This is why we not only help you with replacing and installing your boiler but we also make it friendly on the old purse strings too regardless of your budget. Oh license# 23376 / ky license# m6981. Sources: bureau of apprenticeship standards position descriptions. The cost of boiler installation can vary significantly depending on how much work is required, the parts, where you live and who you get to do the job. Based in the farnham, aldershot.