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Central Heating Boiler, Combi Boiler, Hot Water Boiler

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. P

    Cant get boiler Viessmann diverter valve out!

    I need to replace the diverter valve - I unscrewed it from the hydraulic block but for the life of me I can't get it out. I even spoke to Viessmann tech and they advised twisting and yanking hard but this tosser is not budging AT ALL. The valve was replaced 2 months ago by someone else. Is there...
  2. C

    Service old boiler vs buying new

    Hi everyone! Parents not used the boiler since 2013/2014, since installing a new wetroom for them they have now decided its worth getting the boiler running again. The only reason it has not been used i so long is the the zone valve kept getting stuck (would have fixed this myself if i knew!)...
  3. L

    Worcester Bosch Heatslave Boiler pressure issue...

    Greetings. I have an external Worcester Bosch Heatslave boiler and have a question about pressure. The boiler pressure was set to 1.5 during a recent visit by a plumber (as it seemed to have dropped and was hovering between the green and red zone) . A few days later I turned the thermostat down...
  4. P

    Glow worm back boiler

    Hi I have a Glow-worm back boiler which is giving me grief (I would have upgraded it by now but its a listed building and there's issues with venting through the external wall and I'm reluctant to go with an electric boiler instead (because of the consumption cost)). It's a sealed system. The...
  5. chloeradhsaw

    One Pipe System Ideal Mexico 2 Boiler

    Hello friends - I really struggle to understand my heating and hot water system I posted my question on Diynot but it ended up being five pages and couldnt get to the bottom of it and I thought worth asking the elders on here for their view - Hot water temp is 40 Degrees - Ideal Mexico 2...
  6. O

    Hortsmann Economy 7 Boiler Timer

    hello me and another student have just moved into a flat that has a Hortsmann Economy 7 Boiler. currently the timer is set to run for 7 hours with it turning on at midnight and switching off again at 7am. because there’s only two of us this is way more than we need and the amount of time the...
  7. S

    Baxi Ecoblue System Boiler Weeping from Drain Plug

    Hello everyone, Baxi Ecoblue System boiler which was recently serviced just before Christmas. There has since been a constant but slow drip coming from the black nylon plastic drain plug at the back of the boiler which is accessible from the underneath. It does not appear to be from the thread...
  8. cyberfruits

    URGENT Solid fuel back boiler decommission

    Hi We have a vented oil-fired heating system with a coal fire back boiler, this is going to be changed to a sealed pressurized system tomorrow and I believe, they are decommissioning the back boiler. I have only discovered today there is no access to the water jacket, so will it be good enough...
  9. TeddySam154

    Boiler has started leaking water urgent advice needed?

    Hi, I need some urgent advice. I've Just come home after going out for evening, to discover hallway floor and kitchen floor covered in water. On further inspection I discovered that water was coming from boiler cupboard. On looking in boiler cupboard I found boiler has started leaking water...
  10. B

    PLEASE HELP Hot Water Combi Boiler Advice

    PLUMBING ADVICE NEEDED Combi boiler in our house, downstairs water seems to be piping hot. Upstairs basin, bath and shower only ever seems to be lukewarm - so much so that no one even wants to bath as it never gets hot enough! Open to suggestions as to what it might be and if anyone can...
  11. C

    combi boiler frost protection

    Hi I am somewhat confused. My daughter has a combi boiler bought 2-3 years ago and has it timed to come on in morning for an hour and at night for a few hours using "auto"? mode I had been brought up to leave boilers on manual and set the thermostat low at night to prevent pipes from...
  12. Daviddickson

    Boiler Replacement in Glasgow - Discussing Options and Recommendations

    Best boiler replacement in Glasgow. At Xpress Boiler Solutions, we provide the best & most eco-friendly, affordable boiler options in Glasgow
  13. Clottie

    BS759 is water quality testing legally mandatory for landlords

    i am a landlord and have had great advice here. I am using a new gas engineer/plumber who tells me Water Quality testing is now a compulsory part of a Service to a Gas Boiler. i cant find a definitive answer... is it advisory or mandatory and if the latter, which Gas Regulation does it come...
  14. M

    Are repairs on a recently serviced boiler free?

    My boiler was serviced a month ago and now it's leaking. Is it normal for the plumber to repair the leak for free seeing as it was so recently serviced?
  15. A

    Worcester Greenstar Ri Boiler Knocking

    Hi there, My boiler (Worcester Greenstar Ri) has started making a soft knocking noise when it turns on, and again a few times when it turns off. I've attached a short video of the sound. It isn't constant, it seems to happen within the first 10 mins of the boiler starting up, then you won't...
  16. T

    Vaillant eco plus 837 System loosing pressure.

    I have a Vaillant eco plus 837, year installed 2008. It works well. We have one large zone for the house with 13 rads running off it. We also have an UFH zone in the kitchen. Near the boiler I have 2 port valves which control this part of the system. The boiler has been loosing pressure...
  17. M

    Baxi boiler pressure drops after heating

    Hi, we have a back combi heater. Whenever the heating comes on it seems to lose pressure within a few hours and I have to refill each morning. The boiler seems to function well, and the pressure only drops with the heating and not the water being on. Ie it started last winter and was then...
  18. W

    New boiler but extension still not hot

    Hello, We had an extension built seven years ago. Initially the builders' plumber connected the heating to the house system but this didn't work. The builder got him out again and he created a separate heating circuit from the boiler (ie one circuit for the house, the other for the extension)...
  19. V

    Gas Boiler service Cost

    Hi All, what's the cost of a service for an unvented system ? (valiant boiler & mega flow cylinder). I was charged £320.00, for the following: Boiler service - no parts changed. Change wireless thermostat (honeywell to Tado), I supplied the thermostat starter kit. is that about correct ? Also...
  20. C

    AAV closed in Vaillant boiler for many weeks - how risky?

    I got my regular annual boiler service for my Vaillant ecoTek 930 about a month ago, and the engineer identified that the AAV was leaking, so he closed it. This is a tenanted property and it's not straightforward to get access to it. How risky is it to / how long can I leave the AAV closed...

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