1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

Viessmann Boiler questions

Discussion in 'Plumbing and Central Heating' started by rajan2004, 26 Aug 2016.

  1. rajan2004

    rajan2004

    Joined:
    11 May 2012
    Messages:
    8
    Thanks Received:
    0
    Location:
    London
    Country:
    United Kingdom
    Hi all,

    Our 15 year old boiler has finally given up the ghost and so we're getting quotes for a new Combi boiler to take its place.

    We've just had a visit from an engineer who is an accredited Viessman installer. He said they're great boilers which have a 10 year warranty. I hadn't heard of them before so I wondered what everyone thinks of them? Would you say a Vitodens 100 35kwh is better than a Worcester Bosch 42cdi (the other one we've been offered)?

    The 2nd thing is that the aforementioned engineer has also said that we don't need to power flush our system before installing a new boiler. He said it isn't required for the Viessman warranty and we would just be wasting our money - he also said we don't really need a magnaclean either. He has included a flush of our system using mains water in his quote.

    We're still planning to get a couple more quotes but I'm really confused. What is the best brand and should we powerflush and get the magna clean installed?

    The Viessmann engineer has great feedback on checkatrade (almost 10 out of 10 from over 140 reviews) and I was impressed with him but I'm very wary about his view on the power flush and magna clean issues
     
  2. HootingOwl

    HootingOwl

    Joined:
    19 Jun 2008
    Messages:
    4,243
    Thanks Received:
    1,334
    Location:
    Bristol
    Country:
    United Kingdom
    I would take the viessmann over the worcsster. And i would fit a magnaclean. Powerflush depends on how filthy the existing system is and may not be needed.
     
  3. AGAS

    AGAS

    Joined:
    21 Feb 2014
    Messages:
    9,668
    Thanks Received:
    1,699
    Location:
    down south
    Country:
    United Kingdom
    don't believe everything you read , depends where the feedback comes from and for what jobs .
     
  4. muggles

    muggles

    Joined:
    28 Oct 2005
    Messages:
    10,964
    Thanks Received:
    2,144
    Location:
    Oxfordshire
    Country:
    United Kingdom
    There are many makes out there that are better than WB, Viessmann being one of them, although if you can stretch to it the Vitodens 200-W is the one to go for, as it's going to be much more efficient in use if it's been installed correctly. All systems need to be flushed before any new boiler is installed - if a component fails and the water is found to be dirty, the warranty will be invalidated

    If you can't stretch to buying a Vitodens 200, then go for an Intergas ECO RF 36. 10 year warranty no matter who installs it, upgradeable to 15 years for an extra £300, and also an excellent boiler.
     
  5. Agile

    Agile

    Joined:
    26 Jun 2004
    Messages:
    63,560
    Thanks Received:
    4,511
    Location:
    London
    Country:
    United Kingdom
    Unfortunately Power Flushing is just one way of cleaning a system.

    Most only need chemical cleaning and flushing out with mains water pressure.

    Its not really the name on what is being done but exactly how its being done and what chemicals are being used.

    Some installers just turn on a power flushing pump while they are installing a boiler and call that a power flush.

    Usually the only time a power flush is likely to be needed is when the previous boiler failed as a result of sludge.

    Tony
     
  6. DP

    DP

    Joined:
    10 Dec 2003
    Messages:
    12,080
    Thanks Received:
    2,297
    Location:
    Glasgow
    Country:
    United Kingdom
    Or the radiators are sludged up and stay cold in the middle(y)
    Some boilers will keep chugging away despite this:)
     
    • Like Like x 1
  7. DP

    DP

    Joined:
    10 Dec 2003
    Messages:
    12,080
    Thanks Received:
    2,297
    Location:
    Glasgow
    Country:
    United Kingdom
    Rajan, what boiler and model do you have at present?
    And what us wrong with it. Often an installer might choose to sell you a new boiler if he/ she is not hands on with repairs. I look after boiler some of them 30 years old and still going strong

