Laird and Son install mid-efficiency and high efficiency boilers. A mid-efficiency boiler has an efficiency rating of 80-85% A.F.U.E. (annual fuel utilization efficiency) A high efficiency boiler has an efficiency rating of 90-95 % A.F.U.E..
The mid-efficiency boilers installed by Laird and Son have cast iron heat exchangers. A cast iron boiler, properly installed, has a proven record of faithful operation and longevity. The units come as chimney vented or direct vent. Direct vent systems are used where chimneys are not available and vent directly through the wall using stainless steel venting. It is imperative that boilers be cleaned annually to prevent premature parts failure and diminished efficiency.
The high efficiency boiler is a condensing system using a cast aluminum or stainless steel heat exchanger. The condensation of exhaust gases releases the latent heat of vaporization of the water. By recovering the heat produced as water vapour , a condensing boiler will regain 970btuh/pound of condensate (the water vapour released whenever one burns fossil fuels). These units vent through CPVC plastic pipes and also require a drain for condensate. Modulating options are available making these units ideal for multipurpose applications. High efficiency boilers also qualify for certain government rebates.
