It will cost more to run if you heat the whole house, but if you are getting a modern and smallish unit, AND you have it set up so it has 2 heating "zones" for example "lounge and kitchen only" and "whole house" you could end up saving a little bit if you only use it to heat the lounge and kitchen.
The newer condensing central heaters are much more efficient than your wall furnace was, but if you are heating a larger area, then it will use more gas.
Hope that helps,
Fraser


will decide from there. Thanks in advance Brett & Trudie
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