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You need inspection hatches, its in the manufacturers instructions and haven't heard its changed to CO detectors.
konastab01-
I read about monitoring systems on the gas safe register
I have heard that there could be alternatives to having hatches fitted. Is this true?
Visual examination checks by engineers via inspection hatches is currently the preferred method recommended by the industry guidance that explains how to judge that a flue is working safely and effectively. However, where inspection hatches are not practicable industry has developed a safety system which is able to monitor the void for the presence of carbon monoxide and which cause the boiler to shut down if it is detected.It looks like Baxi do a system but I can't seem to find details beyond this launch release from 2013
Am I right in saying that inspection hatches are only needed at joins in the flue? So if the flue starts in the large cupboard where it is easily visible and then runs straight through the ceiling void/boxed in section to the exterior wall i wouldn't need a hatch?
Trunkie
I think I might have found a better location - in a large coat cupboard under the stairs.
It'd still be on the same internal wall but there is already a boxed in section across the ceiling of the hall and through the toilet opposite. The run would be approx 3m, although I believe it's now possible to use carbon monoxide detectors instead of inspection hatches in the void.
In a worst case scenario I think I could house it in a wall unit on the external wall of the kitchen, so long as I can run the water and gas horizontally from underneath into the corner of the room. I don't want to have to box in the pipes between the underside of the unit and the worktop.