The First Fröling T4 Wood Chip Boilers Have Arrived By Travis PaigeSeptember 9, 2015January 10, 2022Commercial Boiler Images, Fröling T4, Fröling T4 Installations, Installations The first Fröling T4 boilers have arrived and are being installed. The T4 is a 500,000 Btu/hr. commercial grade boiler that can burn both wood chips or wood pellets. This installation is at the Sharon Elementary School, located in Sharon, VT.