i got a new gas boiler put in about just over 2 months ago. since i got it put in it has been lossing pressure very slowly. i have topped it up three times so far. i cant see a leak anywhere. the company who fitted it came back and did a check of all the pipe work downstair and found no leak. there are no marks on the ceiling upstairs so dont think its from there (cant check either as all laminate flooring upstairs). the overflow pipe outside is dry so not that either. it is going from being on 1.5 bars (when heating is off) say 5 weeks ago to now being on .8 of a bar. is this normal? when the heating is turned on it goes back up to about 1 - 1.2 bar but when off drops again. i was told that there is probably a very small leak somewhere but my issue is that i dont want to keep having to top my system up cause from what im reading on here its bad. any ideas of what i can do? the company who fitted it dont seem to care!