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Central Heating Boiler | Boiler - Hot water boiling system​


A boiler is a closed vessel in which fluid (generally water) is heated. The fluid does not necessarily boil. The heated or vaporized fluid exits the boiler for use in various processes or heating applications, including water heating, central heating, boiler-based power generation, cooking, and sanitation.
Central Heating Boiler | Boiler - Hot water boiling system

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  1. G

    Oil boiler not heating up

    I have a danesmore 20/25 oil boiler and it is firing up but it’s producing no heat to the water or the radiators My next door neighbour an electrician has checked the cylinder and thermostat and they all check out ok so he thinks the problem is within the boiler Can Someone help give me some...
  2. W

    Boiler cuts out after repair

    Hi, looking for some advice. We have had an issue with our boiler of late and recently had a 3 port actuator replaced. What’s happening now is when we turn the water and heating on by the control panel the boiler cuts out after a couple of minutes. We opened the valve of the actuator and now...
  3. S

    Boiler overpressure with Potterton Precision

    Dear All New member here, coming looking for help. A few weeks ago I had work carried out by a British Gas Homecare service technician. It required a drain and refill of the system, and as he left, he advised my I would need to bleed all the radiators, at some point, given a few days, when...
  4. S

    Boiler output flow issues

    Morning all, I have a Worcester Bosch 8000 life 40kw boiler on system with 7 radiators and the boiler is located in the loft of a 1907 end of terrace house. It has been range rated down to 50% and I currently have the flow temperature set to 64, due to slow warm up. I recently purchased a...
  5. L

    Boiler inefficiency- cause and fix??

    Hi, moved into a home a year ago with what is probably an old heating system. There is a gas boiler linking to radiator central heating, and a water tank. Energy company charged an enormous amount for gas last winter (admittedly I hadn't taken regular meter readings so was unaware until a huge...
  6. H

    Overheat stat on Grant boiler

    Following on from my question about monitoring F & R temperatures, I needed a measuring device because the overheat stat. frequently trips and then needs to be reset. It normally happens when the boiler has switched off and is no doubt due to the hot water rising to the top of the boiler, but I...
  7. S

    Why does boiler run everyday for couple seconds at 0933am?

    W.B Greenstar 4000 installed. Heating not turned on yet as not cold enough here. But the boiler runs every day at 0933 (hear it fire and hear water in rads). Rad water runs for literally 3/4 seconds. Stops. Does it again a couple of seconds later. Then nothing until exactly at 0933 the next...
  8. B

    Boiler short cycling in system with hot water tank

    Issue with boiler short cycling in system with hot water tank. We have an ideal heating logic heat2 h15 boiler which feeds a hot water tank upstairs in the house. We have an issue where if the boiler isn’t set to 80c then the boiler will short cycle, the hot water tank thermostat is set at...
    • Boiler short cycling
    • Thread
    • boiler boiler fault central heating system
    • Replies: 10
    • Forum: Central Heating Forum
  9. S

    Replacing old regular boiler

    Hi I seek some advice on replacing an existing regular boiler. I currently have an old Potterton 10-16 Netaheat electronic, which is around 35 years old and still working OK. It is fitted to a std 'Y' plan system with boiler in utility room and separate hot water tank, pump, valve etc in...
  10. D

    UFH fed by heat pump in 120 year old red brick

    Hi, I have a 3 storey house built in 1904. We put UFH in the house about 20 years ago. Works well with newish gas boiler. Just curious... I know heat pumps are meant for tightly insulated modern house ... but.. Question: Given that my UFH is always at a low temperature - Could I feed UFH with...
  11. D

    Boiler Losing Pressure Issue

    Hi, Looking to see if anyone can give some advice please. My Baxi boiler has been losing pressure and I am having to top it up approx. every 4 hours from 0-1.5 bar each time. This has been going on a week now. I have also started to notice small drips running down my condensate pipe...
  12. P

    Boiler frost protection in the loft

    I would like some guidance regarding the Worcester CDi 29 Classic boiler. According to the manual it has a holiday mode and frost protection mode for when away for a period of time such as a holiday, both of which disables the central heating system and both require it to be set manually. I have...
  13. D

    Password to check the programming of a Grant Spira Wood Pellet Boiler?

    What is it? It apparently is obvious when one knows it. The last numbers of the serial number for example. Anyway, it hasn't been changed from the Grant factory set password,,, though it is numbers.
  14. M

    Banging boiler with embers?

    Hi, I turned my central heating on for the first time today this year and it started to bang and the flame inside looked a bit erratic. Upon looking in the pilot light viewer it looks like there is debris/embers burning resting on the bottom. I turned everything off and switched it back on to...
  15. N

    Vailant thermostat vrt350 not pairing with ecotec pro 28 boiler

    Hi everyone, I’m writing on behalf of my elderly neighbour and hoping this is a problem someone on this forum has experience of and remedied. The boiler was not responding to the wireless thermostat. The various settings on the thermostat seemed fine and 3 heating times and temperatures were...
  16. siricosm

    Boiler replacement in Norwich

    I need someone to replace my boiler, I am thinking to get an Intergas HRE 24 SB. Our current boiler (and old Ideal) is in the kitchen, and we would like to relocate it to the laundry room or loft, so a new gas line needs to be run. I would prefer someone local in Norwich that can also do the...
  17. H

    Zone Problems with Boiler

    I have an older gas boiler HW heating system with a taco circulator pump for each zone that worked fine last season. When turning it on for the 1st time this season I found a problem with the boiler not running on one of the zones. If I turn on the heat to zone 1 I hear the system...
  18. J

    System or Heat Only Boiler

    A (if) CH system has a very high head loss due to improperly sized pipework and long runs and possibly partially blocked pipes and requires a UPS2 pump running at its 8M head to feed 21 rads with a theoretical output of 25kw at a 20C dT. A fairly old Vaillant 438 boiler is being replaced, the...
  19. J

    Boiler or pipes STILL banging when CH is cooling down,any ideas?

    I posted in summer as HW system banged when cooing down it is now even worse once CH is cooing down but it's common between both systems any ideas folks, desperate now. Potterton combi boiler 10 yr old inherited 4 yr ago when I bought house, no issues until earlier this yr.
  20. S

    Can I override boiler ,thermostat broken

    I have a ideal logic 30 boiler ,the thermostat receiver looks to have died ( no lights on wired receiver ) I believe this need# replacing but in the mean time does anyone know if I can override the thermostat if heating is required please? the handheld thermostat is working it’s the boiler...
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