All that tells us is that the heating load is not greater than 135,000 btus/hr. It could easily be half that, but without fuel consumption data or an hour meter on the burner it is impossible to estimate.shy0302 wrote:the furnace that is the house has is 135000 BTU it does a good job of heating in the winter.
Does this house have a boiler & radiators or a hot air furnace?