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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. F

    Replacing an installed megaflow system with a combi-boiler when current boiler needs replacing

    Home owner looking for some advice pls. We have a megaflow system which we are considering removing as the tank takes up a lot of space and we don’t find we are using more than one shower or bath at a time. Our plan is to do this when the current boiler needs replacing (probably in the next...
  2. B

    External flu rusting - does that mean whole new boiler needed?

    Hello I’m hoping for some perceptive / input as I’m a long-distance landlord trying to unpick the best thing to do. Gas safety certificate was done on my rental flat (1st floor) which has a 10 year old Aviston E-combi EVO boiler. It failed based on rusting external flu components, which has...
  3. C

    Worcester Bosch Heatslave 26/32 (Oil boiler 2007) Flue perished

    Oily smell from boiler recently before failed. Great plumber sorted though when opened external baffle at front of sealed flue the internal spring like tube lining outer insulation had all perished. Barn conversion with thick walls (763mm). Worcester Bosch say Flue Kits are obsolete and...
  4. alanmcm

    Moving into a new home and boiler system is 17 years old

    My daughter bought her first home and was hoping to convert to gas but its not available in the area, so thinking a boiler upgrade is the better way to go. Just after some advice and rough costs involved, is it worth getting a pressurised system installed and a new boiler and oil pump? Heating...
  5. F

    Heat only new boiler recommendations?

    Hi All, Looking for a recommendation for a heat only boiler to replace my 30yrs old ideal boiler. Any makes you would recommend and any to avoid? Thanks
  6. B

    Vaillant Eco Boiler not working query

    Hi all I have a Vaillant eco boiler at a new house I moved into last week. It’s a combo boiler and the last boiler I had was old (and much easier to use!) This one keeps turning itself off. The hot water seems to work and is always warm. The heating also works but for random amounts of time...
  7. B

    New boiler - Inhibitor top up?

    During an install of new boiler ('old' boiler died after 11-12 years) the system was "drained" but I guess maybe 90% of water was left in the (rather large) underfloor pipe system. What is the best way to tell how much inhibitor should be added in this case? (also taking account that system was...
  8. Garroth

    GlowWorm Boiler Burner Never Switches Off

    Hi, whenever my Gloworm 18r is on even if I leave it on non-stop for 6 hours the flame symbol for the burner never switches off and the radiator icon never stops flashing implying the rads are calling for more heat, even though they're all red hot and have been for hours, is this a fault or just...
  9. Zig168

    Combi Boiler vs System Boiler

    I think the last discussion was back in 2021. A few questions to guide any discussion. Which are the cheapest to heat over the year, system or combi in an average 3/4 bed property? Which will be the more reliable and cheapest boiler type to repair over the next 10 years? Is there a better...
  10. Zig168

    Replacing a 22 Year Old Boiler any recommendations?

    I've got a non condensing Glowworm Ultimate with gravity tank and hot Water tank in a 4 bed house. 11 radiators 1 double 1400mm length 1 P+ 1400mm length 2 P+ 400mm length 7 singles 400mm 1 mains shower average water pressure Any recommendations on combi boiler and KW? Boiler budget...
  11. B

    New regular boiler (heat only) in a sealed system??

    Hi, I am replacing our 11 year old boiler (due to H.Ex. leak) with a new one. This is in a "sealed" system with red expansion vessel in airig cupboard & a megaflo (no tank in loft). However the exisiting boiler is Vaillant ecoTEC 4xx boiler - which is satated by vaillant as an "open vent" boiler...
  12. vertexape

    Would like to understand how my Grant Oil Combi boiler is hooked up to the pipes in the house

    Hello, bit of a noob question but would someone be able to help me to understand the pipes coming off our boiler. It's a Grant oil combi boiler, and where the pipes come in is in a room at the front of the house. I am about to box them in but I really wanted to understand what the various pipes...
  13. T

    Recent boiler room upgrade

    For those interested, here’s a recent install.
  14. L

    Worcester Bosch Heatslave Boiler pressure issue... any thoughts...?

    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...
  15. 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...
  16. 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!)...
  17. 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...
  18. 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...
  19. W

    Worcester Boiler on the Blink... Literally! All Lights Flashing

    My Worcester Combi Boiler is not working, instead the display flashes on and off repeatedly, as shown in <a href=" View: https://youtu.be/Touvx2c3RJE ">this video</a> I took when turning it back on this morning (it had been off overnight) - it shows the behaviour, but if that fails, all the...
  20. 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...
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