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  1.  
    Hi
    I have a number of 22mm and 15mm pipes carrying hot water for the central heating system and for the hot taps tight against an single brick outside wall right next to the boiler. I would like to insulate the pipes to keep the heat in, but I am not sure of the best approach.

    I can probably remove the plaster skim behind the pipes as it is probably not in good order which will give me a few mm. Would using expanding foam be the best option? I thought Areogel between the pipes and the wall may work as it would only need a strip 25cm by 2 meters but I still think the cost would take more to recover in savings to make it worthwhile. Also is Areogel OK being in direct contact to hot water pipes?

    Any ideas gratefully accepted.

    Dave
    • CommentAuthorbarney
    • CommentTimeFeb 18th 2012
     
    Be easier to move the pipes so you have enough offset to add simple pipe insulation - failing that box them in and then fill the box with crazy foam.

    Most of the pipe loss is to the property anyway

    Regards

    Barney
  2.  
    Thanks both.

    I don't want to move the pipes as this would be a lot of work. The boiler and pipes is next to the back door and in a part of the house we do not use much. The box and foam sounds good though.

    DamonHD Many thanks for the offer. That would be excellent, I am more than happy to provide photographs etc.

    I have attached a photograph of the pipes, the boiler is to the right and there is a wall to the left. There would be sufficient room behind if I remove the pipe clips.

    Can you let me know if you are able to do this?

    Many thanks Dave
      hot_pipes.JPG
    • CommentAuthorowlman
    • CommentTimeFeb 18th 2012
     
    You've hghlighted the problem with most of the readily available pipe clips Dave. They simply are not made with enough offset to allow insulation. Some are available with spacer blocks to add to the basic clip, but most not. I've taken to using brass munsen or ring fittings with a small length of threaded rod to get a decent offset. I does take time though and plumbers generally wont use them. The offset on your pipes will probably be about 10mm and you could insert some thin sheet insulation behind them between the clips and then box in and fill the box with more insulation like glasswool before capping off. Foaming in a Barney suggests is OK until you need to alter things but maybe you dont.
    •  
      CommentAuthorjoe90
    • CommentTimeFeb 19th 2012
     
    When I install multiple pipes as above I fix battens to the wall then screw pipe clips to that, saves drilling/rawplug the wall lots and gives space for insulation.
    • CommentAuthorGaryB
    • CommentTimeFeb 19th 2012
     
    You should be able to get Thermowrap around the lot, keeping the hot and cold pipes separate. I have used it to supplement the insulation on all my heating pipes and it has made quite a difference.

    Use 2 layers if you can.
  3.  
    Thanks for all of the tips. The pipes were installed by the central heating engineer many years ago. I am now trying to retro fit pipe insulation to all of the hot pipes but it is no easy task. I am hoping insulating this lot will make a difference as it is like having a radiator on full tilt in a unused room!

    Cheers Dave
    • CommentAuthoralec
    • CommentTimeFeb 22nd 2012
     
    Best is to insulate the lot but failing that the flows only would be a good compromise as you want the radiators to get the full input of heat and frankly a degree or two on the return won't matter that much...

    all heat is useful with in a building...
    •  
      CommentAuthorDamonHD
    • CommentTimeFeb 22nd 2012
     
    ...in the heating season only...

    Rgds

    Damon
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