A Saniflo (also known as macerator pump) a is a needed component in your toilet, used to help break down waste in the toilet making it easier to travel through the pipes minimising the chances of pipes being blocked.
The obvious answer is to have your boiler serviced regularly, this will help prevent the chances of your boiler failing when you most need it. This gives you a variety of benefits such as small parts being repaired instead of large one off costs and ensures the safety of you gas boiler.