combi

  1. R

    boiler timer

    we have a combi boiler with a timer that is always on. we then use a wireless thermostat around the house to control when the boiler fires up. if we don't want the heating on, we simply drop the temperature on the thermostat to a point lower than the current room temperature, which ensures the...
  2. S

    Can I turn down the central heating temperature on combi boiler if I have TRVs?

    Hi, I've got a combi boiler. I was thinking of turning down the temperature of the heating on the boiler (i.e. on the boiler itself not the temperature on the thermostat). Reading up on this it sounds like setting this as low as possible is the best option in terms of reducing gas usage - to try...
  3. S

    Do I need the pipes replacing? Or just a clean?

    It’s not my house but my friend is doing some renovation, she mentioned it to me but she doesn’t know if to get someone out or not to look at it? It’s not owned by her but her landlord doesn’t have time to check and tell her but the she thinks they may be getting too hot and that’s why there’s...
  4. Jack Bycroft

    Hive dual to single channel receiver wiring

    Hi, long story short my hive has been wired using a dual channel receiver on a viessmann combo boiler. Since removing the hub as I’m moving home, it only fires the boiler when I boost the hot water on the thermostat. Spoke to hive who said I should us the single channel receiver for the new...
  5. T

    Combi or not?

    Hi Can people please offer some advice on the following choice? We are in the process of fixing our old central heating system which is open vented and has almost no hot water pressure upstairs (cylinder and boiler downstairs). Our plumber suggests sealing the system and installing a mega flow...
  6. TeachMeObiWan

    Can I preheat the feed to my combi boiler?

    Hi, Only my 2nd post, but you were all so helpful with the first post I thought I'd have another go. I was talking previously about how I have a fairly new combi boiler (Vaillant Ecotec Plus 832) and also some solar PV and had the notion of fitting a HW cylinder as well. Since then, I've seen...
  7. C

    Combi boiler fed by pump from tank

    Hi TL;DR - I want to get a combi boiler to save space but want to increase the pressure of my water by pumping water from my tank through the combi I currently have a 2bar shower pump pumping cold from my tank and hot from my cylinder to my shower. Now we're getting the house renovated, and one...
  8. Z

    Underfloor heating pump wiring

    Hello everyone, i have installed underfloor heating, and cant figure out how to wire manifold pump so that it only turns on with the heating on and not with hot tap water it is a ideal logic + combi 30 boiler. Anyone know if its even possible?
  9. I

    Dual Hive Using For Combi

    Hello, I'm using a Dual Hive for Combi (I'm using this and not single because it got it soooo cheap ). I have researched as much as i can, before asking. Have I set this up correctly ? Hive = Boiler Earth = Earth N =Blue L = 230v Live Out 4: Heating On (NO) = 1 References used ...
  10. J

    Combi system losing pressure

    Has anyone known a Grant 26 combi (external) to leak internally into the flame chamber? For the approx four weeks, every morning the boiler has lost all it's pressure. I refill the system to 1.2 bar, and it kicks back in, and works fine - rads toasty warm and hot water is hot! This may last two...
  11. F

    Which operating mode for Viessmann 100-W?

    I'm about to get a Viessmann 100-W B1KF and plan to have it hooked up to a Tado smart thermostat system. I'm assuming that as the Tado supports OpenTherm, to get that benefit, I should ask the installers to make sure it is in the operation mode highlighted below (from the 4 available)? I've...
  12. F

    Combi boiler with 2 showers at once - enough power?

    I am currently using a system boiler (Ideal Mexico Super 2) and water tank, which is about 30 years old. I'm looking to replace this with a Viessmann 100-W (B1KF) 32Kw combi. I was wondering would I be likely to see a significant difference if 2 showers run at once? I'd like to avoid needing to...
  13. N

    Viessmann vitodens 050-W valves

    Hello, I stupidly was fiddling with the isolation valves in my viessmann vitodens 050-W boiler and forgot which direction they go in, I have all valves open currently, the hot and cold water, flow in and flow out valves also. Is this correct?
  14. S

    Heatslave 15/19 oil boiler - intermittent lockout issue

    Hello I am hoping someone can help. We are having issues with our boiler. When we are just using the boiler for hot water there are no lockout issues at all. However, when the heating is in use it the boiler will lockout around 30-60 minutes after the heating has come on (it can sometimes...
  15. M

    Scorching water from Vaillant combo

    Hi… I have an old Vaillant Ecomax 824/2e that is making some very hot water! The water temp gauge is set to 50 degrees Celsius (on the lcd display on the boiler - the dial is about half way between coldest and hottest). However, when I turn on the top tap fully, the reading on the same gauge...
  16. J

    Replacement boiler - keep traditional or change to combi?

    Hi Our 30-odd year old Potterton Netaheat boiler has stopped working (fan works but it's not firing). I've decided not to bother throwing good money after bad and paying someone to come and look at it having cancelled British Gas Homecare some years ago. I've done some research and it seems...
  17. B

    Temperamental Biasi - bin it or persevere?

    Moved into my house December 2019 with a Biasi Riva Advance HE installed over 10 years ago (found out from their service line it's not under warranty). Had a couple of intermittent faults with it over the past 18 months but for the most part its been ok. New problem started this week - hot...
  18. B

    New combi boiler - am I being bullied and ripped off?

    Hi all, I currently have a 13 year old Worcester Bosch Greenstar 28i Junior Condensing Boiler installed. It's unfortunately developed a leak on the right hand side as you face it, but it's not losing any pressure and we've still got heating and hot water. I went on Checkatrade and found a...
  19. R

    Replacing old thermostat with Hive.

    Sorry, I really have spent about an hour looking online for the answer and just can't find anything. Boiler = Worcester Greenstar 28i (dial/timer in the middle) Old thermostat = Siemens Landis & Staefa RA02 New Thermostat = Hive single chanel active heating. The old thermostat is in another...
  20. G

    Boiler Flue Tip / Exhaust Vent

    Hello all, We have the boiler serviced every year under a cover plan that we've had. Boiler is great, about 15 years old and we've lived here 4.5 years and it's not let us down at all. Every year they come to service it, every year it passes, although the person servicing it seems to insist...
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