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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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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43 views

3 zone boiler heat, one zone is too hot

I have a 3 zone boiler heat system, one t-stat for each floor. It's worked fine for years except twice in the past few months. The first time I was out of town and my wife called and said the upstairs ...
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2k views

How to repressurise a Baxi Duo Tec Combi 24 HE boiler

I'm currently having trouble trying to repressurise my boiler. Unfortunately, the YouTube tutorials and the manual look different to mine! I've also added photos below to help. Any help would be ...
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101 views

Glow worm micron 50ff — re-pressure?

My Glow Worm Micron 50FF boiler's pressure was yesterday reading at a pressure of 1 (mbar or PSI -- not sure which) but the red fixed line shows as 2. I had a look in the manual and it suggested that ...
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1k 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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4answers
6k views

Why is my Central Heating taking so long to heat up?

I'm in the UK with a small modern, well insulated, double glazed home heated by a traditional gas boiler. My heating had been achieving room stat temperature within 30 minutes but is now taking at ...
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119 views

How to test Honeywell aquastat L6006C?

my circulator pump isn't working properly with my boiler system, trying to narrow down problem. I've read you can test the aquastat with a multimeter (which I have but have never used). The reason I ...
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9 views

Why Vaillant ecoTEC boiler doesn't start?

I've Vaillant ecoTEC pro 24 (VUW GB 246/3-3 R1) gas boiler which was working fine. Recently I've accidentally switched off the boiler for the night. The next day when I've tried to switch it on, it ...
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46 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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126 views

need help with completing Zone, Thermostat and low pressure wiring for a Alpine Boiler ALP150

i have completed most of the connections to the boiler expect for Zone values, Thermostat and low pressure monitoring. i need help with understanding if i need to purchase a 24v transformer ? and ...
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42 views

Could a leaking boiler be fixed?

I'm having a leaking hole in the cast iron boiler tube so does it mean that its time for a new boiler or is there any way it could be permanently fixed?
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10k 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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36 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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104 views

Swapping out Nest for Ecobee - c-wire issues

We are trying to replace our nest with an Ecobee (with remote sensor capability). We have an existing Nest thermostat which was installed on our boiler/radiator system last year. Back then, we had ...
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20 views

How do I replace a boiler condensation pipe? [closed]

I ended up calling a plumber and he told me that it was a condensation pipe for the heating system that was corroded and leaking behind the wall. The pipe was supposed to be a return for the condensed ...
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41 views

Nest thermostat - combi boiler and UFH set up question

We recently had some work done, a new open plan room, a new boiler and underfloor heating (UFH) put in. We had some confusion, a lot of which comes from not having a basic understanding of how the ...
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41 views

Installtion of a 24v motorized damper to a HW boiler control box with a transformer (120v/24v)

Is the control box on a HW boiler at port Tw/Tr the right place to connect a thermostat wire from a 24v motorized damper. using it strictly for additional combustion air? cowboy
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42 views

What could be preventing the heat boiler from circulating water upstairs to the radiator, frozen pipes?

I recently bought a Cape Stye house and it is equipped with a Weil McLain Series 1 Boiler. The boiler is up and running fine except it is only heating the first floor; the base board radiators ...
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58 views

Can baseboards be used in one pipe steam heating system?

I just switched to natural gas and had a new Weil-McLain steam boiler installed. (I originally had an oil boiler with steam heat.) It is a one pipe system and I have the old style radiators, except ...
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33 views

Risk of leakage when changing open-vented to sealed-system boiler

Apologies in advance for the long post. I currently have a gravity-fed, fully-vented central-heating (CH) and hot-water (HW) system (large cold-water tank and expansion tank in the loft, hot-water ...
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61 views

PVC Water line keeps getting pin holes

The water line that goes from my boiler, carrying warm water keeps getting pin hole leaks. The line is a standard flexible white plastic insulated pipe, covered in a red mantle. About a year ago, ...
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32 views

Should condensate pipes from boilers drain on a gradient?

I have just purchased a new flat, and noticed that the condensate pipe from the condensing boiler drops c. 1.5m down from the wall, and then has a 90 deg bend onto a 2m flat run before draining into a ...
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2answers
1k views

How is a high altitude natural gas burner different?

