For questions regarding a central heating system for the home. The system consists of a furnace or boiler and a method to distribute the heat throughout the home.

learn more… | top users | synonyms

8
votes
1answer
1k views

How do you trigger the hvac with wiring only?

I have a HVAC that has the usually wiring C R G W Y Pinouts What wires do I need to connect to turn on Heating? What wired do I need to connect to turn on the A/C? Is there a risk of damaging any ...
7
votes
4answers
7k views

Is it an easy task to replace a wall thermostat?

As above, is it an easy DIY job to do this safely? In my research into the above it has become apparant that I should consider replacing the old thermostat with a programmable one for energy savings. ...
7
votes
2answers
2k views

Why are almost all of my house's HVAC floor registers placed near exterior windows?

My current house is a single story built over a crawlspace and all the HVAC registers are in the floor. In all of the larger rooms, at least one (and usually more) register was placed near an exterior ...
7
votes
1answer
407 views

Why did an HVAC installer add this PVC pipe?

We recently had a VERY old central heating furnace replaced and I noticed that the HVAC installer added the following PVC pipe shortly before the inspector arrived: The metal vents were already ...
6
votes
3answers
337 views

How can I locate the pump in a wet open-vented central heating system?

Lost: One Central Heating Pump. Reward offered (in reputation points ;) I have a wet open-vented central heating system, and I've turned it on after six months to find the radiators aren't getting ...
5
votes
3answers
1k views

Can I close the garage vent on my furnace?

My furnace duct system has a vent in the garage, right over the furnace. Is it necessary for the proper operation of the furnace to keep that open? I'd hate to waste the money heating up my garage, ...
5
votes
1answer
608 views

Radiators need bleeding regularly (at least once a fortnight) - why?

Last winter, our radiators regularly lost their heat and consequently needed bleeding frequently. I couldn't see any obvious leak. What could be causing this and what should I check for?
5
votes
2answers
2k views

What materials can be used to create cold air returns?

To make a cold air return duct in my wall, can I simply use the studs and drywall to create the duct or do I have to use sheet metal also?
5
votes
1answer
176 views

Are discount furnaces safe to use?

More newbie questions ;-) The house we're looking to buy has an older furnace that "may be manufactured by the Permier/Consolidated furnace company" according to general inspections. We're in the ...
5
votes
2answers
1k views

Does a software-controlled central heating programmer and thermostat exist?

I have a central heating programmer in the airing cupboard (where the hot water tank is). It allows a couple of separate schedules for water and heating separately, and also for manual override when ...
5
votes
3answers
2k views

Why do I have a cold draft from a return air vent?

I have a draft occurring in my 2 story home, usually on windy days. The main floor is fine, but in the master bedroom on the second floor, there is cold air entering the room from the air return vent. ...
5
votes
2answers
6k 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 ...
4
votes
1answer
927 views

Why are steam radiators used in the USA?

In the UK, we use water radiator systems when the boiler heats the water to about 70°C, this allows the boiler to get most of the energy out of the gas (or oil) by condensing the steam you get ...
4
votes
1answer
164 views

How to disable this timer?

Is there a way to completely turn off this timer?
4
votes
3answers
6k views

Why is it taking so long for my house to heat up?

Firstly, I should probably mention that I'm in the UK... My wife and I bought a house new from a builder over 9 years ago and have had no problems whatsoever with our central heating system in that ...
4
votes
1answer
374 views

What does a manifold do in an underfloor heating (UFH) system and why do they cost do much?

I am trying to understand what the manifold does in a UFH system. It seems to just be an overpriced collection of T joins connect in a row with a basic valve on each. What am I missing?
4
votes
1answer
233 views

Is it cost effective to close some heating vents?

I have a central natural gas forced-air furnace in a small (1500 sq. ft.) home. I have an unfinished main room downstairs and a room for storage upstairs that's not being used as a bedroom. Is it ...
4
votes
1answer
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 ...
4
votes
1answer
571 views

Should central heating pipes through internal brickwork have insulation?

My house has old (large diameter) steel central heating pipes. These travel through the basement before passing up through the house. My concern is that when they pass through internal walls they are ...
3
votes
2answers
156 views

What to do about furnace that's drawing gas odors into the room instead of heat?

I have a gas furnace. It was heating up the place fine and worked for years until the other day. All of a sudden it started drawing air that smelled like strong gas odors into the room rather than ...
3
votes
2answers
5k views

What is wrong with my central heating?

I have a central heating system that was installed in this house in 2006. Tonight, while I was taking a nap my wife said that she suddenly heard a loud whine/whistle sound that slowly lowered in ...
3
votes
1answer
3k views

Can I convert a radiator to radiant floor heating in a room?

I am purchasing a new home, and designing some renovations to several rooms. The house has a gas boiler and radiators throughout the house. For the kitchen and upstairs bathroom, I will be putting ...
3
votes
1answer
2k views

What does C, W, Y and S Plans mean when talking about central heating controller?

I have seen control systems sold as C, W, Y, or S plan, what the difference? Are there any other common setups (These are water based CH systems, so are unlikely to be used in the USA)
3
votes
2answers
489 views

Where can I find central heating system with radiators?

Coming from Europe, I am used to radiator heating systems and thinking about putting one into a fixer-upper house I intend to buy. Where can I find such a system in the North-American market?
3
votes
2answers
127 views

My hot water boiler failed **On** - what would cause that?

