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My sealed heating system is losing water but no apparent leaks?

Hi! My sealed central heating system loses one bar water pressure in two days. I have concrete floors with pipework under but no evidence of any leak. The plumber suggests Radweld or Leakfix but that seems a bit of a bodge. This has been going on since Christmas! Any suggestions how I might be able to locate the problem guys? Many thanks.

Grandadboilersuit
March 2010
Heating, Home Heating SystemsHeating Losing Leaks

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Central Heating Losing Pressure - No Leak?