Fröling P4 Pellet Boiler in Connecticut Zero Energy Challenge Home By Travis PaigeSeptember 5, 2014January 10, 2022Fröling P4, Installations, P4 Pellet Boiler Installations, Stories The third place winner of the 2010 Connecticut Zero Energy Challenge has the Fröling P4 32/38 installed as its main heat source.Project datasheet link here. Please leave this field empty WANT MORE? SIGN UP TO RECEIVE THE LATEST TARM BIOMASS BLOG POSTS. Email Address * We don’t spam! Read our privacy policy for more info. Check your inbox or spam folder to confirm your subscription.