How the Seton Boiler is Different;
Most wood burning furnaces and wood boilers on the market today are unable to sustain a temperature of 1100º F or higher. They are built with a firebox made of steel which is surrounded by a jacket of water, "wood stove in a water tank design". This water jacket serves two purposes: it transfers heat from the firebox to the home heating system, and it cools the steel firebox and keeps it from melting. The problem is, by keeping the firebox cool, the water jacket also cools the fire and prevents it from burning at temperatures needed for complete combustion. That's why these units produce irritating smoke and potentially dangerous creosote.
The Seton wood burning boiler is built in an entirely different way. Our firebox is made of high strength ceramic refractory, cast four to six inches thick using a compression casting method, and surrounded by outer layers of insulation designed to keep the heat in. The compression casting makes our refractory stronger than the companies that have copied our boiler design. This has the ability to increase the strength of the firebox as it heats up.
The natural draft system pulls air into the furnace which fans the flames and creates a roaring fire with sustained temperatures of 1800º to 2400º F. Heat from the fire is captured by a water tube heat exchanger located above the firebox in the path of the escaping superheated gases. The pressure vessel extracts the radiant heat from the flames and escaping gases by convection, and not from the combustion process.
This innovative design enables the Seton Boiler wood boiler to burn cleanly and operate at a very high level of efficiency. By the time the escaping gases leave the boiler, they have cooled to around 400º F. The 1700º F difference in temperature between the firebox and the vent represents the amount of energy captured to heat your home. The Seton Wood Boiler burns clean and delivers very close to 86% of the wood's thermal energy to your home heating system.