Currently have Oil fired central heating using a standard boiler with cylinder (backed up by an immersion heater)
Mrs wants more space and is pursuing a new combi boiler to replace ours to remove the hot water cylinder to enlarge the bath room marginally!
What do i need to know (nothing atm!!) - efficiency/performance/cost/changes to the current system if any? Is there a secondary way to heat water should the oil run out in bad weather like last year?