It is almost certain that at some point you will need to change your gas or other fossil fuel boiler to a renewable heat generator such as an air source heat pump, whether that is due to regulation, running costs, availability of coal, gas & oil, or because of global pressure to go green. We are already starting to see that governments around the globe, including ours in the UK are penalising users of fossil fuels with higher costs & more legislation, which is a movement that is gathering momentum and showing no signs of stopping, we will cover more on this below.