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  1. M

    Boiler losing pressure only when heating is off

    Thats what I thought but it is not. There is no visible damp anywhere. I was told it could be soaking straight down. I isolated the heating for about 6 hours yesterday and then turned the heating off. The pressure in the boiler stayed at 1.5 bar until I opened the valves. It then dropped all...
  2. M

    Boiler losing pressure only when heating is off

    It only rises slightly when on. Now that I have isolated it the pressure has increased slightly. Nearly an hour gone and no loss of pressure at the boiler. I'm guessing this is looking more like it is in the system. If so then wonder if I could use a length of pipe to see if pressure is...
  3. M

    Boiler losing pressure only when heating is off

    I had considered that but thought the drop was too much to be accounted for by contraction, especially as doesn't appear to drop at all throughout the day. I suppose I could see what happens if I leave it on for a couple of days.
  4. M

    Boiler losing pressure only when heating is off

    Hi, Thanks for helping. I have just isolated the boiler and will see what happens over the next couple of hours. I do have a short length, about 5 feet, under concrete. The pipes are Hunter plastic pipes which the plumber told me are obsolete and a plumbers nightmare. If the leak is in the...
  5. M

    Boiler losing pressure only when heating is off

    I have a Baxi Duo-tec 40 Combination Boiler installed in June 16. It loses pressure every night. We top up the pressure to 1.5 bar in the morning and the heating runs fine without a loss of pressure until the heating goes off late in the evening. 1 hour later the pressure has dropped below 1 bar...
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