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Opinions on system specs and twin coil cylinders

Discussion in 'Plumbing and Central Heating' started by stevebamford, 21 May 2008.

  1. stevebamford

    stevebamford

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    Hi all, OK so have finally got some decent quotes in .... two I am considering

    Quote 1
    Worcester Bosch boiler
    Santon dual coil cylinder
    Plastic under floor, copper above

    Quote 2
    Baxi Solo boiler
    Ariston dual coil cylinder
    All copper

    Both guys seem very good

    Firstly any comments on the system specs, especially what do people think about the cylinders ? I know nothing about this stuff bar what I've read online so any opinions from the professionals would be greatefully received

    The copper man was about £1500 more expensive but when I let him know I was going with plastic man he said he could almost match the price. Must admit am a bit concerned that he can drop the price that much ....

    ho hum ....
     
  2. BigBurner

    BigBurner

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    Go for the ACV tank-in-tank cylinder. It has a an additional coil. The CH can be taken off the cylinder which is a great advantage as TRVs can be on all rads. Read my posts on this thread here:

    http://www.diynot.com/forums/viewtopic.php?t=135553

    Spec up the system and tell them to price on it and don't be swayed by them. They will push you into what they think they can make most money on.

    BTW, avoid a Baxi.
     
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  4. sturharv

    sturharv

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    Make sure the cylinder is the correct capacity for the property.

    What capacities have they based their quotes on?
     
  5. stevebamford

    stevebamford

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    1 bath plus 2 ensuites, 4 people normally

    Quotes on
    Santon 250L
    Ariston dunno but guess it would be the 210L

    Actually we've specified the twin coil as we may want to use solar at a later date. Is it a good plan / possible to connect the two coils in series for now and run the boiler through both of them ? Would give effectively one big coil ?
     
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  7. BigBurner

    BigBurner

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    Best to get the ACV tank-in-tank I pointed to. Ideal for what you are doing with a spare coil. No need to connect it up to the boiler, as the boiler only heats the outer cylinder. The rapid reheat means a 200 litre will do what you need. As you are drawing off hot water the boiler is pouring it heat into the DHW from top down in the cylinder. Normal coils in cylinders do the opposite making them very inefficient in comparison.
     
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    DIYnot Local

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