Here at Gavin Johnston plumbing & heating we fit new replacement boilers at good prices, fitting a new combi boiler can be a bit complex, you have to take in to account how many people are in the house, if you want to fill a bath or just have a shower and  hot water only. Prices can differ a great deal from one company to another this is due to the fact of what product they are supplying you with, we use (Quality Products) which are more expensive so when we give you a price please bear this in mind. We can provide cheaper boilers but unfortunately with combi boilers you get what you pay for we recommend (Ideal Logic + or Worchester boilers) these boilers come with at least  a 5 years Guarantee parts labour and warranty some are more please ask?