Always work with a qualified boiler installer who possesses the necessary skills and technical knowledge. Technical and safety standards must be met at all times. A poorly installed gas boiler could be extremely dangerous in addition to being inefficient. To ensure that the heating engineer is fully insured with public limited liability, request to see their credentials.
The assistance of friends, family, neighbors, and coworkers is also possible. Try to get recommendations from as many people as you can. After that, get three quotes from reputable companies. The work that will be done and what is included in the price should be specified in each quote.