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A significant increase in the use of wood pellets for residential space heating has occurred over the past decade. The performance of two modern residential wood pellet boilers [designated Parishville boiler (PB) and West Potsdam boiler (WPB)] were evaluated, including boiler thermal efficiency, thermal energy storage (TES) tank discharge efficiency, and system efficiency. A correlation applicable to both systems between the boiler thermal efficiency (ηth, %) and the boiler output load (χ, %) was found in the form of ηth = 52.69 ln χ – 137.7, with r2 = 0.79 (for 25 < χ < 75). This equation provides an easy, accurate estimation of the boiler thermal efficiency in field operations. The boiler thermal efficiency decreased with time, and this decline was determined using a Mann–Kendall trend analysis with Sen’s slope. This decrease was primarily the result of fouling in the heat exchanger, and thus, this analysis identifies the need for manual cleaning of the heat exchanger tubes to restore maximal system per...

Performance Evaluation of Two 25 kW Residential Wood Pellet Boiler Heating Systems