Set up an appointment with one of our technicians! call today! To beat any like for like quote from national gas companies, therefore you are guaranteed the highest standard of workmanship at the lowest feasible price. Which supermarket is cheapest? Will involve a bit more work, including possibly a new flue and changes to the pipework, so this will probably cost. Great group here , fast and reliable ! Propane boilers operate nearly identically to natural gas boilers propane is.