hi mikey, in a word yes, it seems from your post that you are using gas to heat the water, there is a thermocouple in the heater that shuts off the main burner when the water is at running temperature, and the pilot light stays lit (excatly the same as a domestic boiler) question are you using EHU's on site because if you are there is a electric element in the heater that will keep the water at a constant temperature ,
when I arrive on site after setting up and filling the water system I start the heater on gas then after 10/15mins when the water is hot switch on the electric and turn of the gas, to keep the water at the same temp for the rest of our stay, it will do no harm leaving the heater on just using gas if there is no EHU, "ps, dont forget to remove the outside cowl of the heater"
more info on the correct use of the cascade can be found in the pages of this website under ADVICE on the main forum page then scroll down till you see "" how to use the truma ultrastore water heater"" the principal and controls are similar but not exactly the same however ther should some good pointers there for you,
hope this helps