What is the difference between high altitude natural gas burner and conventional low altitude gas burner and why high altitude natural gas burner are needed?
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32 views

Hydronic Heating: Noisy pipes in the basement/walls

My issue is i have a natural gas boiler + hydronic heating system (two zones). It seems that after I remove air from each zones, the heating system is quiet until 12 hours later. In the early morning ...
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4answers
50k 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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137 views

How can I know if my boiler is supported by Nest 3rd Gen thermostat?

Here are the pics How do I know if my hot water boiler is compatible with Nests domestic hot water control
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41 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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35k 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 ...
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1answer
17 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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27 views

Gym Equipment in the Oil Tank Room? [closed]

I am thinking about getting an elliptical for our home. The only space it will fit is in the room where our oil tanks are located. Is it okay to workout in this room or is this a health hazard due ...
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35 views

How much air ventilation required for oil burner in a closet?

We are redoing our basement and closeting off the boiler and hot water heater. With our layout, it makes most sense to vent it out of the chimney. However, I want to make sure we are getting enough ...
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2answers
32 views

Is boiler connected up right

The plumber connected the cold water pipe to the red colored valve on the boiler and the hot water output pipe to the blue valve. Is this correct? We are having problems with the hotwater. We get a ...
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4answers
180 views

How to determine how many gallons of oil your oval tank holds?

I'm not sure if my tank holds 250, 275, or 300 gallons. Is there a way to determine the size? The tank is oval shape and 60" X 40" X 27".
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63 views

Rented Property: Install Nest

I have a Worcester boiler (Greenstar HE?), with a TR2 thermostat. I was looking at replacing the thermostat with a Nest (or equivalent). To complicate matters, I'm in a rented property, so I cannot ...
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206 views

New Thermostat Ecobee3 to Old Galaxy GG-75 boiler - Needs common wire

I would like to replace my old thermostat with a new Ecobee3 thermostat. HVAC system is a Slantfin Galaxy GG75 boiler - single zone. (No air conditioner.) Current set-up has only a red and white ...
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1answer
111 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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20 views

Are all boiler heating systems closed?

Are all boiler heating systems closed? In other words, are they all filled with water that is just constantly recirculated, or are there some that put the outgoing water elsewhere?
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430 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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1answer
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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29 views

Hot Water Baseboard is not hot, when purging out air, very little water comes out.

The Boiler is at about 20 psi on heating pressure gauge but I'm not getting heat through the base boards. I have 3 zones fed with 3 circulating pumps, one for each zone. On the return I have 3 ball ...
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24 views

Heating Not working but heating water kicks it in

My heating (gravity fed) is not coming in when the timer starts but the if the water needs heating it kick starts it. I thought it may be a thermostat issue because when I moved this to a point that ...
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49 views

How can I check if my boiler room thermostat is working?

I have an old Honeywell basic thermostat and I am not sure if it's working properly or not. I doubt it because the boiler stops burning after some time even when I set 30 °C on the thermostat and ...
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1answer
73 views

Boiler Won't Fire after adding Taco Relay 506-4 to Existing HW l8124a,c setup

Boiler: Tranco (can't find model or other info anywhere on it) Relay: Taco 506-4 (using Taco 007 calculator pumps) Aquastat: Honeywell l8124a,c I just finished installing two new zones and a new ...
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27 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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2answers
245 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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1answer
480 views

Where do attach C wire on my boiler?

I need to add a C wire to use my wifi thermostat. I have a 2 wire thermostat now. There is a third wire in the wall which runs to the basement where it is cut off. I can easily extend it to the ...
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6 views

Where do I attach the C wire on my boiler? [duplicate]

My previous question mentioned an attachment which I forgot. But I now see no wat to include an attachment. So I will add this: The White-Rodgers 1361 zone valve has five terminals arranged Like ...
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107 views

Why would my boiler's pilot go out after the hot water comes on?

I have a Potterton Prima 40B conventional heat-only boiler that was installed in 1999. The pilot light goes out after the hot water comes on. It will stay on if the heating is on, but about 2 minutes ...
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1answer
180 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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25 views

How effective is elevated concrete for insulating moisture?

I am replacing a boiler in my basement and the contractor told me it will be better for the new boiler if he build an elevated concrete platform on which the new boiler will sit. He says this will ...