 boiler which has stopped working this morning. Yesterday I removed a radiator for cleaning then put it back on and re-pressurised the system. It was working ok last night. ...
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2answers
4k views

How can I stop the boiler from heating the radiators when only hot water is wanted?

I have Baxi Boiler (model unknown at this precise moment in time) which British Gas have fixed up to a seperate control panel (see image - not our actual panel, image from Google!). The problem is ...
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1answer
105 views

What is the cost of one percent efficiency on an oil heater?

We've now had about 7 contractors come to our house and give us estimates for replacing a) our oil heater (system from the early 1980's, estimated at around 65% effeciency), and b) our central air ...
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2k views

Should we turn our oil hot water heater off every night?

My husband and I are considering shutting off our hot water heater from 8pm to 8am every night to save on energy. Is such a time frame long enough to create a noticeable difference in our oil bill? ...
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1answer
400 views

What could cause my boiler to ignite 3 times then goes off?

My boiler ignites 3 times then goes off but the boile people came round and said it was the switch but after they went we turned the switch on and it worked but it goed on for like a minute and goes ...
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57 views

Can I use a water tank and pump to feed a boiler?

As the title suggests I would like to know if I can use a water tank and pump to feed my boiler? I want to get rid of my electric shower and currently I have large water tank with a pump feeding to ...
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1answer
331 views

How can I regulate pressure to a BAXI LUNA 240i boiler?

I need to increase the pressure to the boiler, how should i proceed? Checked on youtube and found a couple of systems but they do not apply to my model (at least not at first sight). Some pics here ...
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1answer
4k views

How do I restore boiler pressure through the filling tap?

I have a "Glow Worm" combi boiler that has been losing pressure slowly - from 1.0 bar to 0.6 bar over the course of a few months. The instructions simply say that to restore pressure, "slowly open ...
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2answers
477 views

Sizing DHW expansion tank for tankless heater

I have a combined boiler for hydronic heating and DHW. Earlier in the winter, I started insulating as much of the pipes I can easily access. This has led to hot water coming out of the cold water ...
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2answers
306 views

How to change water filter if the only valve is before the boiler?

How can I change the water filter if the only valve to close the water supply is before the boiler? If I just close the valve and unscrew the filter the hot water from the boiler will flow back? Is ...
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117 views

How to deliver hot water from bathroom to kitchen

My appartment (and all my neighbours as well) doesn't have hot water. So I recently purchased electric boiler (80L) and placed it in the bathroom. Now I'm planing to deliver the hot water from the ...
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1answer
159 views

I think I may have fixed my boiler but how could this have helped?

I am an unbelievably "low confidence" DIYer, having only ever rented properties, which limits the stuff you're supposed to do, for liability reasons. However, we had a boiler issue where it was ...
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1answer
259 views

Is it possible to recover waste heat from a boiler?

I did a google search and came back with industrial products, but no residential prosucts. I have a System 2000 boiler and hot water tank. When the furnace is firing, the temp of the exhaust through ...
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3answers
8k views

What is the proper way to drain a boiler's expansion tank?

The expansion tank is supposed to have some air in it, but I'm guessing that mine doesn't. Let's suppose (i.e. I'm making this up in the hope that someone will correct me) that the tank should be ...
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1answer
487 views

What alternatives are there to a gas boiler for private house?

I am looking for gas boiler alternatives for private house. At this moment I have found solid fuel boiler as replacement of gas one. Could someone suggest any alternative to gas technology or other ...
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1answer
731 views

What would cause a gas fired, forced water boiler to shut down?

I have a fairly old Peerless, natural gas fired, forced water boiler. It has an electric ignition system (White Rodgers 50E47-843 Universal HSI Ignition Module). A few weeks ago it shut down (safety ...
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1answer
3k views

Potterton EP3000 -> Horstmann C27 boiler programmer wiring

I'm in the UK, using an ancient tempermental Potterton EP3000 boiler programmer, but I have a brand new Horstmann C27 which I'd like to replace it with. Apart from the mains supply, there are three ...
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3k views

Why isn't water coming out of a radiator in my freshly pressurized system?

