I have a Prochem Cub xl. I am looking to boost the water temp. I was talking to my mechanic. He told me that he could order 120,00 btu from Prochem for 1200.00. Wanted to know if this would be something that is worth doing. I won't be able to afford an upgraded truckmount anytime soon. Is a propane water heater something I can find a deal on used? Thanks for any info!