The Argo “AT” Series C Electric Boiler is 100% efficient. The average fuel utilization efficiency (AFUE) of a 15 year old propane or oil-fired boiler is around 82%. If you have a boiler that is 82% efficient, 18% of what you pay for fuel each year goes to waste. In addition to lower heating bills, converting to an Argo “AT” Series C Electric Boiler means no fossil fuel and no chimney. You save on fuel delivery, storage tank (including: tank maintenance, repairs and insurance), and there is no chimney maintenance or repair costs! Once installed, the Argo “AT” does not require any combustion adjustments or heat exchanger and vent pipe cleaning, reducing annual maintenance costs. That all adds up quick and is a lot to consider as a homeowner.