ENERGY SAVING AND THE ENVIRONMENT It has been estimated that 60% of the world’s CO2 is produced by  boilers of one kind or another. This gives the industry a great  opportunity to make a considerable contribution to protecting the  environment. Byworth’s Yorkshireman2 incorporates  a unique X-ID Firetube, which has been  proven to dramatically increase boiler  efficiency. This boiler range is now the first choice for many and have set a  new industry standard. THE YORKSHIREMAN2 Byworth Boilers’ ultimate fuel efficient package