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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11
votes
2answers
110k 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 ...
3
votes
1answer
44k 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 ...
5
votes
2answers
44k 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 ...
1
vote
0answers
51 views

U.s. boiler / Burnham boiler alterations

i have a 203ncl-tei2 boiler installed in danvers Massachusetts. Regular elevation. This boiler also has a failed tejurland (universal control) powerventer motor on it that is only humming, not ...
3
votes
3answers
23k 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 ...
3
votes
3answers
9k 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 ...
3
votes
2answers
4k views

Mini-split vs gas boiler for heating

I recently had three mini-split heads installed, two downstairs and one upstairs, primarily for A/C. These are Mitsubishi units, rated down to -15C (or perhaps F, but it doesn't really matter for my ...
1
vote
1answer
4k views

How to connect c-wire to Burnham Series 2 boiler?

I am trying to install my ecobee 3 light but the previous thermostat did not use any c wire. Fortunately, there was an unused wire in the wall and I would like to set it up as a c-wire. The problem is ...
5
votes
2answers
298 views

Is storing hot water over 140F a regional requirement?

It seems to be "common knowledge" that to help prevent Legionella, hot water tanks/heaters should be set at 140F. This temperature is enough to cause terrible burns and scalding so devices like ...
3
votes
4answers
75k 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? (...
3
votes
3answers
5k views

How do I fill a hole surrounding a boiler flue?

The flue for my boiler has a large hole around it, presumably from when it was put in. I'd like to fill it in because it's unsightly, but in not sure of the best way to do it, as it's a large hole and ...
3
votes
3answers
13k 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 ...
2
votes
1answer
263 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 ...
2
votes
1answer
1k views

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

I'm a west-coast American living in London. I've mostly known homes with electric baseboard and central forced air heating, and a single hot water tank for showers and taps. In the UK hot water fed ...
2
votes
1answer
7k 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 ...
1
vote
1answer
1k 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: http://www.vaillantservice....
1
vote
1answer
205 views

How do a boiler’s autofill valve and expansion tank work together as a system?

How do the expansion tank and automatic fill / reducing valve work together in a hot water heating system? It seems to me that if the expansion tank is charged too high the autofill valve will never ...
1
vote
2answers
842 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 ...
0
votes
1answer
725 views

My boiler's gas burner tube is catching fire, how do I fix this?

About 1 or 2 times a week I hear a roaring flame when my boiler tuns on. I've check on it and it appears one of the boiler gas burner tubes is internally on fire (see video I took of it). What is ...
-1
votes
3answers
54 views

Hydronic boiler sharing 20A circuit

I would like to connect my hydronic boiler to a 20A circuit already loaded by a microwave and a range hood. The label on the boiler says it draws LESS THAN 12A. Does this run a risk of overloading ...