I arrived back from holiday to find the house like a sauna, everything in the kitchen too hot to touch, cutlery scalding hot etc. My central heating was on full, and must have been for some days. ...
3
votes
2answers
452 views

Replacing a ceiling register cover

I was replacing an old ceiling register cover in my house but I found the screw hole on one side of the opening is kind of loose. Is there a way to patch up the mount point so the cover is fully ...
3
votes
2answers
1k views

Can a cold air return be shared by two rooms?

Can I use the same cold air return duct in a wall between two rooms? For example, the duct would run down the wall between the studs and then could I put the register at the bottom of the wall on both ...
3
votes
2answers
216 views

Can upgrading my boiler save me money?

I've just received my annual gas usage statement. It came as a surprise to me that I'm using almost the average gas consumption in the UK. The average is 16,500kWh and I used 15,000kWh over the year. ...
3
votes
2answers
375 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 ...
3
votes
1answer
188 views

Where can I find resources on Gas Furnace manufacturers

We are going to replace a 30 year old residential gas furnace. We have estimates for furnaces from Rheem, Trane and Bryant. This is a rental, so we aren't going for the 95% with tax rebate but ...
2
votes
4answers
7k views

Why can't I bleed my radiator?

I am living in an apartment in Belgium. My bedroom radiator is basically useless; it's about 1m long but only the left 10cm ever gets warm. I have been told to bleed the radiator by opening the valve ...
2
votes
1answer
705 views

Cheaper to run central heating sporadically high or constantly low?

My central heating has a thermostat dial ranging from 10 to 30 degrees Celcius. I'm wondering whether it's likely to be cheaper to crank it up to 30, and turn it on for, say, an hour, 3/4 times per ...
2
votes
2answers
690 views

Using a solar system with a condensing boiler for the central heating instead of tap-water?

According to the manual of my AWB ThermoMaster 2HR 28.02WT Condensing boiler, it is compatible with a pre-heating solar system for tap-water only. It even has extra facilities to ensure that the ...
2
votes
2answers
752 views

How do I lower a cold air return from the ceiling for a basement rental?

I am living in the basement level of a rental unit with forced air heat. There are 9 heating vents and one cold air return, all of which are in the ceiling. The air isn't mixing very well resulting ...
2
votes
4answers
399 views

How do I fix radiators that come on at different times?

We have radiators in all rooms but the ones in the bathrooms come on at different times to the rest of the house. This is particularly annoying when getting up at 6am and stepping into a freezing ...
2
votes
3answers
2k views

How can I improve hvac air flow to my attic?

Two years ago I converted the attic of my 1.5 story house into a livable space. It had no HVAC ducts going up, so I ran some coming from the basement where the furnace is. Air flow to the attic via ...
2
votes
2answers
659 views

Central heating pressure dropping

Some time ago, I asked this question. The problem I had was that the pressure in my central heating system was dropping, and I couldn't find the leak in the system. I'm now convinced that I don't ...
2
votes
1answer
167 views

What to look for in a new water radiator?

The water radiators I have under each window are 50 years old, and I would like some new ones. They measure HxLxD 50x100x20 cm. The new ones I would like should be as thin as possible. I live in an ...
2
votes
1answer
777 views

When bleeding radiator why does the same amount of water go out through the overflow?

I have a really old central heating system. It was working fine until a plumber bled the whole system to replace a radiator. Since then we have had to replace the pump and the system doesn't seem to ...
2
votes
2answers
3k views

How can I tell what kind of heating system I have?

Seems like a simple question, but I've had a very hard time finding a definitive answer to this. I went to the hardware store to buy a replacement for a faulty thermostat and when I arrived and ...
2
votes
2answers
56 views

1971 D615MH Coleman Furnace,

I have a Coleman D615MH furnace. It will not kick off. I have to turn both breakers off. I just replaced the thermostat, thinking that was it. I turned the breakers on & it was still running. ...
2
votes
1answer
363 views

What would cause the bottom half of a radiator cool down after heating up?

I have a one pipe system and just had a new Vertex vertical radiator fitted. It's the last radiator in the circuit. The radiator I had replaced for the vertical radiator worked like a dream for the ...
2
votes
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?)
2
votes
0answers
74 views

Why would the input gas pressure fall when the central heating boiler calls for heat?

Since the annual service of my traditional gas boiler the house takes considerably longer to heat up. The boiler flame no longer seems as "fierce" as previously. I'm told the burner pressure and ...
2
votes
0answers
98 views

Why aren't my radiators heating up after I replaced a rusted through pipe?

We had a bit of corrosion in an old pipe and it started leaking and losing pressure and so I drained all the central heating system (radiators), replaced the pipe and fitting. It was awkward and the ...
2
votes
0answers
186 views

Are w1 and w2 both energized during a second stage heat call from the thermostat?

Short version: does two-stage thermostat always close W1 circuit when it closes W2 circuit, or they might be closed independently? Long version: I have two-stage furnace, currently connected to older ...
2
votes
1answer
380 views

Furnace Draft Inducer Repair: is previously installed back plate necessary?

I'm replacing a non-functioning draft inducer on the Goodman furnace in my house (GMP075-3). The previous inducer was mounted with a sheet metal back plate between it and the wall of the furnace. ...
2
votes
1answer
1k 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. ...
2
votes
0answers
232 views

Why won't my condenser turn on when I run my heat pump?

I have a York Affinity condenser. When I run my heat pump, I expect it to turn on somewhere in the cycle but it doesn't. It generally does this once a year. The usual fix is to cycle the power of the ...
1
vote
2answers
889 views

Anyone heard of painting asbestos insulation tubes?

We recently had an old furnace inspected and the heating specialist mentioned that he suspected that the heating ducts had asbestos. He suggested painting them as an alternative to expensive removal ...