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  1. L

    air admittance valve

    is there a rquired height for an air admittance valve as the one fitted in my house is only higher than the shower and bath trap and lower than the w.c. and wash basin
  2. L

    worc.240 combi. no hot water without central heating!!!

    i have a worcester 240 combi bf. the only hot water we can get is with the central heating turned on. other than that the water barely gets warm. i have read the manual and believe it could be either the diverter valve, or the diverter valve micro switch. am i right with my theory and is there...