2019 May

UL Approval & Success

We have reason to celebrate! Preferred successfully completed the UL testing of our 1200 HP Ultra-Low NOx Ranger burner at Johnston Boiler. We now have UL listing on the following: API-AF : 50 HP through 600 HP API-RF: 100 HP through 1200 HP Ranger-RF: 100 HP through 1200 HP We also have ULB listings on the entire range […]