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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negative pressure/backdraft with boiler

Summary For heating in my house, I've got a Burnham Series 2 (model B) gas boiler, and with all the snow this past winter (I live in Boston) I've had problems with backdraft causing the boiler to ...
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1k views

Where's the C terminal on my boiler control?

The new thermostat I purchased doesn't run on batteries, and needs 24 volt power. I have only a red and a white wire connected between the boiler and the thermostat, but there is also a third, unused ...
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3k 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
383 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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415 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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2k 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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219 views

UK Vented Heating Problem - F25 Error on Glow Worm Boiler

We have had an intermittent problem over the last 4 months with our boiler cutting out with F22 and F25 errors (circulation fault/air in system etc...). Its a Glow worm Flexicom 18hx and has been ...
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67 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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225 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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149 views

How does a boiler pump circulate water?

I read this article (link) but I'm having trouble seeing how a tiny impeller like this (link) can actually move water up my seven-story building. I understand it's connected to an electric motor, ...
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3answers
8k views

Why don't my Radiators get hot?

When I turn on my heat, the pump attached to the boiler comes on but the pipes don't get hot and the radiators never do either. I've bled them and believe they are hot water radiators (since there ...
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1k views

Home heating fuel comparison (wood and heat pumps)

I'm investigating the most efficient way to heat my new 2000 sq home in New Hampshire and am having some difficulty working out the math based on the numbers I have found. I've found that wood is ...
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48 views

Is it dangerous to not replace a steam boiler pressure gauge that is stuck at 0?

Everything else works and it's heating fine. Let me know if you have more questions.
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559 views

Are uninsulated steam pipes behind walls and touching beams a fire hazard?

We are getting our unfinished basement done. We have replaced and rerouted (to make more space) our steam pipes (house built in 1937) with new pipes (Black and I believe 4 inches in diameter). These ...
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2k views

How far apart is it okay to set thermostat during night and day

This isn't home improvement, per se, so please feel free to let me know if there is a better forum for this. I have been told by two people, one of whom is a boiler repair technician, that it's not a ...
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2k views

Is basement smell caused by oil boiler?

Although dry and not moldy, my 130-year-old basement has a distinct basement smell that bothers my wife. I am trying to determine its source. We have steam heat. In the summer, the boiler is only ...
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18 views

Chromalux Electric Boiler Replacement for Radiator System

I have an old chromalux electric heater heating my radiant heaters. Would it be more cost effective to replace it with a gas fired boiler? - and would I have to replace the rads or just tie into them?
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270 views

Is this Radiator handle/valve a replaceable part? Do I need to drain the system first?

Perhaps a stupid question... The ON / OFF valve on one of my 1900s radiators does not turn. Pictures below. The radiator is in a permanent "hot" state. Is the "valve" (handle and "small nut") ...
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307 views

How to troubleshoot heat that's always on?

My boiler (Weil Mclain CGA Gold ~2003 install) failed the other day. After some help from a plumber and reading the manual, I replaced a few parts (more below) to get it running again. Now one zone is ...
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82 views

Second floor radiators only heat with all other radiators off

I have 2 rads on the second floor that will get hot water flow only when I stop all flow to the other rads on the system. Even then, the flow is very low. I have had this system for 10 years and ...
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405 views

Combi boiler lighting hourly to warm heat exchanger - is this normal?

I have an Ideal Isar HE24. It lights for 2 minutes once an hour to warm the heat exchanger and 'optimise delivery time for domestic hot water to taps or showers'... The problem is that this is ...
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363 views

Water supply valve to closed radiant heat system on or off?

I have a closed radiant heat system, meaning a boiler with a pump, radiators and piping. After the intake valve, there is a pressure reducer and a backflow stopper (both bell shaped). Yesterday, ...
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233 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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9k 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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1k 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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201 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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84 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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76 views

Should my boiler be warm to the touch?

I was lightly dusting my boiler yesterday and it was quite warm to the touch. The boiler is around ten years old and is tank fed. Is it normal to feel warm?
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131 views

Why does my boiler vent steam?

