[Why, is gas less dangerous just across the channel

in reply to this question i have to advise you YES there are differences from country to country....

I have worked in the USA for a few years and concider the larger American WAU of better quality than the average standard systems found in the UK..

However I am interested in the thoughts of UK gas engineers with regards UK warm air units...

How would you grade or compare the general safety between UK - WAU and Wet Ch systems???????