Radiant Heat Leak?

Discussion in 'Boiler Forum' started by Fraser Jim, Feb 22, 2014.

  1. Fraser Jim

    Fraser Jim New Member

    Nov 23, 2009
    Fraser, CO
    Have a 9-year old radiant heat system in Colorado Mtns. Weekend cabin.

    5-zones of RH in Slab, 2-zones of baseboard, domestic hot water tank.

    Noticed for the last two weeks that the maximum and minimum pressure is down by about a pound per week.

    Have had same symptoms in the past. One was a valve packing slowly leaking, the second was a clogged air valve dripping. This time I can see no visible leaks.

    Looks like I need to get a pro in, but would like to start troubleshooting.

    I can pressurize with auto fill, which is usually off.

    Any suggestions on best way to Isolate which zone(s) might have a leak?

    I was thinking of leaving autofill on when we leave for the week. Would hate to flood the cabin if leak opens, but also burn up boiler if pressure drops to zero.

    Would welcome recommendations.

    Fraser Jim
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Sep 2, 2004
    Retired Systems engineer for defense industry.
    New England
    Most boilers have a low-pressure cutout, which would shut the boiler down if it got too low, but that would also mean no heat, and that could be a big problem if things freeze up. It depends on how things are plumbed and where you have shutoff valves how easy it would be to isolate a leak...hard to tell without being there.
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