My understanding of a boiler system is that it is closed, meaning the water stays in the pipes and constantly recirculates. However, there is a vent (3" PVC pipe) that is connected to it that ...
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40 views

Boiler Resevoir Slow Leak

I'm a new home owner. My house is heated with steam radiators attached to an oil fed boiler. The boiler is getting close to retirement. One concern I have is that I need to drain water from the ...
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497 views

how to drain a single loop in one of my heating zones?

I have baseboard hot water heat. In one of my heating zones, there are three "loops". (i.e. shortly after the supply leaves the zone valve, the pipes split in three directions. These pipes then ...
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28 views

Shut down gas for heat boiler but did not shut down electricity

new to this house, didn't see the shut off switch when i shut down boiler two months ago. now i have found what looks like shut off switch, have I done any damage to the unit?
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149 views

How do we thaw pipes that froze after our boiler stopped working?

Our boiler stopped working. We got it working again and now have hot water but no heat in two zones. Temperatures have been -25°F with the windchill and the plumber thinks frozen pipes. How do we ...
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183 views

Is it possible to relocate my water heater?

I'm planning a complete refit of my bathroom, hopefully converting to a wet room, and I just wanted to get some idea of my options. The bathroom is (sadly) very small, around 1.7m x 2.3m. This is not ...
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110 views

Electric water boiler .. how is the system supposed to work? (UK)

I'm not from the UK and am used to water being heated on-demand by a gas heater. Having recently moved to London, the flat has electrical heating and I cannot figure out how I'm supposed to set this ...
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35 views

Need help with install for weil mclain oil boiler

I just bought a weil mclain oil boiler with tankless. Can anyone tell me the configuration to plumb it? I asked two heat guys how to plumb it and they gave me different setups. I plumbed it ...
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484 views

Can I enclose my new boiler in a closet?

As part of a new residential boiler installation, two 6-inch ducts venting to the outside will be installed, one near the ceiling and one near the floor. They won't be attached to the boiler itself, ...
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31 views

Boiler Temperature in oil system

Our complex winter-summer boiler control unit for an oil-fired forced water heating system frequently calls for a temperature that the boiler never achieves on a cold day. The burner will turn off ...
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862 views

Radiators don't heat up evenly, and am missing an Expansion Vessel. Do I need it?

I have a new Worcester 40CDI Regular Boiler that does not come with a built-in expansion vessel. I just discovered that the installer did not install an external expansion vessel either. For HW, I ...
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296 views

Shower water temperature problem?

My house contains 3 showers. Two of them warm up to where it's comfortably warm and one just warms up to a point where I don't freeze. Even if the shower is on the highest setting it still is not warm ...
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3answers
2k views

Combi boiler doesn't realise it's already lit

I have an Ariston Eurocombi (A23). The problem is it doesn't realise the flame is lit. When I start it up and cause demand (run hot tap or turn on heating) it fires up the flame correctly, however, ...
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173 views

How do I plumb radiators in an off grid cottage?

I have a cottage that is off grid. I want to plumb radiators on it that wont use a pump, or minimise usage of a pump if at all possible. What is the best way to do this? Hot water tank is raised to ...
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2answers
5k views

Can a boiler water feed / pressure relief valve be repaired?

I am a homeowner trying to troubleshoot my hot water boiler system (Winkler Gas Boiler). I noticed recently that my boiler is reading zero pressure. The combination fill & pressure relief valve (...
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741 views

Thermostat / Oil Furnace Question

I have an old oil furnace and I am looking for some clarification as to how it is supposed to work. It heats water filled radiators through out the house. Currently it is connected to a thermostat ...
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1answer
353 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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361 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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1k 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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223 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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975 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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33 views

Honeywell VR8300A3500 Single Stage Heat Gas Valve to Ecobee3 with C wire

Hey everyone have a quick question regarding a honeywell VR8300A3500 Single Stage Heat Gas Valve and the introduction of a Ecobee3 wifi enabled thermostat with a "C" wire. just want to make sure i am ...