The Burnham LE series boiler is a great boiler. More importantly is the water content of 6.1 gallons. Burnham boasts efficiency of 86.7% at 13.5% CO2 levels. This level is unrealistic because a running efficiency is about 11.5% efficiency without sooting up the heat exchanger. This would put the Efficiency about 84% which is great. We offer this Oil boiler to the home owners who need the assurance of a big brand name. The price is good and the Warranty meets out standard of a lifetime on the heat exchanger. All and all this is a great boiler at a great price. For more information click on this link http://www.Burnham.com Then click on residential and then LE/LEDV