2013 Western Star 4900 Frac Fluid Heater. 25 million BTU Frac Fluid Heater. Frac Fluid Heater has 1406 engine hours and 150 burn time hours Unit is 95% efficient, burns propane or diesel! Unit is very clean and in mint condition! 16 m3 fuel pup also available. And propane vaporizers available upon request! Please call 780-753-4263 for more info.