    As Muggles says, water quality needs to be good else you could have problems. Look at a benchmark logbook. It requires an installer to enter details of cleaners used. If dirty water kills the new boiler, no matter what is installed, there could be subsequent quibbles following a dirt related failure
     
    Last edited: 27 Aug 2016
  8. Phill Peck

    Phill Peck

    Joined:
    17 Aug 2011
    Messages:
    14,924
    Thanks Received:
    3,563
    Location:
    Cambridgeshire
    Country:
    United Kingdom
    Your installer may be correct a powerflush may well not be necessary.
    A mains flush is often sufficient, although I would always at least run a little chemical through and hot/cold and mains flush.
    Install a spirotech mb3 filter.
    Viessmann have been good with their warranty, especially with regards to dirty systems. This is still no reason not to have a clean system.
    Afaik the 100 still has 5 years warranty as standard which can be upgraded to 10 for around £200.
    This may have changed though as the 050 range now has 7 years.
     
  9. Jackrae

    Jackrae

    Joined:
    20 Nov 2012
    Messages:
    1,982
    Thanks Received:
    322
    Location:
    Dumfriesshire
    Country:
    United Kingdom
    +1 for the 200 with weather compensation
     
  10. AGAS

    AGAS

    Joined:
    21 Feb 2014
    Messages:
    9,668
    Thanks Received:
    1,699
    Location:
    down south
    Country:
    United Kingdom
    i can just remember when they first come out ( can't remember how long )and had no end of problems and the manual looked like it was written by a ten year old , i haven't even seen one since so i hope they have changed and by the sounds of it they have ( i hope ??????? )
     
  11. muggles

    muggles

    Joined:
    28 Oct 2005
    Messages:
    10,964
    Thanks Received:
    2,144
    Location:
    Oxfordshire
    Country:
    United Kingdom
    The new 200 looks quite shiny...I'm tempted to start offering them as a premium option for people who aren't looking to spend as little as possible. 19:1 modulation (yes, 19:1 - a 35kW will go down to 1.8kW) makes them ideal for flats and apartments with very low heating requirements. I've got no issue with the current manual
     
    • Thanks Thanks x 1
  12. dreadnoughtheating

    dreadnoughtheating

    Joined:
    31 May 2009
    Messages:
    3,356
    Thanks Received:
    648
    Location:
    Norfolk
    Country:
    United Kingdom
    8 out of 10 boilers I fit are Viessmann..... 1 in 100 are worcester.

    I always offer a choice of minimum two different manufacturers, (I suspect the price difference and the longer warranty period between say, the viessmann and the worcester, swings it for the viessmann)

    Get a magnetic filter and branded e.g. Fernox/Sentinel corrosion inhibitor into the system once cleaned.
     
  13. Phill Peck

    Phill Peck

    Joined:
    17 Aug 2011
    Messages:
    14,924
    Thanks Received:
    3,563
    Location:
    Cambridgeshire
    Country:
    United Kingdom
    The manuals on the early models I think we're literally word for word translated from German.
     
  14. oilboffin

    oilboffin

    Joined:
    26 Apr 2011
    Messages:
    1,645
    Thanks Received:
    241
    Location:
    isle of Lewis
    Country:
    United Kingdom
    You really do need a flush to stop the heat exchanger getting blocked
     
    • Like Like x 1
  15. ianmcd

    ianmcd

    Joined:
    15 Aug 2010
    Messages:
    12,531
    Thanks Received:
    3,709
    Location:
    Lanarkshire
    Country:
    United Kingdom
    +1 the Viessman are good boilers but they dont handle contaminated water well at all, put them on a clean system and you have a winner
     
  16. DIYnot Local

    DIYnot Local

    Joined:
    3 Sep 2019
    Country:
    United Kingdom

    If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

    Select the supplier or trade you require, enter your location to begin your search.


    Are you a trade or supplier? You can create your listing free at DIYnot Local

     
Loading...

Share This Page