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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combi boiler shuts off after a couple of hours

hi my combi boiler keeps switching itself off after a couple of hours running on the timer. You only realise when the room starts to go cold. You have to switch the boiler itself off for about 10 mins ...
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2answers
65 views

Would upgrading hot water radiator heating result in much better efficiency?

My wife and I are thinking about buying a funky old house where we live, in southern Ontario, and trying to prioritize upgrades. There's a lot of knob and tube to replace -- top priority -- and some ...
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1answer
38 views

The hot water is working but the radiators will not heat up!

We have a Utica Boiler model number SFH4150WT and we are receiving hot water but the radiators do not heat up!!. We tried bleeding the radiators, they only heated up a little bit but after about 5 min ...
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1answer
21 views

How can I reset my Baxi Combi Duo-Tec HE boiler after a gas supply fault error?

My boiler is giving me some real problems, for whatever reason, it's not resetting as it should. I ran out of gas last night and since ice put some on and tried to reset, it still thinks there is a ...
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23 views

boiler fires up and stop and won t fire up again [closed]

my boiler fires up for 15 minutes and then stops and won t fire up again. Whenever I drain water off of it. It fires up and shut down again after a few minutes
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39 views

How would I size a heating system that would only be used to warm the floors?

I have a forced air heating system that works well, and I'm not looking to replace it. However, I'd like to get the "warm floors" effect of radiant floor heating. I've heard that with a lot less ...
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1answer
31 views

Represurise Vaillant Turbomax gas boiler - turning filling screws, but won't fill

I have a Vaillant Turbomax boiler (unsure of exact version as I don't have the manual). The pressure is a little low so I'd like to refill. I've followed these instructions: ...
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1answer
60 views

Replacing leaking Scalemaster scale inhibitor

I've just discovered that my "Scalemaster Electrolytic Speedfit Scale Inhibitor" has a pin prick leak in it. This device is sat between a copper pipe going to the combi boiler (I have assumed) I've ...
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1answer
47 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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1answer
24 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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1answer
74 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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1answer
94 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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46 views

What can I do if my wood boiler keeps tripping the high limit switch?

I just installed a outdoor wood boiler and added 2nd thermostat in house. When I start wood boiler the high limit switch gets hot and trips. The only way I can keep it going is to put a jumper wire in ...
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1answer
86 views

What does code 15 on a pennco gas boiler series 15b mean?

I have new pennco gas boiler,series 15b. It reading the code sta 15. I don't understand the explanation for code 15 in book. I think it may have to do with thermostat?
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1answer
25 views

Does C&M MX24 have a constant pilot light?

In disputing the reading that our gas meter has in a usually empty property, British Gas are claiming that every boiler has a permanently lit pilot light. I'm pretty sure that isn't the case with some ...
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2answers
457 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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1answer
88 views

Which is better indirect or tankless hotwater heater

I am in the process of getting my boiler and hot water heater replaced. One company gave me a quote for a Weil McLain boiler and indirect hot water heater. Another company gave me a quote for a bosh ...
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1answer
59 views

Can I have a washer, electric dryer, oil tank, and oil burner all in the same room?

Is it safe to have the washer and an electric dryer in a basement room with an oil tank, oil burner for water baseboards and water heater?
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1answer
190 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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1answer
1k views

Where do I connect my C wire from my thermostat when there are two transformers?

I have a Laars gas boiler that has 3 heating zones. I want to replace the old mercury honeywell tstat on the 1st floor (heat only) with a newer honeywell RTH9580 wifi model. I've taken pictures of my ...
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3answers
122 views

How to accurately judge economics of converting from oil heat to liquid propane?

I have an oil boiler in my house (boiler and burner about 27 years old) and, as part of a renovation project, I may upgrade to something more efficient. I thought I would have to stay with oil because ...
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1answer
461 views

Can I have a separate thermostat for a wood boiler?

I want to wire a separate thermostat for my outdoor wood boiler so that just the furnace fan will come on without the propane kicking on. This is a Coleman furnace. Is this possible and if so, how ...
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2answers
56 views

What problems could be caused by putting mains water in to the pipe from a shared water tank?

I'm having a boiler replaced and have chosen a combi boiler. One of the benefits is mains water pressure hot and cold water where previously I had low pressure coming from a tank. The boiler is in ...
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44 views

Boiler clanking noise

I woke up this morning to a really loud clanking noise from our boiler. It is a newer gas boiler installed in 2007. There are two Taco circulators 007-F5-71FC for first floor and second floor. I ...
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267 views

Why does my oil-furnace's on-demand water heater go tepid and then return to full heat?

