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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.

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  1. Desktop987456

    System Boiler reviews

    Hello, I am looking at Zanussi Ultra System 18kw. Does anybody has any experience with this brand. I have heard about thier other appliances like hobs and dishwasher but not much on boiler. https://www.freeboilermanuals.com/assets/pdf/Zanussi/zanussi-system.compressed.pdf A brand new unit is...
  2. Jock Spanners

    Two houses but only one boiler?

    Evening All, I have a customer who wants a modern oil boiler fitting to replace his ancient one. The big problem is he's divided his house into two with a holiday cottage next door. I'm not sure but surely that's against Building Regs and he needs two boilers?. Can anyone advise me? Thanks, Jock
  3. Z

    Low gas pressure during boiler full load test

    Hi, I am a homeowner but caught between a rock & a hard place. I am trying to get a Vaillant ecoTEC 630 plus serviced but the gas safe engineer & Vaillant engineer say one thing, whilst the SGN engineer says another. I do not know how to proceed and would value some informed advice. The rock...
  4. A

    System boiler with vented system (bodged new install, what next)

    Previously had a WB Greenstar R28 HE System boiler with 4 pipes and vented (gravity fed) cylinder. No valves or pumps outside of the boiler. Worked fine for 20 years. Decided to change to Viessmann 050-W System boiler when WB failed but keep the same set up with cylinder. Gas Safe installer I...
  5. I

    Combi boiler question regarding usage with no pressure

    Hi, just a quick question. Do I need to fill my combi boiler to run it for hot tap water only? I'm planning to drain the system and leave it drained a while so I can decorate and change some pipes and rads.
  6. C

    Smell like paint or shoe polish around boiler

    I’m at a loss with this one. We renovated a run down house and have lived in it now for about 16 months. We had a new Greenstar 8000 Style 35 installed. Just before Christmas - about 12 months after install - we came home to a funny smell like paint, shoe polish etc - a very chemical smell...
  7. M

    Radiators Permantly on

    Hi Guys I could do with some help here. I have tried search but no found an answer. We have just had a new boiler fitted which is a Vailliant Eco TEC Sustain, along with a Neomitis Thermostat. The tempreture on the theremostate is set to 20C the thermostat is dsiplaying the room tempreture as...
  8. O

    Is my Navien boiler behaving as expected?

    Hi Can you help me determine if my new Navien lcb700 lsx is working as expected? I got the Navien oil boiler installed to replaced an old firebird boiler. The new boiler is a condensing oil boiler and I’m not sure if this is working as expected. I’ve a 300 L water cylinder and after one hour...
  9. J

    Combi boiler obsolete part dilemma

    Hi everyone, I have been searching the Web for a spare part for a Worcester 35 cdi ng boiler that is obsolete. I can't find one anywhere and its looking more and more likely I'm doomed . The part is the door extrusion seal 87161031280. I have sold my house STC and this has just happened , so...
  10. chloeradhsaw

    Gurgling Noise From Rad When System Drained F&E Empty And Boiler Off

    My heat only gas boiler is drained from the boiler drain valve - There is no water in the F&E tank. The hot water vented cylinder is removed. So far so good Twice this evening I heard radiator gurgling noises which frightened the life out of me I cant seem to reproduce the noise and I cant get...
  11. W

    Firebird oil boiler hot water

    My firebird oil boiler hw supply is luke warm, but does heat up slightly when run if the ch is on at the same time. Is this a faulty diverter valve? If so could I replace this myself as I've heard they're expensive to fix. Tia
  12. R

    What paperwork should a boiler installation come with?

    Hi gents and ladies, Making the probable mistake of buying a house at present : bit of a fixer with a shoddy but recent boiler installation. Have a bit of a question for our resident gas people, if you can possibly help me out here. The vendors seem to have lost the installation invoice, but...
  13. T

    Leaking pipes from boiler

    Hey - hope you're well, These two pipes on my boiler have started leaking - not tons of water, but regularly and enough to be an issue. The insulation around both have become holed / broken, presumably from said water. You can see a photo here: Screenshot 2023-04-24 at 06.42.32.png -...
  14. R

    Thermostat and Programmer not communicating with Boiler

    Thermostat and Programmer not communicating with Boiler. Both have been replaced. Any ideas? On the Glowworm boiler 18sxi I can use the CH controller to switch on/off the boiler, that works fine. Also upstairs i have a tank, when I switch that on I get hot water. But what else can I check...
  15. T

    Boiler replacement advice

    Hi i hope i can explain my situation so that you can understand, i'm not a plumber but need advice. I have a 25 year old gravity feed wall mounted boiler that runs perfectly as we have a log burner we only really use it for hot water. The boiler is mounted on an internal wall with the flue...
  16. Chris2023

    Will water run through a switched off boiler.

    Long story short I have a leak from possibly the flexi hose that connects to the upstairs hot water tap. I've switched off the boiler and mains water and waiting on a plumber but not sure when they'll arrive. My question is if I leave the boiler off and then turn the water back on so I can use...
  17. S

    URGENT How to shut off hot water and heating on this kind of boiler and tank?

    How to shut off hot water and heating on this kind of boiler and tank?
  18. L

    HMO Refurbish with 5 bathrooms

    Hi I am new to this forum so forgive me if I add this to the wrong place. I have purchased a 2 storeys property which will be converted to an HMO of 6 Bedrooms and 5 bathrooms(3 on the ground floor and 2 on the first floor). The property is derelict now so we will need to rip everything out...
  19. luckyvictor

    Boiler keeps on boiling water even heating is switched off

    The problem is, my ideal boiler logic heat h15 keeps on burning (igniting flame icon on) all the time, all day long, regardless of the programmed on off schedule for both heating and hot water. when we have the heating turned off from the thermostat programmer (danfoss tp9000ma-si), i.e frosted...
  20. W

    Combi boiler - bang when hot water opened

    Hi All! I hope you can give me some advise. I had combi boiler (Viessman vitodens 100-w 30kW) installed about half year ago. Recently I start hearing one single bang when hot water is opened at any of taps around house. It sound like someone in other room will knock a radiator (not relly loud...
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