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Heating and cooling: Hot Water Expansion Cylinders

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    Can you advise where this gets plumbed in? Is it on the hot water side or central heating side?

    Is there a preferred position? I know the one end goes to the tundish for discharge
    • CommentAuthortony
    • CommentTimeMar 2nd 2015
     
    Can't see it
  3.  
    It's a red cylinder, with two outlets and a pressure gauge
  4.  
    If the DHW system is open vented i.e.fed from a cold water tank in the loft which is itself open to the atmosphere then you don't need an expansion tank on the DHW side of the tank. (the CH should have its own expansion tank, either open or closed depending on the system) If the DHW is mains pressure than an expansion tank is needed. This will be a pressure vessel (as you indicate by it having a pressure gauge) This can go anywhere on the DHW system PROVIDING there is no valve or isolating stop cock between the expansion tank and the DHW tank, however it is usual and IMO better to put it immediately before the cold feed entry to the DHW tank, this way it it does not get hot water into it so no heat loss and does not need insulating. The connections are 1 connection to the cold feed (and therefore the DHW tank) which should be after any cold feed shut off stop cock, the other connection would be to a pressure relief safety valve the output of which goes to the tun dish. If it is more convenient you can take the pressure relief valve as a tee off from the pipe between the DHW and the expansion tank and block off the 2nd outlet on the expansion tank. I must stress that there must be no way that the expansion tank and pressure relief valve can be isolated from the DHW tank!!
    The expansion tank should be a membrane type, such tanks that you get here come pre pressured and there is a car type valve on the tank so that the pressure can be adjusted to suit the local conditions.
    If you can put up a diagram of your proposal we can comment upon it.
    • CommentAuthorCWatters
    • CommentTimeMar 2nd 2015 edited
     
    Posted By: VictorianecoCan you advise where this gets plumbed in? Is it on the hot water side or central heating side?


    It depends on what sort of system you have. You might need more than one or none.

    The most common place to find one is on a sealed/presurised heating system. Sometimes one is supplied inside the boiler.

    As I said it depends entirely on the design of the system. If you have a thermal store that might complicate things.

    Is there a preferred position? I know the one end goes to the tundish for discharge


    The pressure relief valve and tundish don't have to be connected to the expansion vessel. That might help with finding somewhere to put the expansion vessel if it's big.
  6.  
    Sorry, I thought I had attached a picture in the first post.

    It is the red one I need to plumb in, the white one I have plumbed to the side of the cold feed pressure valve as per the picture.

    I can't work out where the feed for the red one is taken from, obviously the discharge off it goes to the tundish
      C360_2015-03-02-10-15-11-534_org.jpg
  7.  
    I think it goes on the heating circuit?
    • CommentAuthorDantenz
    • CommentTimeMar 2nd 2015
     
    It is connected into the central heating return pipe before any zone valves and the heat generating appliance.

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