We have an issue with the hot water from a 2004 Peerless oil furnace with on-demand hot water. The shower starts at full temp, but quickly goes tepid (too cool for a bath/shower, but not ice-cold) and ...
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25 views

How can I reduce the noise from an HE boiler vent?

I have a HE boiler that is direct vented out the side of my house on the neighbors side, they find the 'roar' of the exhaust to be very annoying. Have anyone tried troubleshooting these to ...
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16 views

Weather compensation, zoning or both?+ minimum output

I am renovating my 4 bed Victorian house with solid walls. We are about to replace the boiler and I am looking at a Worchester bosh 36kw cdi compact with WF100 weather compensator. I also want to ...
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1answer
110 views

Electric Radiant heating Vs Hydronic - What can I get?

I have a carport that was closed in to become a 3rd bedroom in our house. It has a low ceiling of approx 8 or 9ft. I gutted the whole room so it's down to the slab right now. I'm in the process ...
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2answers
217 views

Who should I contact to remove an old boiler from my basement?

I had a boiler fire. When I replaced the boiler, I kept the old one around for insurance purposes. Now it's time to get rid of it. It's got a good bit of steel in it, and still has a couple of steel ...
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64 views

Replacing drywall above boiler… to Code? Inspection?

I own a mid-1800's house in New England, with a fieldstone foundation and dirt floor basement. I now have a mold problem in the basement. There is lone sheet of drywall above the boiler & water ...
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1answer
125 views

Would connecting the downpipe to a gas boiler inlet save energy?

I have a condensing gas boiler for tap-water and central heating. Not very far from the inlet there is a downpipe outlet for the sewer. Since this smelly pipe is partially filled with the same ...
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96 views

Diagnosing boiler problem. Strange noise and pressure released

Woke up to a loud almost grinding noise coming from all the radiators/pips in my hot water heating system. It's intermittent, every few seconds but the system is generally running louder than normal. ...
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52 views

honeywell l8124a114 adding c wire thermostat

Only have two wires. Red and white. Relay at boiler has two existing wires hooked to indicators T and T. Which connection would I use in this system to add the c or constant. Following are locations ...
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1answer
1k views

Need help running and connecting a 'C' wire to my new thermostat [duplicate]

I have a Laars gas boiler that has 3 heating zones; basement, 1st floor, and 2nd floor. I want to replace the old mercury honeywell tstats on the 1st and 2nd floor with newer honeywell RTH9580 wifi ...
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2answers
57 views

Metering gas used for heating water in a multi-dwell building with one boiler

I rent in a multi-dwell building. We are not directly charged for hot water but trying to figure out if we are indirectly charged via the Con-Ed gas bill. Is it possible to meter gas usage for the ...
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545 views

Water not circulating in one radiator on a hot water boiler

My boiler has 4 zones. Zone 1 is the bottom floor. There are two radiators in zone 1. I am replacing one of them, an old baseboard radiator, with a cast iron with similar BTU. We hooked up the new ...
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1answer
26 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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1answer
431 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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2answers
126 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
778 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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1answer
7k views

How do I bleed baseboard radiators without a bleeder valve?

I recently bought a newly remodeled 1950's era house about two months ago. It has a Weil Mclain fuel oil boiler that provides heat to four different zones (loops) in the house. Each zone has a couple ...
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1answer
95 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
3k 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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1answer
150 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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1answer
381 views

How should I attach a C wire on my chromalox boiler?

I have a chromalox canada boiler model EDB-2. Recently I purchased a wireless honeywell transponder and thermostat, and am trying to install them. I currently have W and R wires but am missing a ...
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2answers
405 views

Should I replace my Pressure Reducing Valve?

A few weeks ago, my oil-fired water boiler started continuously leaking water out of the pressure release valve on the top of the unit. I know this is leaking steadily because it drains into a 5gal ...
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479 views

What might cause the heating to get “stuck” off regardless of room thermostat?

What could cause my heating system to get "stuck" in a state where the boiler will no longer come on in response to the room thermostat, and I can only seem to "fix" it by turning the property power ...
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2answers
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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1answer
162 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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2answers
12k views

How do I identify the C terminal on my HVAC?

How do I identify the C terminal on an HVAC, furnace, or boiler? If the terminals don't have a screw labeled C what should I look for on the wiring diagram? What steps should I take if a wiring ...