I am planning on buying a beauty salon and it needs a boiler in basement. How much is a boiler?

Well, I'm currently in the middle of leasing a store...I am planning on making it a salon. The problem is, I will be a first time business owner and dont know much about prices and stuff. So my question is, How much is a boiler? What size should I get the boiler? Around how much is it to install the boiler? I need estimates...Please Help, give me your opinion! Thanks