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central heating system

A central heating system provides warmth to a number of spaces within a building from one main source of heat. It is a component of heating, ventilation, and air conditioning (short: HVAC) systems, which can both cool and warm interior spaces.
A central heating system has a furnace that converts fuel or electricity to heat. The heat is circulated through the building either by fans forcing heated air through ducts, circulation of low-pressure steam to radiators in each heated room, or pumps that circulate hot water through room radiators. Primary energy sources may be fuels like coal or wood, oil, kerosene, natural gas, or electricity.
Compared with systems such as fireplaces and wood stoves, a central heating plant offers improved uniformity of temperature control over a building, usually including automatic control of the furnace. Large homes or buildings may be divided into individually controllable zones with their own temperature controls. Automatic fuel (and sometimes ash) handling provides improved convenience over separate fireplaces. Where a system includes ducts for air circulation, central air conditioning can be added to the system. A central heating system may take up considerable space in a home or other building, and may require supply and return ductwork to be installed at the time of construction.

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  1. M

    Central heating losing pressure all the time

    Every two weeks or so I have to go and top up the system because the hot taps are running cold. Boiler display is flashing 0.6 bar and I fill up to 1.3. I've had an engineer look inside the boiler and he can't see anything wrong. I've checked the pipes all over the house and cannot see any...
  2. C

    Y Plan, no hot water but heating is working when called

    Hi everyone, Looking for a bit of advice, recently went to a job where heating was operating when called for however not for the hot water. I have changed the 3 port actuator Honeywell head however this doesn’t seem to have solved the issue, does this mean that the programmer is faulty? Or is...
  3. G

    Central heating pipe routes

    I need to extend my central heating from my newly built extension in to the old part of my house. I need to feed 3 rads in separate bedrooms on the first floor and then to feed a towel rail in a bathroom a rad in the utility and a rad in my lounge on the ground floor. Can I run my 22mm flow &...
  4. H

    Water heating hammering

    Hello, I've just found this forum and wondering if anyone can please help us. We've not long moved into our new home. It's has Johnson and Starley warm air heating and hot water tank in airing cupboard. All has been working fine until yesterday. We had the water softener serviced and since then...
  5. J

    Heating Levers

    Hi all - can someone explain what the two black levers are in this picture? Are they for putting more pressure in the heating system? I have a Megaflow Eco Systemfit Unvented Cylinder.
  6. M

    1 pipe system, 2 downstairs rads not heating up properly.

    I have had a problem where 2 downstair radiators are not heating up the same as the rest of the radiators around the house, now previously i had an electric boiler which heated all the radiators just fine, but around a few years ago i had a gas one fitted and the radiators in the living and...
  7. T

    Demand for Heating Not Firing Boiler

    Hi, I have a Vailant EcoTec Boiler with a Megaflo. These are controlled by a Honeywell controller. I have one 3 port diverter, where one of the outputs goes to a 2 port diverter prior to the Megaflo (I believe this is some safety feature). I have run into an intermittent problem where some...
  8. D

    Boiler pressure dropping to zero when heating turns off.

    Good afternoon, I am experiencing a pressure issue with my heating system and was hoping to receive additional insight as to what the problem could be. We have a biomass boiler and stratification tank set up and recently had an issue with boiler pressure dropping off when the system was cold...
  9. K

    Understanding heating/water tank system

    Hi, We moved into a new property yesterday and are a little baffled by the heating/water tank situation. The previous owners unhelpfully left any kind of instructions/manual and therefore trying to figure out ourselves. We have what looks like a boiler/water tank system (coming from a standard...
  10. N

    Water Heating Wont Work Unless Tank Thermostat Is Turned up and Down Manually!

    Have a sytem boiler with unvented cylinder with 2 heating zones plus hot water in a house we moved into recently. To start with we were always amazed at the water pressure so on the odd occasion that the water was only luke warm it was easily forgiven, but over time we have come to realise that...
  11. P

    Refilling underfloor heating

    Hi, gotta a bit of an issue with refilling my underfloor heating. Am I right in saying that the flow meters along the manifold should be on the top rail, but as you can see they are at the bottom? Also have I got to loosen off the electrical actuators at the top to refill the system? Cheers
  12. S

    Repiping Central Heating System Advice

    I am repiping my whole house and changing from combi boiler to a 30kW system boiler & 250Ltr or 300Ltr unvented indirect hw tank. Can somebody give advice on my rough plans/sketches for repiping my radiators using 22mm & 15mm. I have only shown the flow line as the return line will just be a...
  13. E

    gravity fed upstairs shower pressure question

    We have a gravity fed hot water system in our the house we have just recently moved into. It works fine with the downstairs shower, however we are about to upgrade the upstairs bathroom and are considering installing a shower bath. My concern is that although there is more than sufficient...
  14. B

    Mess left by Ideal Heating Gas Engineer

    I was sent an engineer by Ideal Heating to fix a problem with my system. When he left he drove over a pot of sealing compound (which must have dropped out of his van) on my shared drive. My neighbour pointed it out to me since he was parked in her space. I tried to remove it with water and...
  15. J

    Old un-pressurised heating system - top up valve

    Hi All, I hope you are doing well. I have old un-pressurised heating system and I need to top up the water but I cannot locate the bloody valve. Where is it? Is it in the attic? I also have this valve with black screw on top. Should this be opened or closed? Thank you
  16. S

    Drayton Digistat 2RF - Heating & Hot Water not working

    Heating and hot water is not working. Plenty of heating oil. I have replaced batteries in thermostat and it seems to be working ok, showing flame to call for heat, and the receiver seems to be working ok with green light, but heating is just not firing. I really am not sure what the problem is...
  17. Johnny1973

    Weird, nonsensical radiator problem. Out of ideas...

    Hoping somebody can help, So, in a nutshell… Standard 90s Westbury home – condensing boiler, pump, wall thermostat, etc etc... Normal, common or garden, run-of-the-mill British housing estate CH setup. Downstairs radiator, 1 of 2 in our living room, went cold one evening mid-November last...
  18. K

    Main 24HE constantly cutting out and firing back up on HW and Heating and intermittent flame failure light.

    I am having a problem with my main 24he boiler where the flame is constantly clicking on and off with the heating and when using hot water. Some times the flame failure light comes on but it ignites again after a few seconds. The plumber has changed a couple of sensors on the boiler and checked...
  19. M

    Radiator Not Heating Up

    Hi, Sorry if question already answered in previous posts, but I can't find a solution to the below: We recently moved house to a new home that has previously been extended. In one of the bedrooms that has been extended there are 2 radiators, one which looks like it was fitted when the...
  20. ericmark

    Google Nest Central heating control how to improve?

    I have a home with an oil boiler in a garage turned into a flat, heating both flat and main house, running c plan with two pumps, two motorised valves simple bi-metal thermostat on wall in flat with 4 standard TRV's rarely used so not worried about the flat, and main house has Nest Gen 3 in the...
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