How do they work? the simplest ones are mechanical and use a. It's possible to take the plume away using an additional pipe called a plume management kit. It can take around three years to reach s/nvq level 3, but it can be achieved quicker than this, or it can take longer, it depends on the individual. If you are looking for a company to carry out your emergency boiler repairs, then please call us on 01795 477.