Oil Combi Boiler - What size should I get?

Discussion in 'Plumbing and Central Heating' started by steveharman, 11 Aug 2009.

  1. steveharman

    steveharman

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    I appreciate there may not be a precise answer to this, but so I have an idea before I speak with various heating engineers;

    We have 7 rads in a 3 bed cottage - the building is double glazed & Celotex'd throughout. Also one bathroom and a kitchen sink. All the rads are cast iron but none of them are huge (say 3ft by 4ft each).

    We're going the combi route and are considering a Worcester Bosch Greenstar Heatslave 18/25, which I gather has a minimum output of 18KW and maximum of 25. Does the panel think this model would be sufficient? ;) It seems to be in the middle of Worcester's oil (combi) condensing range.

    http://www.worcester-bosch.co.uk/homeowner/products/oil-boilers/greenstar-heatslave-1825

    Thanks in advance,

    Steve
     
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  3. Terrywookfit

    Terrywookfit

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    You must really hate the poor ba$$t@rd who will have to repair it!

    Be nice to him and fit a Grant.
     
  4. steveharman

    steveharman

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    Rrrrrright. OK. Ummm, could you suggest a Grant model that will be sufficient for the cottage / number of rads as described?

    Thanks.
     
  5. wilhelm

    wilhelm

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    try this

    and as the fookwit says, do us all a flavour and dont get a berty wooster. lifes too short.
     
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  7. KevC1

    KevC1

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    I'd go for a Grant vortex combi 21kw. It'll be around £1800 to buy. Good boilers, easy to fit, easy to work on, reliable.
     
  8. izzy eckerslike

    izzy eckerslike

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    Is an oil fired combi the way to go if you presumably don't have gas
    Are they not rather slower at providing hot water on demand compared to gas/LPG?
     
  9. simond

    simond

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    Not really because they use a buffer store.

    They are more like a Worcester 440/550 gas/LPG in terms of design building blocks and performance.
     
  10. Boilerman2

    Boilerman2

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    You should size your Combi on the basis of Hot Water production, check your property's Standing & Working Water pressure and Importantly Flow rate, theres no point in forking out on a Grant VTX36 if you only have a flow rate of 11 litres/min, at that rate a VTX26 would be more than adequate, Central Heating load is very unlikely to be greater than the Hot Water load ;)
     
  11. DIYnot Local

    DIYnot Local

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