Installing a new boiler should always be done by a professional Boiler Installation Cheltenham company like HPR Services because there are many elements that need to be installed correctly and when working with gas you need to be a registered engineer.
When you hire a boiler installation company, they will come to your home with their equipment and take measurements of the size of your home so they know what size the boiler has to be. They will install the boiler where you tell them to, usually on the second floor or above ground if you want to avoid running wires all over your home.

Once the engineer arrives at your home, he will make a detailed list of everything that needs to be done, including any piping or wires that need to be run to the new system. Once the engineer is done with his calculations, he will give you a price for the boiler. He will then install the heating element, which usually takes only a few hours. Once the engineer is finished, you’ll receive a call confirming that your heating system is now running and ready to use.

The first thing that will happen is that the engineers will cut all of the existing wiring that led to your previous heating system. You can then be sure you have a new efficient boiler system.
What to expect on installation day
Before any work begins, an engineer will usually visit to look at where the boiler will go and check the existing set-up, including the number of radiators and bathrooms, the water pressure and the position of the flue. This is the time to agree the best location, discuss payment and set a date.
A straightforward installation is usually finished within a day, though it can take up to two, and longer if a significant refit is needed. You do not have to stay home throughout, as long as you are back when the engineer explains how to use the new boiler. Expect dust sheets over nearby carpets and furnishings, and possibly a power flush afterwards to clear debris from the pipes.
A Gas Safe registered engineer will make sure every part is fitted correctly and safely connected to the gas supply, then tidy up and take away the old boiler. Gas appliances should never be fitted or repaired as a DIY job.