The already several times mentioned phenomenon that already than half turned up regulator is no longer heat increase at slightly less, in my opinion, is because in the entire model series, the same controller is installed and the "fully opens" already at half revolution. Due to the principle is the heat radiation of the Polo 2.0 of max. 6 KW of course can not be compared with a 14 KW Fume Extraction. Nevertheless, I managed to raise the heat output of the Polo 2.0. I have the mitglieferten gas pressure regulator with fixed gas pressure of 50 mbar to a controllable 70-200 mbar (but it costs 39, - Euro on the Internet) exchanged. This has the same hose connection, including 1/4 in. I run the Polo now with 70 mbar and the heat has gone up significantly. Then, although a 11 Kg bottle keeps just not 50 hrs. But just only 42 hrs. Or so., So what?
Under no circumstances should you operate the heater with even "greater" pressure reducing valves, for example. 0,5 - 3,5 bar. Here, first fit the connection not because instead of 1/4 inch now 3/8 (DIY adapter is far as I know not allowed) and also does not work, because then you either have an infernal machine, when the flames hit out of the basket, or the flame from the torch lifts and then goes completely out.
Mike