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  1. B

    Main heat exchanger overheating when heating off

    Hi All, Have a peculiar problem with my Gloworm Flexicom 30cx combi boiler, the main heat exchanger is getting red hot and fault coding on overheat even though the boiler and central heating is not on, i shut the boiler down for a while, clear the fault code and it will be fine again for...
  2. A

    Baxi boiler - heat exchanger

    I have a Baxi Duo Tech 28 HE. According to an online search with the serial number and GC number, I should have a 20-plate heat exchanger. So, I purchased a 20-plate unit. However, when I removed the old part, it appears to have 12-14 plates. Is there any harm in installing a 20-plate exchanger...
    • acerf1
    • Thread
    • baxi boiler heat
    • Replies: 1
    • Forum: Boilers
  3. I

    Heat pump cylinder in outhouse in Scotland

    My landlord's great at getting all the Scottish government funding that's going, and there's full insulation, double glazing, an airsource heat pump and a Mitsubishi Ecodan unit. The Mitsubishi installation manual says in big letters "The cylinder unit MUST be located indoors and in a frost free...
  4. Z

    How quickly does LLH create heat

    Hi We have had a LLH installed after major issues of UFH robbing heat from CH. now installed want to ensue working as expected. All 3 systems (CH,UFH,Hot water) work when on together now, which is progress, however despite the boiler flow to LLH being roasting it takes a fair amount of time for...
  5. IMRS250

    Anyone work for Octopus? Airsource heat pump upskill role

    Hi all, I have recently returned to the industry and have applied to Octopus for the upskill role into air-source heat space installs. Does anyone work for them on here? Just wondered what people's thoughts were on them as a company and if anyone is fitting air source what they think of this...
  6. dilligaf

    Heat storage tank only?

    Is it okay to use the boiler to heat the storage tank only whilst the central heating radiators are drained on with a conventional system?
  7. M

    Heat pump unvented install balanced cold

    If changing a combi boiler system to a heat pump. What do they usually do with the balanced cold connection on the hot water cylinder? Cap it. And put a pressure reducer on the mains so they have equal hot and cold pressures? I can't see them repiping a balanced cold from the cylinder to each...
  8. M

    Help needed on Ideal Logic Heat 15 System Boiler showing F3 error code

    Ideal Logic Heat 15 System Boiler Hi. Just started to get an F3 Fan Fault on this boiler. On power up there seems to be a quiet thump from somewhere then it goes through the start up sequence. It spends a few seconds on the ‘c’ display before coming up with the F3 error code. Can anyone advise...
    • malley
    • Thread
    • boiler heat ideal ideal logic logic system
    • Replies: 1
    • Forum: Boilers
  9. Z

    Unvented cylinder with heat only boiler??

    I'd like to install an unvented cylinder in the loft. With limited headroom it would have to be horizontal. I want to keep my existing valiant condensing boiler. I currently have a vented set up. A couple of plumbers said this could work. Will the feed and expansion tank for the central...
    • zaceverett
    • Thread
    • boiler cylinder heat unvented unvented cylinder
    • Replies: 10
    • Forum: Boilers
  10. B

    Just fitted K3 radaitor and the centre front panel won’t heat up

    I have started fitting new radiators in my house. The lounge kitchen gets very cold in the winter and is a big room that has previously had an extension put on it and is 19.5 metres by 6.5 metres with a 2.25metre high ceiling. I started by replacing an old radaitor with a 1200x 600mm K2. Which...
  11. L

    UFH + heat pump - is it connected correctly?

    Hi, we had UFH installed dowstairs in our house recently, and I'm not 100% sure that it's connected correctly. I'd be grateful if someone could have a look at the diagrams and tell me if what the plumber did makes sense. The house is heated with an A2W Samsung/Joule heatpump. The buffer...
  12. M

    Heat Only Boiler + S Plan+ + Weather Compensation Query

    Hi looking for some advice here if anyone would be so kind. Our existing system consists of an Ideal Logic Heat H15 heat only boiler paired to a 180L Kingspan Tribune XE Unvented Indirect Hot Water Cylinder (this is the Dual Stat version). Zone 1 (Downstairs) consists of 7 Radiators + Plumbed...
  13. J

    Pipe size for heat pump system

    I am sizing the central heating pipes for a complete replacement. The property has an elongated floor plan so I have used a piping layout consisting of single flow and return headers running the length of the property and take-offs to and from radiators. Currently there is a combi boiler...
  14. P

    Air-to-Air or only Air-to-Water Heat Pump?

    In my new high efficiency house, I will have UFH with an Air to Water (A2W). Heat pump Monobloc, but for extra cooling on hot days I think extra air cooling with FCUs is needed: Should I use a secondary Air (to coolant) to Air system, or stick with just the Air to Water system to also drive my...
  15. W

    do i require heat leak radiator

    connecting free standing woodburning stove to indirect cylinder, by gravity, do i need to fit heat leak radiator?
  16. M

    Heat loss calcs app?? Boiler sizing?

    Hi guys. Do many of you use a program to size boilers/rads or do you even bother with heat loss calculations? It’s a bit of a long winded process doing it long hand especially when a customer wants a quick quote. I’m not a fan of just replacing like for like if I’m honest.
  17. M

    How to prevent heat loss from a hydronic storage tank?

    I have a hydronic hot water storage tank located at floor level. The hot water flow and return pipes run up the wall into the ceiling space and then back down to floor level to the manifold. We are experiencing significant heat loss from the storage tank when the system is not circulating...
  18. R

    How do I stop Air being sucked into pump of Vaillant heat only boiler?

    Vaillant ecoTEC Plus 400 15kW Heat Only Boiler I've got air in the pump and one gas engineer has said I need to move the pipes as they are configured incorrectly. Another said all I need to do is add an AAV as high as possible. Another said I should seal the system. Boiler was installed in...
    • raidac
    • Thread
    • boiler heat pump vaillant
    • Replies: 9
    • Forum: Boilers
  19. A

    Plumb center heat demand icon not displaying (but heat comes on ok)

    Hi, my plumb center wireless room thermostat has stopped displaying heat demand icon when heat is on. I have changed batteries and completed a re-bind but no luck. I can still turn the heat on ok with thermostat, it's just that the display doesn't tell me I have done so! Any help would be...
  20. Scott_D

    CP12s operating pressure / heat input??

    When doing a gas safety check / certificate you are asked to check heat input or operating pressure. I have been told that you can’t record the operating pressure on a boiler with a zero guvnor it has to be a gas rate and calculate heat input. Do you agree?
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