I live in an old Victorian with three stories, plus a basement and an attic. I tried to bleed the radiators in preparation for turning the heat on, but was unable to get any water out of the radiators ...
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472 views

A boiler and a hot water tank … what is this configuration? (UK)

I'm a west-coast American living in London. I grew up with baseboard and central forced air heating. I'm currently living in the UK where water radiators are common (if not pretty much the ...
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204 views

How do I know if my high limit and low limit are set correctly on my aquastat?

I have a boiler that is only providing heat for my forced hot water baseboard system (4 zones). I've always thought that the high limit on the aquastat was too low (the temperature on the boiler ...
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2answers
7k views

Why do the radiators in my home heating system get extremely hot?

I have a standard British heating configuration at home - there is one gas heater that provides hot water both for the boiler (and bathroom etc.) as well as for central heating. There is a small ...
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1answer
387 views

How do I insulate my Laddomat 21 boiler charger?

I have a mixing device Laddomat 21 installed for my boiler + accumulator tank. I have all pipes around the boiler insulated with pre-formed moulded mineral wool insulation, but there is no insulation ...
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1answer
185 views

Should my boiler be serviced annually?

I have a oil-fueled boiler that provides steam heat in the winter and hot water all year. Should I have it inspected and serviced annually? If so, what should such a service entail?
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3answers
828 views

Converting from Oil to Gas heat. Any recommendations?

I've received news that I'll need to get a new boiler. My wife and I want to take this opportunity to switch to natural gas from oil. I'm a technical guy, but I'm having trouble deciphering the power ...
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1answer
324 views

Is it bad/unusual for an oil burner to turn off then immediately back on?

We have an oil-fired hydronic heating system. The boiler is approximately 30-40 years old, and the system was checked and cleaned at the start of this winter. When the burner is running, you can hear ...
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3answers
4k views

Combination boiler pressure zero after heating

I generally don't notice a performance problem with the boiler, but after I run the heat to the radiators and turn the boiler off, after cooling down the the pressure gauge shows zero. I can easily ...
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1answer
688 views

Potterton EP3000 programmer HW and CH buttons not working

I've got a Potterton EP3000 boiler and the programmer won't respond to me pressing the HW and CH buttons. It was working fine until I switched off the power to the plugs (to do some electrics). After ...
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1answer
181 views

Pressure level in central heating system

Recently (since last week), the pressure in our heating system (as indicated by the pressure gauge on the boiler) is dropping rapidly. We're having to top this up around once every two days. As I ...
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2answers
384 views

Gas combi boiler - left running constantly in cold weather

I've a gas combi-boiler that is generally working fine, but we're getting some seriously cold weather here at the minute (for us anyway) and I've had the odd problem with the boiler starting up when ...
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1answer
1k views

How do I work out the CH boiler size we should have?

How do I work out the boiler size we should have? (I have been told we need a 18KW boiler for our large 3 detached bedroom bungalow in the north of the UK, is this really powerful enough?)
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1answer
77 views

Gledhill 450 Torrent RE

What is the top pipe connected to my Gledhill Torrent 450 RE thermal store? It comes out of the very top of the tank. Not on the side but right on the top in the centre?
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1answer
2k views

Should the sight glass of a steam boiler always be within the recommended range? Or only when firing?

We just had a new steam boiler installed and it is working great; all radiators are hot when the heat turns on etc. One thing I noticed though is that the site glass for the water level reads too ...
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4answers
23k views

The pilot light won't ignite on my boiler — what I should check?

We have just brought a new house and I can’t get the pilot light to ignite on the boiler, it is at least a few months since the boiler has been used. Where to I start on tracking down the problem? ...
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1answer
2k views

Should I use thread-seal tape for steam pipe?

I am getting ready to replace the pressuretrol of my oil-burning steam boiler, which provides heat and hot water. Should I use thread-seal tape (aka. Teflon tape, PTFE tape, tape dope, or plumber's ...
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4answers
1k views

Is it necessary to connect a boiler and gas meter to the main fuse box?

We are getting a new kitchen fitted. An electrical survey has been carried out by the compnay installing kitchen. they have said that, our brand new and recently fitted, boiler needs a earth wire ...
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1answer
1k views

Can I trust my pressuretrol?

My steam boiler, which supplies both heat and hot water, turned off a day or two ago, resulting in cold water. After some debugging, I found that the problem was with the pressuretrol, the device that ...