I have got to replace an old chaffoteaux et maury ( I dont know if I have spelt that right lol) britony flexiflue water heater. Its the one with a grey strip around it with the sight glass in, the control nobs are brown I think and one above the other in the centre it also has a brown pipe cover at the bottom. It has to be a straight swap, be the same size and be able to use the old flue hole. Does anyone know if the newer model of this flexiflue will do that? I have been on hold to technical for over half and hour today to find out and had to hang up in the end as I had too much to do.