Energy Kinetics’ 90+ Resolute Boiler can be chimney vented with 3″ flexible polypropylene for quicker, easier, and less expensive installations than stainless steel liners. The 90+ Resolute is a non-condensing heat and hot water system up to 91 AFUE, and it’s oil or gas fired providing long term fuel flexibility. The 3″ flexible liner is really the Read more