i recently installed an old caravan LP Catlytic heater in my trailer. However, it dosent seem to work as good as it did when it was in my old motorhome. I am using a basic LP regulator on a standard 5 gal bottle. Does anyone know what PSI is optimal for these heaters? would it be benefitial to buy an ajustable regulator to be able to adjust the lp pressure? your imput is appreciated. thanks.